Diff of the two buildlogs:

--
--- b1/build.log	2025-03-24 15:57:10.212538388 +0000
+++ b2/build.log	2025-03-24 16:00:55.238458061 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Mar 24 03:54:19 -12 2025
-I: pbuilder-time-stamp: 1742831659
+I: Current time: Mon Apr 27 12:20:13 +14 2026
+I: pbuilder-time-stamp: 1777242013
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -24,52 +24,84 @@
 dpkg-source: info: applying concurrent-web-server-connection-refused.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2360382/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink03-arm64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 Apr 26 22:20 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_LOADABLES_PATH=/usr/local/lib/bash:/usr/lib/bash:/opt/local/lib/bash:/usr/pkg/lib/bash:/opt/pkg/lib/bash:.
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="2" [2]="37" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.37(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='37087abea88047c1a93ec2d7c639deea'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='2360382'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=990f12f36406485cb088f336c328fbc6
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=1826331
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.4fFrcxus/pbuilderrc_14Mc --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.4fFrcxus/b1 --logfile b1/build.log guile-fibers_1.3.1-5.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.4:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.4fFrcxus/pbuilderrc_ADGR --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.4fFrcxus/b2 --logfile b2/build.log guile-fibers_1.3.1-5.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink04-arm64 6.1.0-32-cloud-arm64 #1 SMP Debian 6.1.129-1 (2025-03-06) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-32-cloud-arm64 #1 SMP Debian 6.1.129-1 (2025-03-06) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2360382/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -170,7 +202,7 @@
 Get: 59 http://deb.debian.org/debian trixie/main arm64 tex-common all 6.19 [29.4 kB]
 Get: 60 http://deb.debian.org/debian trixie/main arm64 texinfo-lib arm64 7.1.1-1+b1 [220 kB]
 Get: 61 http://deb.debian.org/debian trixie/main arm64 texinfo all 7.1.1-1 [1753 kB]
-Fetched 33.7 MB in 0s (166 MB/s)
+Fetched 33.7 MB in 1s (62.2 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libproc2-0:arm64.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19899 files and directories currently installed.)
@@ -445,7 +477,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/guile-fibers-1.3.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../guile-fibers_1.3.1-5_source.changes
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/guile-fibers-1.3.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../guile-fibers_1.3.1-5_source.changes
 dpkg-buildpackage: info: source package guile-fibers
 dpkg-buildpackage: info: source version 1.3.1-5
 dpkg-buildpackage: info: source distribution unstable
@@ -589,24 +625,24 @@
 	cd b4deb && make -j12
 make[1]: Entering directory '/build/reproducible-path/guile-fibers-1.3.1/b4deb'
 mkdir -p fibers
-mkdir -p /build/reproducible-path/guile-fibers-1.3.1/b4deb/override/fibers
 sed -e "s|@extlibdir\@|/usr/lib/aarch64-linux-gnu/guile/3.0/extensions|" \
     ../fibers/config.scm.in > fibers/config.scm
 mkdir -p /build/reproducible-path/guile-fibers-1.3.1/b4deb/override/fibers
-cp -f /build/reproducible-path/guile-fibers-1.3.1/b4deb/../fibers/posix-clocks-generic.scm /build/reproducible-path/guile-fibers-1.3.1/b4deb/override/fibers/posix-clocks.scm
 cp -f /build/reproducible-path/guile-fibers-1.3.1/b4deb/../fibers/epoll.scm /build/reproducible-path/guile-fibers-1.3.1/b4deb/override/fibers/events-impl.scm
+mkdir -p /build/reproducible-path/guile-fibers-1.3.1/b4deb/override/fibers
+cp -f /build/reproducible-path/guile-fibers-1.3.1/b4deb/../fibers/posix-clocks-generic.scm /build/reproducible-path/guile-fibers-1.3.1/b4deb/override/fibers/posix-clocks.scm
 make  all-am
 make[2]: Entering directory '/build/reproducible-path/guile-fibers-1.3.1/b4deb'
 restore=: && backupdir=".am$$" && \
 am__cwd=`pwd` && CDPATH="${ZSH_VERSION+.}:" && cd .. && \
 rm -rf $backupdir && mkdir $backupdir && \
-if (/bin/bash '/build/reproducible-path/guile-fibers-1.3.1/build-aux/missing' makeinfo --version) >/dev/null 2>&1; then \
+if (/bin/sh '/build/reproducible-path/guile-fibers-1.3.1/build-aux/missing' makeinfo --version) >/dev/null 2>&1; then \
   for f in ../fibers.info ../fibers.info-[0-9] ../fibers.info-[0-9][0-9] ../fibers.i[0-9] ../fibers.i[0-9][0-9]; do \
     if test -f $f; then mv $f $backupdir; restore=mv; else :; fi; \
   done; \
 else :; fi && \
 cd "$am__cwd"; \
-if /bin/bash '/build/reproducible-path/guile-fibers-1.3.1/build-aux/missing' makeinfo   -I .. \
+if /bin/sh '/build/reproducible-path/guile-fibers-1.3.1/build-aux/missing' makeinfo   -I .. \
  -o ../fibers.info ../fibers.texi; \
 then \
   rc=0; \
@@ -623,14 +659,14 @@
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "override/fibers/posix-clocks.go" "override/fibers/posix-clocks.scm"
-/bin/bash ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I.. -Wall -Werror  -I/usr/include/guile/3.0  -I../extensions -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/guile-fibers-1.3.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -c -o extensions/fibers_epoll_la-epoll.lo `test -f 'extensions/epoll.c' || echo '../'`extensions/epoll.c
+/bin/sh ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I.. -Wall -Werror  -I/usr/include/guile/3.0  -I../extensions -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/guile-fibers-1.3.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -c -o extensions/fibers_epoll_la-epoll.lo `test -f 'extensions/epoll.c' || echo '../'`extensions/epoll.c
 libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -Wdate-time -D_FORTIFY_SOURCE=2 -I.. -Wall -Werror -I/usr/include/guile/3.0 -I../extensions -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/guile-fibers-1.3.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -c ../extensions/epoll.c  -fPIC -DPIC -o extensions/.libs/fibers_epoll_la-epoll.o
-/bin/bash ./libtool  --tag=CC   --mode=link gcc -I.. -Wall -Werror  -I/usr/include/guile/3.0  -I../extensions -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/guile-fibers-1.3.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -export-dynamic -module -Wl,-z,relro -Wl,-z,now -o fibers-epoll.la -rpath /usr/lib/aarch64-linux-gnu/guile/3.0/extensions extensions/fibers_epoll_la-epoll.lo -lguile-3.0 -lgc -lpthread -ldl   
+/bin/sh ./libtool  --tag=CC   --mode=link gcc -I.. -Wall -Werror  -I/usr/include/guile/3.0  -I../extensions -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/guile-fibers-1.3.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -export-dynamic -module -Wl,-z,relro -Wl,-z,now -o fibers-epoll.la -rpath /usr/lib/aarch64-linux-gnu/guile/3.0/extensions extensions/fibers_epoll_la-epoll.lo -lguile-3.0 -lgc -lpthread -ldl   
+wrote `override/fibers/posix-clocks.go'
 ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /usr/bin/guild-3.0
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/usr/bin/guild-3.0.go
-wrote `override/fibers/posix-clocks.go'
 libtool: link: gcc -shared  -fPIC -DPIC  extensions/.libs/fibers_epoll_la-epoll.o   -lguile-3.0 -lgc -lpthread -ldl  -Werror -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/guile-fibers-1.3.1=. -fstack-protector-strong -Werror=format-security -mbranch-protection=standard -Wl,-z -Wl,relro -Wl,-z -Wl,now   -Wl,-soname -Wl,fibers-epoll.so.0 -o .libs/fibers-epoll.so.0.0.0
 libtool: link: (cd ".libs" && rm -f "fibers-epoll.so.0" && ln -s "fibers-epoll.so.0.0.0" "fibers-epoll.so.0")
 libtool: link: (cd ".libs" && rm -f "fibers-epoll.so" && ln -s "fibers-epoll.so.0.0.0" "fibers-epoll.so")
@@ -668,11 +704,11 @@
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/operations.go" "../fibers/operations.scm"
-wrote `fibers/config.go'
+wrote `fibers/affinity.go'
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/psq.go" "../fibers/psq.scm"
-wrote `fibers/affinity.go'
+wrote `fibers/config.go'
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/repl.go" "../fibers/repl.scm"
@@ -701,10 +737,10 @@
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/scheduler.go" "../fibers/scheduler.scm"
 wrote `fibers/nameset.go'
-wrote `fibers/counter.go'
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/stack.go" "../fibers/stack.scm"
+wrote `fibers/counter.go'
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/timers.go" "../fibers/timers.scm"
@@ -712,23 +748,23 @@
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/timer-wheel.go" "../fibers/timer-wheel.scm"
-wrote `fibers/deque.go'
+wrote `fibers/conditions.go'
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "fibers/web/server.go" "../fibers/web/server.scm"
-wrote `fibers/io-wakeup.go'
+wrote `fibers/deque.go'
 ./env	\
   /usr/bin/guild-3.0 compile  -L "/build/reproducible-path/guile-fibers-1.3.1/b4deb/.."	\
   -Wunbound-variable -Warity-mismatch -Wformat -o "web/server/fibers.go" "../web/server/fibers.scm"
+wrote `fibers/io-wakeup.go'
 wrote `fibers.go'
-wrote `fibers/conditions.go'
-wrote `fibers/channels.go'
 wrote `fibers/operations.go'
+wrote `fibers/repl.go'
 wrote `fibers/stack.go'
+wrote `fibers/channels.go'
+wrote `fibers/psq.go'
 wrote `fibers/timers.go'
-wrote `fibers/repl.go'
 wrote `web/server/fibers.go'
-wrote `fibers/psq.go'
 wrote `fibers/web/server.go'
 wrote `fibers/scheduler.go'
 wrote `fibers/timer-wheel.go'
@@ -744,162 +780,162 @@
 assert #f equal to #f: ok
 assert #t terminates: ok
 assert (false-if-exception (begin (run-fibers) #t)) equal to #f: ok
-assert terminates: (run-fibers (lambda () (sleep 1)) #:drain? #t): ok (1.220324138 s)
-assert terminates: (run-fibers (lambda () (do-times 1 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.199497266 s)
-assert terminates: (run-fibers (lambda () (do-times 10 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.247843523 s)
-assert terminates: (run-fibers (lambda () (do-times 100 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.162258797 s)
-assert terminates: (run-fibers (lambda () (do-times 1000 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.173004983 s)
-assert terminates: (run-fibers (lambda () (do-times 10000 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.451877096 s)
-assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.423871925 s)
-assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber (lambda () #t) #:parallel? #t))) #:drain? #t): ok (0.50285453 s)
-assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber loop-to-1e4))) #:drain? #t): ok (2.144725859 s)
-assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber loop-to-1e4 #:parallel? #t))) #:drain? #t): ok (0.579738043 s)
-assert terminates: (run-fibers (lambda () (do-times 1 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.247759787 s)
-assert terminates: (run-fibers (lambda () (do-times 10 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.15063395 s)
-assert terminates: (run-fibers (lambda () (do-times 100 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.114943771 s)
-assert terminates: (run-fibers (lambda () (do-times 1000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.165771243 s)
-assert terminates: (run-fibers (lambda () (do-times 10000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.355936251 s)
-assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.624750264 s)
-assert terminates: (run-fibers (lambda () (do-times 1000000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (5.697158767 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-tree 7 (lambda () (sleep 1)))) #:drain? #t): ok (1.18154706 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 5)) #:drain? #t): ok (0.172152177 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 50)) #:drain? #t): ok (0.175606679 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 500)) #:drain? #t): ok (0.152078775 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 5000)) #:drain? #t): ok (0.199689547 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 50000)) #:drain? #t): ok (0.286257479 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 500000)) #:drain? #t): ok (1.38823661 s)
-assert terminates: (run-fibers (lambda () (spawn-fiber-chain 5000000)) #:drain? #t): ok (12.092834027 s)
-assert terminates: (run-fibers (lambda () (test-run-order 10)) #:parallelism 1 #:drain? #t): ok (0.055934304 s)
-assert terminates: (run-fibers (lambda () (test-wakeup-order 10)) #:parallelism 1 #:drain? #t): ok (0.003707743 s)
-assert terminates: (run-fibers (lambda () 1) #:drain? #t): ok (0.111746607 s)
+assert terminates: (run-fibers (lambda () (sleep 1)) #:drain? #t): ok (1.27216648 s)
+assert terminates: (run-fibers (lambda () (do-times 1 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.2401726 s)
+assert terminates: (run-fibers (lambda () (do-times 10 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.2716044 s)
+assert terminates: (run-fibers (lambda () (do-times 100 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.2438186 s)
+assert terminates: (run-fibers (lambda () (do-times 1000 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.2237936 s)
+assert terminates: (run-fibers (lambda () (do-times 10000 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.26356032 s)
+assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber (lambda () #t)))) #:drain? #t): ok (0.72372952 s)
+assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber (lambda () #t) #:parallel? #t))) #:drain? #t): ok (0.56372888 s)
+assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber loop-to-1e4))) #:drain? #t): ok (2.68775284 s)
+assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber loop-to-1e4 #:parallel? #t))) #:drain? #t): ok (0.76377184 s)
+assert terminates: (run-fibers (lambda () (do-times 1 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.32790544 s)
+assert terminates: (run-fibers (lambda () (do-times 10 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.24777024 s)
+assert terminates: (run-fibers (lambda () (do-times 100 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.26783064 s)
+assert terminates: (run-fibers (lambda () (do-times 1000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.27177088 s)
+assert terminates: (run-fibers (lambda () (do-times 10000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (1.55166228 s)
+assert terminates: (run-fibers (lambda () (do-times 100000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (2.0038076 s)
+assert terminates: (run-fibers (lambda () (do-times 1000000 (spawn-fiber (lambda () (sleep 1))))) #:drain? #t): ok (9.0957328 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-tree 7 (lambda () (sleep 1)))) #:drain? #t): ok (1.29185144 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 5)) #:drain? #t): ok (0.22775748 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 50)) #:drain? #t): ok (0.17969616 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 500)) #:drain? #t): ok (0.21980324 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 5000)) #:drain? #t): ok (0.23623268 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 50000)) #:drain? #t): ok (0.47524712 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 500000)) #:drain? #t): ok (2.95976588 s)
+assert terminates: (run-fibers (lambda () (spawn-fiber-chain 5000000)) #:drain? #t): ok (12.81785288 s)
+assert terminates: (run-fibers (lambda () (test-run-order 10)) #:parallelism 1 #:drain? #t): ok (0.0121502 s)
+assert terminates: (run-fibers (lambda () (test-wakeup-order 10)) #:parallelism 1 #:drain? #t): ok (5.37e-4 s)
+assert terminates: (run-fibers (lambda () 1) #:drain? #t): ok (0.00589656 s)
 assert run-fiber-return-vals equal to (1): ok
-assert terminates: (run-fibers (lambda () (do-times 20 (check-sleep (random 1.0)))) #:drain? #t): ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+assert terminates: (run-fibers (lambda () (do-times 20 (check-sleep (random 1.0)))) #:drain? #t): assert sleep 0.054286912934443515s < actual 0.05481724s: #t (diff: 0.9768967084146174%)
+assert sleep 0.09653058217709773s < actual 0.09678652s: #t (diff: 0.2651365164593342%)
+assert sleep 0.2036024266810931s < actual 0.21121804s: #t (diff: 3.7404334727480406%)
+assert sleep 0.34846261042674526s < actual 0.35123736s: #t (diff: 0.7962832999088886%)
+assert sleep 0.3942733519946393s < actual 0.39522996s: #t (diff: 0.24262557956838235%)
+assert sleep 0.43935368923182283s < actual 0.44098536s: #t (diff: 0.37137978083899037%)
+assert sleep 0.4419453002982058s < actual 0.44225132s: #t (diff: 0.06924379591495498%)
+assert sleep 0.49721637048991s < actual 0.49732808s: #t (diff: 0.022466981523540274%)
+assert sleep 0.5407140907887908s < actual 0.54088664s: #t (diff: 0.03191135835898297%)
+assert sleep 0.6605585525975679s < actual 0.6609084s: #t (diff: 0.052962360574443104%)
+assert sleep 0.6733174449225591s < actual 0.673499s: #t (diff: 0.02696426162874309%)
+assert sleep 0.7003152109158738s < actual 0.70074332s: #t (diff: 0.0611309132592277%)
+assert sleep 0.7301743581471626s < actual 0.73062552s: #t (diff: 0.06178823561844607%)
+assert sleep 0.7398350214633127s < actual 0.74007352s: #t (diff: 0.03223671896683305%)
+assert sleep 0.7506666215852518s < actual 0.75109908s: #t (diff: 0.057609916614514964%)
+assert sleep 0.780725107864058s < actual 0.78097264s: #t (diff: 0.031705415062054806%)
+assert sleep 0.7941978171305586s < actual 0.79460216s: #t (diff: 0.050912110398672134%)
+assert sleep 0.8264597640641722s < actual 0.82658548s: #t (diff: 0.01521138006883217%)
+assert sleep 0.8916210235705617s < actual 0.89211936s: #t (diff: 0.05589105867453434%)
+assert sleep 0.9713002094201767s < actual 0.97183924s: #t (diff: 0.05549577510593494%)
+ok (0.99207816 s)
+;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/basic.scm
 WARNING: (tests basic): imported module (fibers) overrides core binding `sleep'
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/basic.scm.go
 WARNING: (tests basic): imported module (fibers) overrides core binding `sleep'
-assert sleep 0.024869744140937303s < actual 0.026242401s: #t (diff: 5.519384724200716%)
-assert sleep 0.05190218899823896s < actual 0.052688164s: #t (diff: 1.5143388302711318%)
-assert sleep 0.06230931160657266s < actual 0.064703318s: #t (diff: 3.842132631063775%)
-assert sleep 0.11880574403313444s < actual 0.120691102s: #t (diff: 1.5869249270807406%)
-assert sleep 0.2606627789498001s < actual 0.260898963s: #t (diff: 0.09060904328245425%)
-assert sleep 0.2673394552296189s < actual 0.272270673s: #t (diff: 1.8445529359464332%)
-assert sleep 0.2899369310917357s < actual 0.292680839s: #t (diff: 0.9463809587596737%)
-assert sleep 0.29310693200006604s < actual 0.293385963s: #t (diff: 0.09519768025613244%)
-assert sleep 0.2934838551523557s < actual 0.293921806s: #t (diff: 0.1492248517101412%)
-assert sleep 0.357478762512242s < actual 0.360721297s: #t (diff: 0.9070565381200731%)
-assert sleep 0.3873707023621553s < actual 0.388690829s: #t (diff: 0.34079155439342024%)
-assert sleep 0.4336257477895825s < actual 0.436703924s: #t (diff: 0.7098693345837005%)
-assert sleep 0.4567640342315482s < actual 0.456983288s: #t (diff: 0.0480015395302841%)
-assert sleep 0.47751651120863536s < actual 0.478589021s: #t (diff: 0.2246016140154034%)
-assert sleep 0.5132483764237162s < actual 0.516753735s: #t (diff: 0.6829750930161502%)
-assert sleep 0.5533201490382416s < actual 0.556702301s: #t (diff: 0.6112468464481391%)
-assert sleep 0.8269573539515185s < actual 0.828700293s: #t (diff: 0.2107652879744187%)
-assert sleep 0.8278778710734596s < actual 0.828842453s: #t (diff: 0.11651258721165718%)
-assert sleep 0.9526730873636382s < actual 0.952949816s: #t (diff: 0.029047596707863835%)
-assert sleep 0.9569662357874273s < actual 0.957151682s: #t (diff: 0.019378553353041516%)
-ok (1.095638373 s)
 PASS: tests/basic.scm
 assert (condition? cv) equal to #t: ok
-assert run-fibers on (wait/timeout cv) terminates: ok (0.264413305 s)
+assert run-fibers on (wait/timeout cv) terminates: ok (0.06582952 s)
 assert run-fiber-return-vals equal to (#f): ok
-assert run-fibers on (wait/timeout cv) terminates: ok (0.163866407 s)
+assert run-fibers on (wait/timeout cv) terminates: ok (0.06847664 s)
 assert run-fiber-return-vals equal to (#f): ok
 assert (signal-condition! cv) equal to #t: ok
 assert (signal-condition! cv) equal to #f: ok
-assert run-fibers on (wait/timeout cv) terminates: ok (0.251637826 s)
+assert run-fibers on (wait/timeout cv) terminates: ok (0.02704504 s)
 assert run-fiber-return-vals equal to (#t): ok
-assert run-fibers on (wait/timeout cv) terminates: ok (0.17578084 s)
+assert run-fibers on (wait/timeout cv) terminates: ok (0.02253312 s)
 assert run-fiber-return-vals equal to (#t): ok
-assert run-fibers on (let ((cv (make-condition))) (spawn-fiber (lambda () (signal-condition! cv))) (wait cv) #t) terminates: ok (0.299821122 s)
+assert run-fibers on (let ((cv (make-condition))) (spawn-fiber (lambda () (signal-condition! cv))) (wait cv) #t) terminates: ok (0.08770756 s)
 assert run-fiber-return-vals equal to (#t): ok
-assert (let ((cv (make-condition))) (run-fibers (lambda () (spawn-fiber (lambda () (wait cv))) (yield-current-task)) #:drain? #f #:hz 0 #:parallelism 1) (signal-condition! cv)) equal to #t: ok
-;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+assert (let ((cv (make-condition))) (run-fibers (lambda () (spawn-fiber (lambda () (wait cv))) (yield-current-task)) #:drain? #f #:hz 0 #:parallelism 1) (signal-condition! cv)) equal to #t: ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/conditions.scm
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/conditions.scm.go
+ok
 PASS: tests/conditions.scm
-assert run-fibers on (rpc 1) terminates: ok (0.236986056 s)
+assert run-fibers on (rpc 1) terminates: ok (0.03336588 s)
 assert run-fiber-return-vals equal to (1): ok
-assert run-fibers on (rpc-fib 24) terminates: ok (2.175775969 s)
+assert run-fibers on (rpc-fib 24) terminates: ok (1.46341476 s)
 assert run-fiber-return-vals equal to (75025): ok
-assert run-fibers on (pingpong (current-processor-count) 1000) terminates: ok (4.951668747 s)
-;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+assert run-fibers on (pingpong (current-processor-count) 1000) terminates: ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/channels.scm
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/channels.scm.go
+ok (0.05640836 s)
 PASS: tests/channels.scm
 assert #f equal to #f: ok
 assert #t terminates: ok
 assert (sleep 1) terminates: ok
 assert (perform-operation (sleep-operation 1)) terminates: ok
 assert (receive-from-fiber 42) equal to 42: ok
-assert (send-to-fiber 42) equal to 42: ok
-;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+assert (send-to-fiber 42) equal to 42: ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/foreign.scm
 WARNING: (tests foreign): imported module (fibers) overrides core binding `sleep'
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/foreign.scm.go
 WARNING: (tests foreign): imported module (fibers) overrides core binding `sleep'
+ok
 PASS: tests/foreign.scm
-assert run-fibers on (readable/timeout? s) terminates: ok (0.26846509 s)
+assert run-fibers on (readable/timeout? s) terminates: ok (0.0839878 s)
 assert run-fiber-return-vals equal to (#t): ok
 assert (readable/timeout? s) equal to #t: ok
-assert run-fibers on (readable/timeout? A) terminates: ok (0.216141528 s)
+assert run-fibers on (readable/timeout? A) terminates: ok (0.0895422 s)
 assert run-fiber-return-vals equal to (#t): ok
 assert (readable/timeout? A) equal to #t: ok
-assert run-fibers on (writable/timeout? B) terminates: ok (0.105168606 s)
+assert run-fibers on (writable/timeout? B) terminates: ok (0.07368572 s)
 assert run-fiber-return-vals equal to (#f): ok
 assert (writable/timeout? B) equal to #f: ok
-assert run-fibers on (writable/timeout? B) terminates: ok (0.278885674 s)
+assert run-fibers on (writable/timeout? B) terminates: ok (0.06616336 s)
 assert run-fiber-return-vals equal to (#t): ok
-assert run-fibers on (readable/timeout? A) terminates: ok (0.25710602 s)
-assert run-fiber-return-vals equal to (#f): ok
-;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+assert run-fibers on (readable/timeout? A) terminates: ok (0.00563444 s)
+assert run-fiber-return-vals equal to (#f): ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/io-wakeup.scm
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/io-wakeup.scm.go
+ok
 PASS: tests/io-wakeup.scm
-assert run-fibers on (my-param) terminates: ok (0.146904863 s)
+assert run-fibers on (my-param) terminates: ok (0.02542112 s)
 assert run-fiber-return-vals equal to (#f): ok
-assert run-fibers on (rpc (my-param)) terminates: ok (0.199778548 s)
+assert run-fibers on (rpc (my-param)) terminates: ok (0.05984428 s)
 assert run-fiber-return-vals equal to (#f): ok
-assert run-fibers on (rpc (begin (my-param 42) (my-param))) terminates: ok (0.159869302 s)
+assert run-fibers on (rpc (begin (my-param 42) (my-param))) terminates: ok (0.04379176 s)
 assert run-fiber-return-vals equal to (42): ok
-assert run-fibers on (my-param) terminates: ok (0.143881244 s)
+assert run-fibers on (my-param) terminates: ok (0.00728604 s)
 assert run-fiber-return-vals equal to (#f): ok
-assert run-fibers on (begin (my-param 100) (rpc (my-param))) terminates: ok (0.127654185 s)
+assert run-fibers on (begin (my-param 100) (rpc (my-param))) terminates: ok (0.00596248 s)
 assert run-fiber-return-vals equal to (100): ok
-assert run-fibers on (my-param) terminates: ok (0.16760455 s)
+assert run-fibers on (my-param) terminates: ok (0.00664608 s)
 assert run-fiber-return-vals equal to (#f): ok
 assert (my-param) equal to #f: ok
 assert (begin (my-param (quote foo)) (my-param)) equal to foo: ok
-assert run-fibers on (my-param) terminates: ok (0.195400881 s)
+assert run-fibers on (my-param) terminates: ok (0.10190568 s)
 assert run-fiber-return-vals equal to (foo): ok
-assert run-fibers on (rpc (my-param)) terminates: ok (0.275813495 s)
+assert run-fibers on (rpc (my-param)) terminates: ok (0.00608772 s)
 assert run-fiber-return-vals equal to (foo): ok
 ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/parameters.scm
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/parameters.scm.go
 PASS: tests/parameters.scm
-assert run-fibers on (let lp ((n 0)) (when (< n 100000000) (lp (#{1+}# n)))) terminates: ok (0.394936267 s)
-assert run-fibers on (race-until 100) terminates: ok (2.531772398 s)
-assert run-fiber-return-vals equal to (100): ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+assert run-fibers on (let lp ((n 0)) (when (< n 100000000) (lp (#{1+}# n)))) terminates: ok (0.28621008 s)
+assert run-fibers on (race-until 100) terminates: ok (2.39962152 s)
+assert run-fiber-return-vals equal to (100): ok
+;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/preemption.scm
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/preemption.scm.go
-ok
 PASS: tests/preemption.scm
-speedup for (do-times 100000 (spawn-fiber (lambda () #t) #:parallel? #t)): 0.225238825 s / 0.725649379 s = 0.3103962209826407x (12 cpus)
-speedup for (do-times 40000 (spawn-fiber (lambda () (sleep 1)) #:parallel? #t)): 1.197361158 s / 1.358200826 s = 0.8815788763185453x (12 cpus)
-speedup for (do-times 100000 (spawn-fiber (lambda () (loop-to 10000)) #:parallel? #t)): 2.212010952 s / 0.543831462 s = 4.06745675188612x (12 cpus)
-speedup for (do-times 10000 (spawn-fiber (lambda () (loop-to 100000)) #:parallel? #t)): 2.100486988 s / 0.307302208 s = 6.835248603225136x (12 cpus)
-speedup for (do-times 1000 (spawn-fiber (lambda () (loop-to 1000000)) #:parallel? #t)): 2.1026768 s / 0.360982818 s = 5.824866711523095x (12 cpus)
-speedup for (do-times 100000 (spawn-fiber (lambda () (alloc-to 4 1000)) #:parallel? #t)): 4.543672361 s / 7.632059978 s = 0.5953402324008832x (12 cpus)
-speedup for (do-times 10000 (spawn-fiber (lambda () (alloc-to 4 10000)) #:parallel? #t)): 4.168395095 s / 7.279287371 s = 0.5726377985304574x (12 cpus)
-speedup for (do-times 1000 (spawn-fiber (lambda () (alloc-to 4 100000)) #:parallel? #t)): 3.887553609 s / 7.540243695 s = 0.5155740008214681x (12 cpus)
+speedup for (do-times 100000 (spawn-fiber (lambda () #t) #:parallel? #t)): 0.3059636 s / 0.47923008 s = 0.6384482376398409x (12 cpus)
+speedup for (do-times 40000 (spawn-fiber (lambda () (sleep 1)) #:parallel? #t)): 1.21282088 s / 1.32223168 s = 0.9172529280193922x (12 cpus)
+speedup for (do-times 100000 (spawn-fiber (lambda () (loop-to 10000)) #:parallel? #t)): 2.19785488 s / 0.2735086 s = 8.035779789008462x (12 cpus)
+speedup for (do-times 10000 (spawn-fiber (lambda () (loop-to 100000)) #:parallel? #t)): 2.10568328 s / 0.25107688 s = 8.386607639859154x (12 cpus)
+speedup for (do-times 1000 (spawn-fiber (lambda () (loop-to 1000000)) #:parallel? #t)): 2.121779 s / 0.24106724 s = 8.801606555913612x (12 cpus)
+speedup for (do-times 100000 (spawn-fiber (lambda () (alloc-to 4 1000)) #:parallel? #t)): 6.07983772 s / 6.35925956 s = 0.9560606329457638x (12 cpus)
+speedup for (do-times 10000 (spawn-fiber (lambda () (alloc-to 4 10000)) #:parallel? #t)): 3.78152212 s / 6.22281804 s = 0.6076864365457165x (12 cpus)
+speedup for (do-times 1000 (spawn-fiber (lambda () (alloc-to 4 100000)) #:parallel? #t)): 5.64995148 s / 5.46554484 s = 1.033739845779035x (12 cpus)
 ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
 ;;;       or pass the --no-auto-compile argument to disable.
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/speedup.scm
@@ -912,6 +948,13 @@
 ;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/timer-wheel.scm
 ;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/timer-wheel.scm.go
 PASS: tests/timer-wheel.scm
+;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
+;;;       or pass the --no-auto-compile argument to disable.
+;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/ports.scm
+WARNING: (tests ports): imported module (fibers) overrides core binding `sleep'
+;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/ports.scm.go
+WARNING: (tests ports): imported module (fibers) overrides core binding `sleep'
+success
 
 ;;; (listening-socket #<input-output: socket 12>)
 
@@ -925,20 +968,13 @@
 
 ;;; (listening-socket #<input-output: socket 13>)
 
-;;; (accepted-connection (#<input-output: socket 14> . #(2 2130706433 33268)))
+;;; (accepted-connection (#<input-output: socket 14> . #(2 2130706433 59134)))
 
 ;;; (connected #(2 2130706433 5556))
 
 ;;; (received "hello!")
 
 ;;; (echo "hello!")
-;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
-;;;       or pass the --no-auto-compile argument to disable.
-;;; compiling /build/reproducible-path/guile-fibers-1.3.1/b4deb/../tests/ports.scm
-WARNING: (tests ports): imported module (fibers) overrides core binding `sleep'
-;;; compiled /build/reproducible-path/guile-fibers-1.3.1/debian/.debhelper/generated/_source/home/.cache/guile/ccache/3.0-LE-8-4.7/build/reproducible-path/guile-fibers-1.3.1/tests/ports.scm.go
-WARNING: (tests ports): imported module (fibers) overrides core binding `sleep'
-success
 PASS: tests/ports.scm
 assert (length data) equal to 10000: ok
 assert (length data) equal to 10000: ok
@@ -966,7 +1002,7 @@
 make[4]: Entering directory '/build/reproducible-path/guile-fibers-1.3.1/b4deb'
 make[4]: Nothing to be done for 'install-exec-am'.
  /usr/bin/mkdir -p '/build/reproducible-path/guile-fibers-1.3.1/debian/tmp/usr/lib/aarch64-linux-gnu/guile/3.0/extensions'
- /bin/bash ./libtool   --mode=install /usr/bin/install -c   fibers-epoll.la '/build/reproducible-path/guile-fibers-1.3.1/debian/tmp/usr/lib/aarch64-linux-gnu/guile/3.0/extensions'
+ /bin/sh ./libtool   --mode=install /usr/bin/install -c   fibers-epoll.la '/build/reproducible-path/guile-fibers-1.3.1/debian/tmp/usr/lib/aarch64-linux-gnu/guile/3.0/extensions'
 libtool: install: /usr/bin/install -c .libs/fibers-epoll.so.0.0.0 /build/reproducible-path/guile-fibers-1.3.1/debian/tmp/usr/lib/aarch64-linux-gnu/guile/3.0/extensions/fibers-epoll.so.0.0.0
 libtool: install: (cd /build/reproducible-path/guile-fibers-1.3.1/debian/tmp/usr/lib/aarch64-linux-gnu/guile/3.0/extensions && { ln -s -f fibers-epoll.so.0.0.0 fibers-epoll.so.0 || { rm -f fibers-epoll.so.0 && ln -s fibers-epoll.so.0.0.0 fibers-epoll.so.0; }; })
 libtool: install: (cd /build/reproducible-path/guile-fibers-1.3.1/debian/tmp/usr/lib/aarch64-linux-gnu/guile/3.0/extensions && { ln -s -f fibers-epoll.so.0.0.0 fibers-epoll.so || { rm -f fibers-epoll.so && ln -s fibers-epoll.so.0.0.0 fibers-epoll.so; }; })
@@ -1036,12 +1072,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1826331/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/2360382 and its subdirectories
-I: Current time: Mon Mar 24 03:57:09 -12 2025
-I: pbuilder-time-stamp: 1742831829
+I: removing directory /srv/workspace/pbuilder/1826331 and its subdirectories
+I: Current time: Mon Apr 27 12:23:54 +14 2026
+I: pbuilder-time-stamp: 1777242234