From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
---|---|
To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
Cc: | Scott Carey <scott(at)richrelevance(dot)com>, "david(at)lang(dot)hm" <david(at)lang(dot)hm>, Greg Smith <greg(at)2ndquadrant(dot)com>, Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>, Karl Denninger <karl(at)denninger(dot)net>, Laszlo Nagy <gandalf(at)shopzeus(dot)com>, pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: SSD + RAID |
Date: | 2009-11-19 17:19:32 |
Message-ID: | dcc563d10911190919g6271d326g8bf3820fb0308fd1@mail.gmail.com |
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Lists: | pgsql-performance |
On Thu, Nov 19, 2009 at 10:01 AM, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
> On Wed, Nov 18, 2009 at 11:39 PM, Scott Carey <scott(at)richrelevance(dot)com> wrote:
>> Well, that is sort of true for all benchmarks, but I do find that bonnie++
>> is the worst of the bunch. I consider it relatively useless compared to
>> fio. Its just not a great benchmark for server type load and I find it
>> lacking in the ability to simulate real applications.
>
> I agree. My biggest gripe with bonnie actually is that 99% of the
> time is spent measuring in sequential tests which is not that
> important in the database world. Dedicated wal volume uses ostensibly
> sequential io, but it's fairly difficult to outrun a dedicated wal
> volume even if it's on a vanilla sata drive.
>
> pgbench is actually a pretty awesome i/o tester assuming you have big
> enough scaling factor, because:
> a) it's much closer to the environment you will actually run in
> b) you get to see what i/o affecting options have on the load
> c) you have broad array of options regarding what gets done (select
> only, -f, etc)
> d) once you build the test database, you can do multiple runs without
> rebuilding it
Seeing as how pgbench only goes to scaling factor of 4000, are the any
plans on enlarging that number?
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