Your message dated Tue, 12 Jan 2021 12:07:22 +0100 with message-id <X/2C6mb/OZy/2261@chou> and subject line Re: Bug#975861: mercurial: after switching to pytohn3.9 it is 3 times as slow has caused the Debian Bug report #975861, regarding mercurial: after switching to pytohn3.9 it is 3 times as slow to be marked as done.
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--- Begin Message ---Package: mercurial Version: 5.5.2-1 Severity: normal Dear maintainer, After the Debian switch to python3.9 by default, mercurial got a lot slower, see the following tests in a small repository: $ time python3.9 /usr/bin/hg status real 0m0.403s user 0m0.391s sys 0m0.012s $ time python3.9 /usr/bin/hg status real 0m0.123s user 0m0.114s sys 0m0.008s Even a simple "hg" command without parameters takes about 0.35 seconds to show the help message. As python3.9 is the default, now all mercurial invocations are slow. Regards, Daniel. -- System Information: Debian Release: bullseye/sid APT prefers unstable APT policy: (500, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.9.0-3-amd64 (SMP w/8 CPU threads) Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages mercurial depends on: ii libc6 2.31-4 ii mercurial-common 5.5.2-1 ii python3 3.9.0-3 ii ucf 3.0043 Versions of packages mercurial recommends: ii openssh-client 1:8.4p1-2 Versions of packages mercurial suggests: pn kdiff3 | kdiff3-qt | kompare | meld | tkcvs | mgdiff <none> pn qct <none> -- no debconf information
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--- Begin Message ---On Mon, Jan 11, 2021 at 09:24:42PM -0300, Daniel Serpell wrote: > Hi Julien, > > Sorry for not replying earlier. > > On Fri, Jan 8, 2021 at 1:24 PM Julien Cristau <[email protected]> wrote: > > > > Hi Daniel, > > > [...] > > > > Can you provide the output of running hg status with the --profile > > option, in both the faster and slower cases? > > There is an error in the command above, the fast case was using > "python3.8", the slow case was using "python3.9". I reinstalled > python3.8 to test again, but mercurial did not run with python3.8 > anymore: > Right, you'd probably have to downgrade to the 5.5.2-1 version to be able to run with both 3.8 and 3.9. > -------------------- > $ python3.8 /usr/bin/hg status > Traceback (most recent call last): > File "/usr/lib/python3/dist-packages/mercurial/policy.py", line 69, > in _importfrom > fakelocals[modname] = mod = getattr(pkg, modname) > File "/usr/lib/python3/dist-packages/mercurial/pycompat.py", line 303, in w > return f(object, sysstr(name), *args) > AttributeError: module 'mercurial.cext' has no attribute 'parsers' > -------------------- > > But, I can't reproduce the slowdown anymore using current mercurial > and python3.9 versions in unstable, now it is fast again: > [...] > > So, you can close the bug. > Closing with this message, thanks for following up! Cheers, Julien
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