linux-kernel - Re: IO latency

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Message-ID: <20090405062626.GA7760@mit.edu>
Date:	Sun, 5 Apr 2009 02:26:26 -0400
From:	Theodore Tso <tytso@....edu>
To:	"Trenton D. Adams" <trenton.d.adams@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: IO latency - a special case

On Sun, Apr 05, 2009 at 12:13:44AM -0600, Trenton D. Adams wrote:
> Hi Ted,
> 
> I have no idea what "sar" is, and a google search doesn't appear to
> reveal anything useful.  Where can I get this "sar" tool?
> 
> I also do not have "iostat" on my system, and again, google does not
> appear to reveal an official page for that, and gentoo doesn't appear
> to have a package for it.

Both "sar" and "iostat" are part of the sysstat package.

Package: sysstat
Priority: optional
Section: admin
Installed-Size: 808
Maintainer: Ubuntu MOTU Developers <ubuntu-motu@...ts.ubuntu.com>
Original-Maintainer: Robert Luberda <robert@...ian.org>
Architecture: i386
Version: 8.1.2-2ubuntu1
Depends: libc6 (>= 2.4), debconf (>= 0.5) | debconf-2.0, ucf (>= 2.003), lsb-base (>= 3.0-6), bzip2
Recommends: cron
Suggests: isag
Conflicts: atsar (<< 1.5-3)
Filename: pool/main/s/sysstat/sysstat_8.1.2-2ubuntu1_i386.deb
Size: 182222
MD5sum: e59153e0121ce437082ab7e03fe647e0
SHA1: 65383dec2ca6ea4fa5fed41afdde46639d2d5e98
SHA256: eb5530307e52ef69b9d1d3c0e43e7a02e805888e183adcbef272bf9283829851
Description: sar, iostat and mpstat - system performance tools for Linux
 The sysstat package contains the following system performance tools:
  * sar - collects and reports system activity information;
  * iostat - reports CPU utilization and I/O statistics for disks;
  * mpstat - reports global and per-processor statistics;
  * pidstat - reports statistics for Linux tasks (processes);
  * sadf - displays data collected by sar in various formats.
 .
 The statistics reported by sar concern I/O transfer rates,
 paging activity, process-related activities, interrupts,
 network activity, memory and swap space utilization, CPU
 utilization, kernel activities and TTY statistics, among
 others. Both UP and SMP machines are fully supported.
Homepage: http://pagesperso-orange.fr/sebastien.godard/
Bugs: mailto:ubuntu-users@...ts.ubuntu.com
Origin: Ubuntu

						- Ted
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