Date: Sat, 11 Aug 2018 02:47:03 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 230491] stat(1): Improve performance with getpwuid() and getgrgid() caching Message-ID: <bug-230491-227-czF2FgzyM3@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-230491-227@https.bugs.freebsd.org/bugzilla/> References: <bug-230491-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230491 --- Comment #11 from Conrad Meyer <cem@freebsd.org> --- Here's my non-scientific results for my proposed patch (on CURRENT GENERIC, i.e., WITNESS and INVARIANTS are on, which introduces wider error bars than without, but still): BEFORE conrad@n /u/s/u/stat =E2=9D=AF=E2=9D=AF=E2=9D=AF time (find /usr/src -type = f -print0 | xargs -0 stat >/dev/null) ( find /usr/src -type f -print0 | xargs -0 stat > /dev/null; ) 3.62s user 5.23s system 102% cpu 8.655 total conrad@n /u/s/u/stat =E2=9D=AF=E2=9D=AF=E2=9D=AF time (find /usr/src -type = f -print0 | xargs -0 stat >/dev/null) ( find /usr/src -type f -print0 | xargs -0 stat > /dev/null; ) 3.47s user 5.38s system 102% cpu 8.647 total AFTER conrad@n /u/s/u/stat =E2=9D=AF=E2=9D=AF=E2=9D=AF time (find /usr/src -type = f -print0 | xargs -0 $(make -V .OBJDIR)/stat >/dev/null) ( find /usr/src -type f -print0 | xargs -0 $(make -V .OBJDIR)/stat > /dev/n= ul)=20 1.23s user 1.81s system 108% cpu 2.810 total conrad@n /u/s/u/stat =E2=9D=AF=E2=9D=AF=E2=9D=AF time (find /usr/src -type = f -print0 | xargs -0 $(make -V .OBJDIR)/stat >/dev/null) ( find /usr/src -type f -print0 | xargs -0 $(make -V .OBJDIR)/stat > /dev/n= ul)=20 1.43s user 1.54s system 107% cpu 2.754 total (I gave both programs a throw-away warm-up run first to make sure the disk caches were comparably primed, etc.) Seems like a clear win. --=20 You are receiving this mail because: You are the assignee for the bug.=
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