From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#18522: 24.4.50; mapcar is very slow Date: Wed, 24 Feb 2016 20:23:40 +0200 Message-ID: <83io1ege6r.fsf@gnu.org> References: <8738bkdjqg.fsf@micropit.roche-blanche.homenet.org> <87bn7b3hnz.fsf@roche-blanche.net> <83lh6fpv4z.fsf@gnu.org> <87h9h2xr9k.fsf@roche-blanche.net> <56C99AD0.2000309@gmx.at> <87wppywbaz.fsf@roche-blanche.net> <87d1rquo4a.fsf@roche-blanche.net> <878u2eun9o.fsf@roche-blanche.net> <834md2niqt.fsf@gnu.org> <87k2lyszy2.fsf@roche-blanche.net> <83bn79n66p.fsf@gnu.org> <87vb5hry9y.fsf@roche-blanche.net> <83r3g4lnor.fsf@gnu.org> <87r3g4o4uw.fsf@roche-blanche.net> <83h9h0jwfo.fsf@gnu.org> <87mvqru119.fsf@roche-blanche.net> <8360xfjsyr.fsf@gnu.org> <878u2bs7tl.fsf@roche-blanche.net> <83r3g3iajr.fsf@gnu.org> <87twkypfqx.fsf@roche-blanche.net> <83vb5egg8y.fsf@gnu.org> <87fuwikmzc.fsf@roche-blanche.net> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; 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Wed, 24 Feb 2016 13:23:43 -0500 In-reply-to: <87fuwikmzc.fsf@roche-blanche.net> (message from Peter =?UTF-8?Q?M=C3=BCnster?= on Wed, 24 Feb 2016 19:00:07 +0100) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:113736 Archived-At: > From: Peter Münster > Cc: rudalics@gmx.at, larsi@gnus.org, 18522@debbugs.gnu.org > Date: Wed, 24 Feb 2016 19:00:07 +0100 > > perf report: > > 33.17% emacs emacs [.] Fset_default > > Uptime is only about 1 day now. Length of all_buffers is 207. > > perf annotate: > > --8<---------------cut here---------------start------------->8--- > │ Fset_default(): > │ set it in the buffers that don't nominally have a local value. */ > │ if (idx > 0) > │ { > │ struct buffer *b; > │ int i = 0; > │ FOR_EACH_BUFFER (b) > 15.68 │101: mov 0x2d8(%rcx),%rcx > 19.34 │ test %rcx,%rcx > 5.39 │ ↑ jne f0 > │ { > │ i++; > │ if (!PER_BUFFER_VALUE_P (b, idx)) > │ set_per_buffer_value (b, offset, value); > │ } > │ fprintf(stderr, "XXXXX: %d\n", i); > 0.07 │10d: mov stderr@@GLIBC_2.2.5,%rdi > 2.49 │ mov $0x5e90e5,%esi > │ xor %eax,%eax > --8<---------------cut here---------------end--------------->8--- What is that "f0" there? Can you annotate it as well? Otherwise, this makes no sense to me: the part that takes most of the time is 2 simple instructions. Sounds like we are looking at too small portion of the code, so these are percents of a very small fraction of the total running time.