From: Dirk Gouders <dirk@gouders.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: alx.manpages@gmail.com, cjwatson@debian.org,
linux-man@vger.kernel.org, help-texinfo@gnu.org,
nabijaczleweli@nabijaczleweli.xyz, g.branden.robinson@gmail.com,
groff@gnu.org
Subject: Re: Accessibility of man pages
Date: Sat, 08 Apr 2023 22:46:46 +0200 [thread overview]
Message-ID: <ghcz4eksp5.fsf@gouders.net> (raw)
In-Reply-To: <83bkjym9bw.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 08 Apr 2023 23:02:11 +0300")
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Dirk Gouders <dirk@gouders.net>
>> Cc: Colin Watson <cjwatson@debian.org>, Eli Zaretskii <eliz@gnu.org>,
>> linux-man@vger.kernel.org, help-texinfo@gnu.org,
>> nabijaczleweli@nabijaczleweli.xyz, g.branden.robinson@gmail.com,
>> groff@gnu.org
>> Date: Sat, 08 Apr 2023 21:48:13 +0200
>>
>> $ find /usr/share/man -type f -exec bzgrep -l RLIMIT_NOFILE {} \;
>> /usr/share/man/man1/runuser.1.bz2
>> /usr/share/man/man1/su.1.bz2
>> /usr/share/man/man1/nghttpx.1.bz2
>> /usr/share/man/man3/getdtablesize.3.bz2
>> /usr/share/man/man3/mq_open.3.bz2
>> /usr/share/man/man3/errno.3.bz2
>> /usr/share/man/man3/sysconf.3.bz2
>> /usr/share/man/man3p/getrlimit.3p.bz2
>> /usr/share/man/man3p/sysconf.3p.bz2
>> /usr/share/man/man3p/posix_spawn_file_actions_addclose.3p.bz2
>> /usr/share/man/man0p/sys_resource.h.0p.bz2
>> /usr/share/man/man2/pidfd_open.2.bz2
>> /usr/share/man/man2/poll.2.bz2
>> /usr/share/man/man2/getrlimit.2.bz2
>> /usr/share/man/man2/open.2.bz2
>> /usr/share/man/man2/select.2.bz2
>> /usr/share/man/man2/fcntl.2.bz2
>> /usr/share/man/man2/seccomp_unotify.2.bz2
>> /usr/share/man/man2/dup.2.bz2
>> /usr/share/man/man2/pidfd_getfd.2.bz2
>> /usr/share/man/man7/fanotify.7.bz2
>> /usr/share/man/man7/capabilities.7.bz2
>> /usr/share/man/man7/unix.7.bz2
>> /usr/share/man/man5/proc.5.bz2
>>
>> Yes, it's very slow but close to `man -K`:
>>
>> find... man -K...
>>
>> real 107.45 real 96.34
>> user 117.06 user 70.11
>> sys 14.43 sys 26.86
>>
>> [a thought later]
>>
>> Oh, I found something much faster:
>>
>> $ time -p find /usr/share/man -type f | xargs bzgrep -l RLIMIT_NOFILE
>> [snip]
>>
>> real 24.30
>> user 32.34
>> sys 6.84
>>
>> Hmm, perhaps, someone has an explanation for this?
>
> Multiprocessing, obviously. Your CPU has more than one execution
> unit, so the pipe via xargs runs 'find' and 'bzgrep' in parallel on
> two different execution units. By contrast, "find -exec" runs them
> sequentially, in a single thread.
Yes, that must be it, thanks. I noticed `man -K...` uses up to four
CPUs in parallel and therefore was unsure.
With your explanation, we can get even faster:
$ time -p find /usr/share/man -type f | xargs -P 6 bzgrep -l RLIMIT_NOFILE
[snip]
real 7.56
user 32.97
sys 7.02
Dirk
PS: Colin, too late, I noticed a Mail-Followup-To Header in your mail.
For the future: Is it correct that in such a case one should use
that recipient list (without your address) -- even if he replies to
something you wrote? In that case: I'm sorry I did that wrong.
next prev parent reply other threads:[~2023-04-08 20:47 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-25 20:37 Playground pager lsp(1) Dirk Gouders
2023-03-25 20:47 ` Dirk Gouders
2023-04-04 23:45 ` Alejandro Colomar
2023-04-05 5:35 ` Eli Zaretskii
2023-04-06 1:10 ` Alejandro Colomar
2023-04-06 8:11 ` Eli Zaretskii
2023-04-06 8:48 ` Gavin Smith
2023-04-07 22:01 ` Alejandro Colomar
2023-04-08 7:05 ` Eli Zaretskii
2023-04-08 13:02 ` Accessibility of man pages (was: Playground pager lsp(1)) Alejandro Colomar
2023-04-08 13:42 ` Eli Zaretskii
2023-04-08 16:06 ` Alejandro Colomar
2023-04-08 13:47 ` Colin Watson
2023-04-08 15:42 ` Alejandro Colomar
2023-04-08 19:48 ` Accessibility of man pages Dirk Gouders
2023-04-08 20:02 ` Eli Zaretskii
2023-04-08 20:46 ` Dirk Gouders [this message]
2023-04-08 21:53 ` Alejandro Colomar
2023-04-08 22:33 ` Alejandro Colomar
2023-04-09 10:28 ` Ralph Corderoy
2023-04-08 20:31 ` Ingo Schwarze
2023-04-08 20:59 ` Dirk Gouders
2023-04-08 22:39 ` Ingo Schwarze
2023-04-09 9:50 ` Dirk Gouders
2023-04-09 10:35 ` Dirk Gouders
[not found] ` <87a5zhwntt.fsf@ada>
2023-04-09 12:05 ` Compressed man pages (was: Accessibility of man pages (was: Playground pager lsp(1))) Alejandro Colomar
2023-04-09 12:17 ` Alejandro Colomar
2023-04-09 18:55 ` G. Branden Robinson
2023-04-09 12:29 ` Colin Watson
2023-04-09 13:36 ` Alejandro Colomar
2023-04-09 13:47 ` Compressed man pages Ralph Corderoy
2023-04-12 8:13 ` Compressed man pages (was: Accessibility of man pages (was: Playground pager lsp(1))) Sam James
2023-04-12 8:32 ` Compressed man pages Ralph Corderoy
2023-04-12 10:35 ` Mingye Wang
2023-04-12 10:55 ` Ralph Corderoy
2023-04-12 13:04 ` Compressed man pages (was: Accessibility of man pages (was: Playground pager lsp(1))) Kerin Millar
2023-04-12 14:24 ` Alejandro Colomar
2023-04-12 18:52 ` Mingye Wang
2023-04-12 20:23 ` Compressed man pages Alejandro Colomar
2023-04-13 10:09 ` Ralph Corderoy
2023-04-07 2:18 ` Playground pager lsp(1) G. Branden Robinson
2023-04-07 6:36 ` Eli Zaretskii
2023-04-07 11:03 ` Gavin Smith
2023-04-07 14:43 ` man page rendering speed (was: Playground pager lsp(1)) G. Branden Robinson
2023-04-07 15:06 ` Eli Zaretskii
2023-04-07 15:08 ` Larry McVoy
2023-04-07 17:07 ` man page rendering speed Ingo Schwarze
2023-04-07 19:04 ` man page rendering speed (was: Playground pager lsp(1)) Alejandro Colomar
2023-04-07 19:28 ` Gavin Smith
2023-04-07 20:43 ` Alejandro Colomar
2023-04-07 16:08 ` Colin Watson
2023-04-08 11:24 ` Ralph Corderoy
2023-04-07 21:26 ` reformatting man pages at SIGWINCH " Alejandro Colomar
2023-04-07 22:09 ` reformatting man pages at SIGWINCH Dirk Gouders
2023-04-07 22:16 ` Alejandro Colomar
2023-04-10 19:05 ` Dirk Gouders
2023-04-10 19:57 ` Alejandro Colomar
2023-04-10 20:24 ` G. Branden Robinson
2023-04-11 9:20 ` Ralph Corderoy
2023-04-11 9:39 ` Dirk Gouders
2023-04-17 6:23 ` G. Branden Robinson
2023-04-08 11:40 ` Ralph Corderoy
2023-04-05 10:02 ` Playground pager lsp(1) Dirk Gouders
2023-04-05 14:19 ` Arsen Arsenović
2023-04-05 18:01 ` Dirk Gouders
2023-04-05 19:07 ` Eli Zaretskii
2023-04-05 19:56 ` Dirk Gouders
2023-04-05 20:38 ` A less presumptive .info? (was: Re: Playground pager lsp(1)) Arsen Arsenović
2023-04-06 8:14 ` Eli Zaretskii
2023-04-06 8:56 ` Gavin Smith
2023-04-07 13:14 ` Arsen Arsenović
2023-04-06 1:31 ` Playground pager lsp(1) Alejandro Colomar
2023-04-06 6:01 ` Dirk Gouders
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