[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[Efraim Flashner]

Over the years the grafting code has changed bit by bit, with various
attempts to speed it up.  By switching the grafts to not use parallelism
in rewriting the leaves we can finally switch the guile-for-grafts to be
guile-final.  The segfault is still there if we perform the grafts in
parallel, but I believe it is fast enough that it should be fine to do
them sequentially.

There's probably room in replace-store-references in (guix build graft)
for changes if we're not going to use guile-2.0 here anymore.

There are also a number of default guiles in (guix grafts) which should
maybe be %guile-for-grafts instead of %guile-for-build.

Efraim Flashner (2):
  graft: Remove work-around for old guile.
  graft: Perform grafts with guile-final.

 guix/build/graft.scm | 55 +++++---------------------------------------
 guix/packages.scm    |  6 ++---
 2 files changed, 8 insertions(+), 53 deletions(-)


base-commit: 51de844a0ff6ea224367a384092896bce6848b9f
prerequisite-patch-id: ea387a4f9d860397a26c840c11c8742f0ac70fc3
-- 
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[bug#70303] [PATCH 1/2] graft: Remove work-around for old guile.

[Efraim Flashner]

* guix/build/graft.scm (mkdir-p*): Remove function.
(rewrite-directory): Switch from mkdir-p* to mkdir-p.

Change-Id: Ib6a80648d271c19093c05af84acb967e069ccc19
---
 guix/build/graft.scm | 31 ++-----------------------------
 1 file changed, 2 insertions(+), 29 deletions(-)

diff --git a/guix/build/graft.scm b/guix/build/graft.scm
index 281dbaba6f..c8c7e33ab2 100644
--- a/guix/build/graft.scm
+++ b/guix/build/graft.scm
@@ -312,33 +312,6 @@ (define (exit-on-exception proc)
           (print-exception port #f key args)
           (primitive-exit 1))))))
 
-;; We need this as long as we support Guile < 2.0.13.
-(define* (mkdir-p* dir #:optional (mode #o755))
-  "This is a variant of 'mkdir-p' that works around
-<http://bugs.gnu.org/24659> by passing MODE explicitly in each 'mkdir' call."
-  (define absolute?
-    (string-prefix? "/" dir))
-
-  (define not-slash
-    (char-set-complement (char-set #\/)))
-
-  (let loop ((components (string-tokenize dir not-slash))
-             (root       (if absolute?
-                             ""
-                             ".")))
-    (match components
-      ((head tail ...)
-       (let ((path (string-append root "/" head)))
-         (catch 'system-error
-           (lambda ()
-             (mkdir path mode)
-             (loop tail path))
-           (lambda args
-             (if (= EEXIST (system-error-errno args))
-                 (loop tail path)
-                 (apply throw args))))))
-      (() #t))))
-
 (define* (rewrite-directory directory output mapping
                             #:optional (store (%store-directory)))
   "Copy DIRECTORY to OUTPUT, replacing strings according to MAPPING, a list of
@@ -387,7 +360,7 @@ (define* (rewrite-directory directory output mapping
   (define (rewrite-leaf file)
     (let ((stat (lstat file))
           (dest (destination file)))
-      (mkdir-p* (dirname dest))
+      (mkdir-p (dirname dest))
       (case (stat:type stat)
         ((symlink)
          (let ((target (readlink file)))
@@ -406,7 +379,7 @@ (define* (rewrite-directory directory output mapping
                                            store)
                  (chmod output (stat:perms stat)))))))
         ((directory)
-         (mkdir-p* dest))
+         (mkdir-p dest))
         (else
          (error "unsupported file type" stat)))))
 
-- 
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bug#70303: [PATCH 1/2] graft: Remove work-around for old guile.

[Efraim Flashner]

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Patches pushed

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[bug#70303] [PATCH 2/2] graft: Perform grafts with guile-final.

[Efraim Flashner]

* guix/build/graft.scm (rewrite-directory): Rewrite store directories in
individual files sequentially.
(exit-on-exception): Remove procedure.
* guix/packages.scm (guile-for-grafts): Switch to guile-final.

Change-Id: I50f7b23a3ceff8bb1495dc1f4bc772746147d924
---
 guix/build/graft.scm | 24 ++++--------------------
 guix/packages.scm    |  6 ++----
 2 files changed, 6 insertions(+), 24 deletions(-)

diff --git a/guix/build/graft.scm b/guix/build/graft.scm
index c8c7e33ab2..7fc5ecba99 100644
--- a/guix/build/graft.scm
+++ b/guix/build/graft.scm
@@ -299,19 +299,6 @@ (define (rename-matching-files directory mapping)
                                (string-append (dirname file) "/" target))))
               matches)))
 
-(define (exit-on-exception proc)
-  "Return a procedure that wraps PROC so that 'primitive-exit' is called when
-an exception is caught."
-  (lambda (arg)
-    (catch #t
-      (lambda ()
-        (proc arg))
-      (lambda (key . args)
-        ;; Since ports are not thread-safe as of Guile 2.0, reopen stderr.
-        (let ((port (fdopen 2 "w0")))
-          (print-exception port #f key args)
-          (primitive-exit 1))))))
-
 (define* (rewrite-directory directory output mapping
                             #:optional (store (%store-directory)))
   "Copy DIRECTORY to OUTPUT, replacing strings according to MAPPING, a list of
@@ -383,13 +370,10 @@ (define* (rewrite-directory directory output mapping
         (else
          (error "unsupported file type" stat)))))
 
-  ;; Use 'exit-on-exception' to force an exit upon I/O errors, given that
-  ;; 'n-par-for-each' silently swallows exceptions.
-  ;; See <http://bugs.gnu.org/23581>.
-  (n-par-for-each (parallel-job-count)
-                  (exit-on-exception rewrite-leaf)
-                  (find-files directory (const #t)
-                              #:directories? #t))
+  ;; n-par-for-each can lead to segfaults in the grafting code.
+  (for-each rewrite-leaf
+            (find-files directory (const #t)
+                        #:directories? #t))
   (rename-matching-files output mapping))
 
 (define %graft-hooks
diff --git a/guix/packages.scm b/guix/packages.scm
index 930b1a3b0e..80642eb049 100644
--- a/guix/packages.scm
+++ b/guix/packages.scm
@@ -882,10 +882,8 @@ (define (default-guile)
 
 (define (guile-for-grafts)
   "Return the Guile package used to build grafting derivations."
-  ;; Guile 2.2 would not work due to <https://bugs.gnu.org/28211> when
-  ;; grafting packages.
-  (let ((distro (resolve-interface '(gnu packages guile))))
-    (module-ref distro 'guile-2.0)))
+  (let ((distro (resolve-interface '(gnu packages commencement))))
+    (module-ref distro 'guile-final)))
 
 (define* (default-guile-derivation #:optional (system (%current-system)))
   "Return the derivation for SYSTEM of the default Guile package used to run
-- 
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[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[Ludovic Courtès]

Howdy!

Efraim Flashner <efraim@flashner.co.il> skribis:

> Over the years the grafting code has changed bit by bit, with various
> attempts to speed it up.  By switching the grafts to not use parallelism
> in rewriting the leaves we can finally switch the guile-for-grafts to be
> guile-final.  The segfault is still there if we perform the grafts in
> parallel, but I believe it is fast enough that it should be fine to do
> them sequentially.

Could you time the grafting derivation of, say, libreoffice or
ungoogled-chromium?

Typically I’d do it along these lines:

--8<---------------cut here---------------start------------->8---
$ guix build libreoffice
/gnu/store/24is7ypdx6sm56mkclxdx4hyj7yg4smb-libreoffice-7.6.3.1
$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
$ time guix build libreoffice --check
The following graft will be made:
   /gnu/store/wdjqpxm2kbdvq7qlrzyjxb244zn3s3bv-libreoffice-7.6.3.1.drv
applying 137 grafts for libreoffice-7.6.3.1 ...
grafting '/gnu/store/5flppg3h8y235di2ilr3sx878gfl82db-libreoffice-7.6.3.1' -> '/gnu/store/24is7ypdx6sm56mkclxdx4hyj7yg4smb-libreoffice-7.6.3.1'...
successfully built /gnu/store/wdjqpxm2kbdvq7qlrzyjxb244zn3s3bv-libreoffice-7.6.3.1.drv
successfully built /gnu/store/wdjqpxm2kbdvq7qlrzyjxb244zn3s3bv-libreoffice-7.6.3.1.drv
/gnu/store/24is7ypdx6sm56mkclxdx4hyj7yg4smb-libreoffice-7.6.3.1

real    0m14.921s
user    0m7.588s
sys     0m0.389s
--8<---------------cut here---------------end--------------->8---

(That’s on my 4-core i7.)

It’s a bummer that the segfault is still there.  I remember week-long
‘rr’ debugging sessions in the past, where I did find a few issues; I
should try again but uh…

> There's probably room in replace-store-references in (guix build graft)
> for changes if we're not going to use guile-2.0 here anymore.

I believe ‘tests/grafts.scm’ may run some of this code under Guile 2.0
(using the ‘guile-bootstrap’ tarball provided for the tests).

Thanks,
Ludo’.

[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[Efraim Flashner]

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On Mon, Apr 15, 2024 at 10:28:17PM +0200, Ludovic Courtès wrote:
> Howdy!
> 
> Efraim Flashner <efraim@flashner.co.il> skribis:
> 
> > Over the years the grafting code has changed bit by bit, with various
> > attempts to speed it up.  By switching the grafts to not use parallelism
> > in rewriting the leaves we can finally switch the guile-for-grafts to be
> > guile-final.  The segfault is still there if we perform the grafts in
> > parallel, but I believe it is fast enough that it should be fine to do
> > them sequentially.
> 
> Could you time the grafting derivation of, say, libreoffice or
> ungoogled-chromium?
> 
> Typically I’d do it along these lines:
> 
> --8<---------------cut here---------------start------------->8---
> $ guix build libreoffice
> /gnu/store/24is7ypdx6sm56mkclxdx4hyj7yg4smb-libreoffice-7.6.3.1
> $ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
> $ time guix build libreoffice --check
> The following graft will be made:
>    /gnu/store/wdjqpxm2kbdvq7qlrzyjxb244zn3s3bv-libreoffice-7.6.3.1.drv
> applying 137 grafts for libreoffice-7.6.3.1 ...
> grafting '/gnu/store/5flppg3h8y235di2ilr3sx878gfl82db-libreoffice-7.6.3.1' -> '/gnu/store/24is7ypdx6sm56mkclxdx4hyj7yg4smb-libreoffice-7.6.3.1'...
> successfully built /gnu/store/wdjqpxm2kbdvq7qlrzyjxb244zn3s3bv-libreoffice-7.6.3.1.drv
> successfully built /gnu/store/wdjqpxm2kbdvq7qlrzyjxb244zn3s3bv-libreoffice-7.6.3.1.drv
> /gnu/store/24is7ypdx6sm56mkclxdx4hyj7yg4smb-libreoffice-7.6.3.1
> 
> real    0m14.921s
> user    0m7.588s
> sys     0m0.389s
> --8<---------------cut here---------------end--------------->8---
> 
> (That’s on my 4-core i7.)

I'm currently vising my parents for a few weeks during the Passover
break, and I've already lost connection to my desktop at home, so I'm
currently running the tests on my pinebook pro.

The first one is with the patches applied, the second one is without the
patches. I have the guix-daemon on my pinebook pro to use 3 cores, but
I'm not sure how much that would be honored by the grafting code.

(ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
Password:
(ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build libreoffice --check
The following graft will be made:
   /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
applying 137 grafts for libreoffice-7.6.3.1 ...
grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1'...
successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
/gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1

real    1m35.537s
user    0m32.328s
sys     0m2.521s
(ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
(ins)efraim@pbp ~/workspace/guix$ time guix build libreoffice --check
The following graft will be made:
   /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
applying 137 grafts for libreoffice-7.6.3.1 ...
grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1'...
successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
/gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1

real    1m20.573s
user    0m29.688s
sys     0m2.346s

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[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[Ludovic Courtès]

Hi!

Efraim Flashner <efraim@flashner.co.il> skribis:

> The first one is with the patches applied, the second one is without the
> patches. I have the guix-daemon on my pinebook pro to use 3 cores, but
> I'm not sure how much that would be honored by the grafting code.
>
> (ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
> Password:
> (ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build libreoffice --check
> The following graft will be made:
>    /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
> applying 137 grafts for libreoffice-7.6.3.1 ...
> grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1'...
> successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
> successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
> /gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1
>
> real    1m35.537s
> user    0m32.328s
> sys     0m2.521s
> (ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
> (ins)efraim@pbp ~/workspace/guix$ time guix build libreoffice --check
> The following graft will be made:
>    /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
> applying 137 grafts for libreoffice-7.6.3.1 ...
> grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1'...
> successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
> successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
> /gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1
>
> real    1m20.573s
> user    0m29.688s
> sys     0m2.346s

That’s an 18% slowdown.  Could you make several runs to see how stable
that is?

Thanks,
Ludo’.

[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[Ludovic Courtès]

Hi Efraim,

Ludovic Courtès <ludo@gnu.org> skribis:

> Efraim Flashner <efraim@flashner.co.il> skribis:
>
>> The first one is with the patches applied, the second one is without the
>> patches. I have the guix-daemon on my pinebook pro to use 3 cores, but
>> I'm not sure how much that would be honored by the grafting code.
>>
>> (ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
>> Password:
>> (ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build libreoffice --check
>> The following graft will be made:
>>    /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
>> applying 137 grafts for libreoffice-7.6.3.1 ...
>> grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1'...
>> successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
>> successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
>> /gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1
>>
>> real    1m35.537s
>> user    0m32.328s
>> sys     0m2.521s
>> (ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
>> (ins)efraim@pbp ~/workspace/guix$ time guix build libreoffice --check
>> The following graft will be made:
>>    /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
>> applying 137 grafts for libreoffice-7.6.3.1 ...
>> grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1'...
>> successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
>> successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
>> /gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1
>>
>> real    1m20.573s
>> user    0m29.688s
>> sys     0m2.346s
>
> That’s an 18% slowdown.  Could you make several runs to see how stable
> that is?

Looks like this patch fell through the cracks.

Maybe we should just go ahead and apply it.  Depending on Guile 2.0 for
this isn’t viable in the long term anyway.

WDYT?

Ludo’.

[bug#70303] [PATCH 0/2] Use guile-final for grafting.

[Efraim Flashner]

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On Thu, Jul 18, 2024 at 05:14:27PM +0200, Ludovic Courtès wrote:
> Hi Efraim,
> 
> Ludovic Courtès <ludo@gnu.org> skribis:
> 
> > Efraim Flashner <efraim@flashner.co.il> skribis:
> >
> >> The first one is with the patches applied, the second one is without the
> >> patches. I have the guix-daemon on my pinebook pro to use 3 cores, but
> >> I'm not sure how much that would be honored by the grafting code.
> >>
> >> (ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
> >> Password:
> >> (ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build libreoffice --check
> >> The following graft will be made:
> >>    /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
> >> applying 137 grafts for libreoffice-7.6.3.1 ...
> >> grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1'...
> >> successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
> >> successfully built /gnu/store/i2aml4p5yg7h090bdzjpaqmds47g26d8-libreoffice-7.6.3.1.drv
> >> /gnu/store/1cfjx934czp641v4fmwsz2js7158ivgm-libreoffice-7.6.3.1
> >>
> >> real    1m35.537s
> >> user    0m32.328s
> >> sys     0m2.521s
> >> (ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
> >> (ins)efraim@pbp ~/workspace/guix$ time guix build libreoffice --check
> >> The following graft will be made:
> >>    /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
> >> applying 137 grafts for libreoffice-7.6.3.1 ...
> >> grafting '/gnu/store/yd9slkfhdl8lzhhmhm40airimwb6yhj5-libreoffice-7.6.3.1' -> '/gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1'...
> >> successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
> >> successfully built /gnu/store/2f6i7r77z8msbjlspsp0aq5vlpjqnifp-libreoffice-7.6.3.1.drv
> >> /gnu/store/xm3q8qsns8qqybq47zvv70n0y0qs4r65-libreoffice-7.6.3.1
> >>
> >> real    1m20.573s
> >> user    0m29.688s
> >> sys     0m2.346s
> >
> > That’s an 18% slowdown.  Could you make several runs to see how stable
> > that is?
> 
> Looks like this patch fell through the cracks.
> 
> Maybe we should just go ahead and apply it.  Depending on Guile 2.0 for
> this isn’t viable in the long term anyway.
> 
> WDYT?

Since your email I've been playing with it a bit more. I switched from
libreoffice to python since libreoffice isn't built yet for aarch64.

Before the patches

(ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
(ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build python --check
The following graft will be made:
   /gnu/store/b460sh7szir8rf13rjci9cpcbnwgsr04-python-3.10.7.drv
applying 16 grafts for python-3.10.7 ...
grafting '/gnu/store/qc7n1mflwv12prx185w5wqd95nry5jl1-python-3.10.7-idle' -> '/gnu/store/g3lna24jdg6giddy79kij35kqv9fyr0r-python-3.10.7-idle'...
grafting '/gnu/store/vsy0hfgcvrw6fnz53qqqk8ss3c67x2qi-python-3.10.7' -> '/gnu/store/697bsvp9vzj4h6zn3gpgg04h8w36mprl-python-3.10.7'...
grafting '/gnu/store/8nj5cwhbfbwb3lf33wsa51rg0v2qbwjb-python-3.10.7-tk' -> '/gnu/store/f051i1aa74z5js30fm4vg4mccsf070w9-python-3.10.7-tk'...
successfully built /gnu/store/b460sh7szir8rf13rjci9cpcbnwgsr04-python-3.10.7.drv
successfully built /gnu/store/b460sh7szir8rf13rjci9cpcbnwgsr04-python-3.10.7.drv
successfully built /gnu/store/b460sh7szir8rf13rjci9cpcbnwgsr04-python-3.10.7.drv
successfully built /gnu/store/b460sh7szir8rf13rjci9cpcbnwgsr04-python-3.10.7.drv
/gnu/store/g3lna24jdg6giddy79kij35kqv9fyr0r-python-3.10.7-idle
/gnu/store/697bsvp9vzj4h6zn3gpgg04h8w36mprl-python-3.10.7
/gnu/store/f051i1aa74z5js30fm4vg4mccsf070w9-python-3.10.7-tk

real    0m52.734s
user    0m8.821s
sys     0m1.489s

After the patches

(ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
(ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build python --check
The following graft will be made:
   /gnu/store/ny03k54s1f0dffn9rywsmf7rd2znsnn5-python-3.10.7.drv
applying 16 grafts for python-3.10.7 ...
grafting '/gnu/store/qc7n1mflwv12prx185w5wqd95nry5jl1-python-3.10.7-idle' -> '/gnu/store/s6gh2f9fnpsrjhb9arcwvk7ydr2yynd0-python-3.10.7-idle'...
grafting '/gnu/store/vsy0hfgcvrw6fnz53qqqk8ss3c67x2qi-python-3.10.7' -> '/gnu/store/w1nk4b8zadnrzd8m8dgfiyhfpm4d2s89-python-3.10.7'...
grafting '/gnu/store/8nj5cwhbfbwb3lf33wsa51rg0v2qbwjb-python-3.10.7-tk' -> '/gnu/store/na5an7jrlwvv4ykl5dvmw303dlsavznq-python-3.10.7-tk'...
successfully built /gnu/store/ny03k54s1f0dffn9rywsmf7rd2znsnn5-python-3.10.7.drv
successfully built /gnu/store/ny03k54s1f0dffn9rywsmf7rd2znsnn5-python-3.10.7.drv
successfully built /gnu/store/ny03k54s1f0dffn9rywsmf7rd2znsnn5-python-3.10.7.drv
successfully built /gnu/store/ny03k54s1f0dffn9rywsmf7rd2znsnn5-python-3.10.7.drv
/gnu/store/s6gh2f9fnpsrjhb9arcwvk7ydr2yynd0-python-3.10.7-idle
/gnu/store/w1nk4b8zadnrzd8m8dgfiyhfpm4d2s89-python-3.10.7
/gnu/store/na5an7jrlwvv4ykl5dvmw303dlsavznq-python-3.10.7-tk

real    1m22.324s
user    0m8.758s
sys     0m1.621s

There was an unconditional mkdir-p in the graft code that I made check
for the directory first

(ins)efraim@pbp ~/workspace/guix$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
(ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build python --check
The following graft will be made:
   /gnu/store/jryp0i86fll06swc856d5njyf4knzw7z-python-3.10.7.drv
applying 16 grafts for python-3.10.7 ...
grafting '/gnu/store/qc7n1mflwv12prx185w5wqd95nry5jl1-python-3.10.7-idle' -> '/gnu/store/z5zw3f31x7xp71lw9rihkvcf7pmsyz0k-python-3.10.7-idle'...
grafting '/gnu/store/vsy0hfgcvrw6fnz53qqqk8ss3c67x2qi-python-3.10.7' -> '/gnu/store/k6kvr48gcjn9z4q3gd51wyddinyxxcw2-python-3.10.7'...
grafting '/gnu/store/8nj5cwhbfbwb3lf33wsa51rg0v2qbwjb-python-3.10.7-tk' -> '/gnu/store/gwync0539a5ixgds3k97440zg7miqiq1-python-3.10.7-tk'...
successfully built /gnu/store/jryp0i86fll06swc856d5njyf4knzw7z-python-3.10.7.drv
successfully built /gnu/store/jryp0i86fll06swc856d5njyf4knzw7z-python-3.10.7.drv
successfully built /gnu/store/jryp0i86fll06swc856d5njyf4knzw7z-python-3.10.7.drv
successfully built /gnu/store/jryp0i86fll06swc856d5njyf4knzw7z-python-3.10.7.drv
/gnu/store/z5zw3f31x7xp71lw9rihkvcf7pmsyz0k-python-3.10.7-idle
/gnu/store/k6kvr48gcjn9z4q3gd51wyddinyxxcw2-python-3.10.7
/gnu/store/gwync0539a5ixgds3k97440zg7miqiq1-python-3.10.7-tk

real    1m7.380s
user    0m8.990s
sys     0m1.617s

Then I re-enabled n-par-for-each (without exit-on-exception)

(ins)efraim@pbp ~/workspace/guix$ time ./pre-inst-env guix build python --check
The following graft will be made:
   /gnu/store/3kr7477zfivxxan5r6ljl81cq3p1j9m8-python-3.10.7.drv
applying 16 grafts for python-3.10.7 ...
grafting '/gnu/store/qc7n1mflwv12prx185w5wqd95nry5jl1-python-3.10.7-idle' -> '/gnu/store/r9dw90ijwyrzl39yind3iza5bpbcvys2-python-3.10.7-idle'...
grafting '/gnu/store/vsy0hfgcvrw6fnz53qqqk8ss3c67x2qi-python-3.10.7' -> '/gnu/store/0zzck57k9321h7lhzlfw5wr87jyqpiv3-python-3.10.7'...
grafting '/gnu/store/8nj5cwhbfbwb3lf33wsa51rg0v2qbwjb-python-3.10.7-tk' -> '/gnu/store/v4wg35f62r546hy8f2lbsf51vb8rh0jz-python-3.10.7-tk'...
successfully built /gnu/store/3kr7477zfivxxan5r6ljl81cq3p1j9m8-python-3.10.7.drv
successfully built /gnu/store/3kr7477zfivxxan5r6ljl81cq3p1j9m8-python-3.10.7.drv
successfully built /gnu/store/3kr7477zfivxxan5r6ljl81cq3p1j9m8-python-3.10.7.drv
successfully built /gnu/store/3kr7477zfivxxan5r6ljl81cq3p1j9m8-python-3.10.7.drv
/gnu/store/r9dw90ijwyrzl39yind3iza5bpbcvys2-python-3.10.7-idle
/gnu/store/0zzck57k9321h7lhzlfw5wr87jyqpiv3-python-3.10.7
/gnu/store/v4wg35f62r546hy8f2lbsf51vb8rh0jz-python-3.10.7-tk

real    0m55.129s
user    0m9.082s
sys     0m1.612s

I only have 3 cores enabled on my pinebook pro so I can't really comment
on weather n-par-for-each does in fact still trigger segfaults in the
grafting code, but I haven't seen any.

-- 
Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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