From Newsgroup: muc.lists.freebsd.stable

On Dec 9, 2025, at 17:15, Mark Millard <marklmi@yahoo.com> wrote:

On Dec 9, 2025, at 12:32, Mark Millard <marklmi@yahoo.com> wrote:

On Dec 9, 2025, at 07:22, Rozhuk Ivan <rozhuk.im@gmail.com> wrote:

On Mon, 8 Dec 2025 09:23:52 -0800
Mark Millard <marklmi@yahoo.com> wrote:

But, as of yet, I've no good evidence for blaming
jemalloc as a major contributor to those timing
ratios --or for blaming any other specific part
of 15.0 .

If you want to bench jmalloc - there is another ways to do that without building something.
Try to find some sythetic benchmarks.
Also jmalloc can be build without OS rebuild and linked with bench.

This 2 things can reduce time to tests, but it will eliminate OS integation factors.
Run same bench on different OS may give more info.

[I've eliminated direct Email to most everyone
for this reply. There is not even minor new
technical content.]

At this point I'm more likely to explore if I
get similar ratios as ampere[13] do for some
port-package builds that have the large ratios on
ampere[13]. There are examples that are not as
overall time consuming for ampere[13] as what I've
already referenced (but are still non-trivial for
the time taken). As stands, I do not have a good
reproduce-the-issue context, much less one with
build time frames I'd be willing to deal with in
my environment.

Time-ratios similar to the ampere[13] ones for
15.0 vs. 14.3 (or 13.5) were easily repeatable
on the Microsoft Windows Dev Kit 2023 for doing
poudriere builds of the examples that I tried.

port-package builds tested for below: devel/cmake-core
TMPFS_BLACKLIST empty
ALLOW_MAKE_JOBS= in use (no explicit MAKE_JOBS_NUMBER like restrictions)
UFS context (except for what USE_TMPFS=all does in poudriere)
The below did not update /usr/ports/distfiles/ .

This does some exploration of USE_TMPFS=no vs.
USE_TMPFS=all as well, starting with
USE_TMPFS=no .

Listed in the sequence executed, first time
runs shown first:

USE_TMPFS=no . . .
(Note: The first times had other port-packages to build first.)

15.0 poudriere jail:
[00:37:37] [01] [00:12:30] Finished devel/cmake-core | cmake-core-3.31.9: Success

14.3 poudriere jail:
[00:28:26] [01] [00:09:38] Finished devel/cmake-core | cmake-core-3.31.9: Success

Approx. 1.30 time ratio (15.0's 12:30 / 14.3's 9:38)

USE_TMPFS=all (no tmpfs black list) . . .

14.3 poudriere jail:
[00:09:32] [03] [00:09:24] Finished devel/cmake-core | cmake-core-3.31.9: Success

15.0 poudriere jail:
[00:12:45] [03] [00:12:34] Finished devel/cmake-core | cmake-core-3.31.9: Success

Approx. 1.34 time ratio (15.0's/14.3's)

The following also prefixed the poudriere bulk -C command
with: time -l

15.0 poudriere jail:
[00:12:36] [04] [00:12:25] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
757.10 real 4613.06 user 251.09 sys
866580 maximum resident set size
131 average shared memory size
27 average unshared data size
234 average unshared stack size
31148816 page reclaims
0 page faults
0 swaps
14 block input operations
36 block output operations
37061 messages sent
33671 messages received
1758 signals received
143987 voluntary context switches
167515 involuntary context switches

14.3 poudriere jail:
[00:09:23] [01] [00:09:15] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
564.48 real 3449.89 user 204.14 sys
822900 maximum resident set size
64692 average shared memory size
791 average unshared data size
235 average unshared stack size
28153497 page reclaims
0 page faults
0 swaps
9 block input operations
12 block output operations
34180 messages sent
31539 messages received
1758 signals received
131899 voluntary context switches
132775 involuntary context switches

Approx. 1.34 time ratio (15.0's/14.3's)

USE_TMPFS=no . . . (again)

15.0 poudriere jail:
[00:13:01] [04] [00:12:27] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
784.89 real 4596.42 user 257.12 sys
866600 maximum resident set size
128 average shared memory size
25 average unshared data size
234 average unshared stack size
31194466 page reclaims
2371 page faults
0 swaps
3573 block input operations
6687 block output operations
37643 messages sent
33840 messages received
1756 signals received
241548 voluntary context switches
304249 involuntary context switches

14.3 poudriere jail:
[00:09:49] [04] [00:09:18] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
592.83 real 3446.18 user 207.61 sys
823880 maximum resident set size
64712 average shared memory size
787 average unshared data size
236 average unshared stack size
28176650 page reclaims
2374 page faults
0 swaps
3481 block input operations
5148 block output operations
34521 messages sent
31580 messages received
1758 signals received
218881 voluntary context switches
255193 involuntary context switches

Approx. 1.34 time ratio (15.0's/14.3's)

Only some port-packages have time-ratios
near 1.34. For example, building lang/gcc15
does not on ampere[13]: closer to 1.1 as
I remember. (For the most part, lang/gcc15
does most of its own building based on a
smaller amount of clang-built code
to bootstrap.)

For reference:

# poudriere jail -l
JAILNAME VERSION OSVERSION ARCH METHOD TIMESTAMP PATH
release14-aarch64 14.3-RELEASE-p6 1403000 arm64.aarch64 ftp-archive 2025-12-09 12:54:06 /usr/local/poudriere/jails/release14-aarch64
. . .
release-aarch64 15.0-RELEASE 1500068 aarch64 pkgbase 2025-12-06 11:34:39 /usr/local/poudriere/jails/release-aarch64
. . .

# ~/fbsd-based-on-what-commit.sh -C /usr/ports
bb7b77417165 (HEAD -> main, freebsd/main, freebsd/HEAD) www/hurl: update 7.0.0 -> 7.1.0
Author: Rodrigo Osorio <rodrigo@FreeBSD.org>
Commit: Rodrigo Osorio <rodrigo@FreeBSD.org>
CommitDate: 2025-11-28 23:11:52 +0000
branch: main
merge-base: bb7b774171651eea0dc56376c225fe976231daa5
merge-base: CommitDate: 2025-11-28 23:11:52 +0000
n726888 (--first-parent --count for merge-base)

# uname -apKU
FreeBSD aarch64-main-pbase 16.0-CURRENT FreeBSD 16.0-CURRENT main-n281922-4872b48b175c GENERIC-NODEBUG arm64 aarch64 1600004 1600004

(That last was an official pkgbase distribution.)

14.3-STABLE does not have jemalloc 5.3.0 or libsys
but performs like 15.0-RELEASE, not 14.3-RELEASE
for the aarch64 devel/cmake-core build tests.
But 14.3-STABLE does have:
# ldd /usr/local/poudriere/jails/official14-aarch64/usr/bin/cc /usr/local/poudriere/jails/official14-aarch64/usr/bin/cc:
libprivateclang.so.19 => /usr/lib/libprivateclang.so.19 (0x732e0d600000)
libprivatellvm.so.19 => /usr/lib/libprivatellvm.so.19 (0x732e12600000) . . .
while 14.3-RELEASE does not.
(Another data point is that lang/gcc15 does not have
nearly as large of a time-ratio vs. 14.3-RELEASE
in the data from ampere[13] .)
Details from the Microsoft Dev Kit 2023 experiments
. . .
I've collected a sequence for a new poudriere jail
to compare/contrast with:
# poudriere jail -l
JAILNAME VERSION OSVERSION ARCH METHOD TIMESTAMP PATH
. . .
official14-aarch64 14.3-STABLE 1403506 arm64.aarch64 freebsdci 2025-12-09 18:24:20 /usr/local/poudriere/jails/official14-aarch64
. . .
(ampere[13] do not have examples of recent 14.3-STABLE builds at this point.) USE_TMPFS=no . . .
(Note: The first times had other port-packages to build first.
But the system still has the cached the file system data.)
stable/14 poudriere jail:
[00:36:29] [01] [00:12:31] Finished devel/cmake-core | cmake-core-3.31.9: Success
So: 12:31 is far more like 15.0-RELEASE
USE_TMPFS=all . . .
stable/14 poudriere jail:
[00:12:21] [07] [00:12:10] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
742.70 real 4586.53 user 248.37 sys
864996 maximum resident set size
133 average shared memory size
24 average unshared data size
235 average unshared stack size
30958626 page reclaims
0 page faults
0 swaps
456 block input operations
80 block output operations
35920 messages sent
33223 messages received
1760 signals received
140580 voluntary context switches
164112 involuntary context switches
So: 12:10 is far more like 15.0-RELEASE
stable/14 poudriere jail (again):
[00:12:30] [08] [00:12:19] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
751.98 real 4604.85 user 251.40 sys
866056 maximum resident set size
125 average shared memory size
21 average unshared data size
235 average unshared stack size
30976603 page reclaims
0 page faults
0 swaps
20 block input operations
11 block output operations
36297 messages sent
33327 messages received
1761 signals received
144213 voluntary context switches
166975 involuntary context switches
So: 12:19 is far more like 15.0-RELEASE
USE_TMPFS=no . . .
(Note: The first times had other port-packages to build first.)
stable/14 poudriere jail:
[00:13:16] [05] [00:12:49] Finished devel/cmake-core | cmake-core-3.31.9: Success
. . .
799.95 real 4626.06 user 261.49 sys
865940 maximum resident set size
134 average shared memory size
24 average unshared data size
235 average unshared stack size
31110419 page reclaims
2380 page faults
0 swaps
3577 block input operations
6262 block output operations
37253 messages sent
33801 messages received
1758 signals received
236161 voluntary context switches
312615 involuntary context switches
So: 12:49 is far more like 15.0-RELEASE
(Nice to have a known repeatable context to try
variations with.)
===
Mark Millard
marklmi at yahoo.com
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