Your message dated Thu, 03 Sep 2009 07:00:19 +0200 with message-id <[email protected]> and subject line Re: Bug#423886: coreutils: tail very ineffecient has caused the Debian Bug report #423886, regarding coreutils: tail very ineffecient to be marked as done.
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--- Begin Message ---Package: coreutils Version: 5.97-5.3 Severity: normal Hi, I noticed that tail does not react as snappy to changes in a file it monitors (using 'tail -f') as is technically possible. So I did an strace on it and found the following fstat(3, {st_mode=S_IFREG|0644, st_size=3559, ...}) = 0 nanosleep({1, 0}, NULL) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=3559, ...}) = 0 nanosleep({1, 0}, NULL) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=3559, ...}) = 0 nanosleep({1, 0}, NULL) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=3559, ...}) = 0 nanosleep({1, 0}, NULL) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=3559, ...}) = 0 nanosleep({1, 0}, NULL) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=3559, ...}) = 0 nanosleep({1, 0}, NULL) = 0 ... as you can see it sleeps for a second between each check. Causing a delay of maximum 1 second before a change in the file monitored is reflected in the output of tail. Furthermore: it is not efficient to use fstat to see what has changed to the file. I propose a change to tail that either uses directly the inotify kernel-interface or via de sgi FAM-daemon. I once already implemented this using the older dnotify interface. -- System Information: Debian Release: lenny/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 2.6.18-4-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1) Shell: /bin/sh linked to /bin/bash Versions of packages coreutils depends on: ii libacl1 2.2.42-1 Access control list shared library ii libc6 2.5-5 GNU C Library: Shared libraries ii libselinux1 1.32-3 SELinux shared libraries coreutils recommends no packages. -- no debconf information
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--- Begin Message ---coreutils (7.5-1) unstable; urgency=low * new upstream version - tail --follow uses inotify -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
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