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Operating Systems Linux Red Hat Disk performance problem on login Post 302478215 by dangral on Tuesday 7th of December 2010 11:02:14 AM
Old 12-07-2010
So I found the script that was causing the poor performance, but other symptoms have surfaced as well. Sometimes a simple 'ls' on a directory with 30 files will cause the disk to spin for 45 or so seconds while the box is under no other I/O load. Again, no error messages are apparent, and SMART data looks fine.
 

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PMINST(1p)						User Contributed Perl Documentation						PMINST(1p)

NAME
pminst - find modules whose names match this pattern SYNOPSIS
pminst [-s] [-l] [pattern] DESCRIPTION
Without argumnets, show the names of all installed modules. Given a pattern, show all module names that match it. The -l flag will show the full pathname. The -s flag will separate the base directory from @INC from the module portion itself. EXAMPLES
$ pminst (lists all installed modules) $ pminst Carp CGI::Carp Carp $ pminst ^IO:: IO::Socket::INET IO::Socket::UNIX IO::Select IO::Socket IO::Poll IO::Handle IO::Pipe IO::Seekable IO::Dir IO::File $ pminst '(?i)io' IO::Socket::INET IO::Socket::UNIX IO::Select IO::Socket IO::Poll IO::Handle IO::Pipe IO::Seekable IO::Dir IO::File IO Pod::Functions The -s flag provides output with the directory separated by a space: $ pminst -s | sort +1 (lists all modules, sorted by name, but with where they came from) $ oldperl -S pminst -s IO /usr/lib/perl5/i386-linux/5.00404 IO::File /usr/lib/perl5/i386-linux/5.00404 IO::Handle /usr/lib/perl5/i386-linux/5.00404 IO::Pipe /usr/lib/perl5/i386-linux/5.00404 IO::Seekable /usr/lib/perl5/i386-linux/5.00404 IO::Select /usr/lib/perl5/i386-linux/5.00404 IO::Socket /usr/lib/perl5/i386-linux/5.00404 IO /usr/lib/perl5/site_perl LWP::IO /usr/lib/perl5/site_perl LWP::TkIO /usr/lib/perl5/site_perl Tk::HTML::IO /usr/lib/perl5/site_perl Tk::IO /usr/lib/perl5/site_perl IO::Stringy /usr/lib/perl5/site_perl IO::Wrap /usr/lib/perl5/site_perl IO::ScalarArray /usr/lib/perl5/site_perl IO::Scalar /usr/lib/perl5/site_perl IO::Lines /usr/lib/perl5/site_perl IO::WrapTie /usr/lib/perl5/site_perl IO::AtomicFile The -l flag gives full paths: $ filsperl -S pminst -l Thread /usr/local/filsperl/lib/5.00554/i686-linux-thread/Thread/Queue.pm /usr/local/filsperl/lib/5.00554/i686-linux-thread/Thread/Semaphore.pm /usr/local/filsperl/lib/5.00554/i686-linux-thread/Thread/Signal.pm /usr/local/filsperl/lib/5.00554/i686-linux-thread/Thread/Specific.pm /usr/local/filsperl/lib/5.00554/i686-linux-thread/Thread.pm AUTHORS and COPYRIGHTS Copyright (C) 1999 Tom Christiansen. Copyright (C) 2006-2008 Mark Leighton Fisher. This is free software; you can redistribute it and/or modify it under the terms of either: (a) the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or (b) the Perl "Artistic License". (This is the Perl 5 licensing scheme.) Please note this is a change from the original pmtools-1.00 (still available on CPAN), as pmtools-1.00 were licensed only under the Perl "Artistic License". perl v5.10.1 2010-02-22 PMINST(1p)
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