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Re: Identifying the nature of blocking I/O

From: "Alexander Staubo" <alex(at)bengler(dot)no>
To: "Scott Carey" <scott(at)richrelevance(dot)com>
Cc: pgsql-performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Identifying the nature of blocking I/O
Date: 2008-08-25 08:18:24
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Mon, Aug 25, 2008 at 3:34 AM, Scott Carey <scott(at)richrelevance(dot)com> wrote:
> DTrace is available now on MacOSX, Solaris 10, OpenSolaris, and FreeBSD.
> Linux however is still in the dark ages when it comes to system monitoring,
> especially with I/O.

While that's true, newer 2.6 kernel versions at least have I/O
accounting built in, something which only used to be available through
the "atop" accounting kernel patch:

$ cat /proc/22785/io
rchar: 31928
wchar: 138
syscr: 272
syscw: 4
read_bytes: 0
write_bytes: 0
cancelled_write_bytes: 0


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