From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | David Boreham <david_list(at)boreham(dot)org> |
Cc: | PGSQL Performance <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Benchmarking a large server |
Date: | 2011-05-09 21:11:55 |
Message-ID: | BANLkTimuX772unQsOhCsU9voAY_oERs4fg@mail.gmail.com |
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Lists: | pgsql-performance |
On Mon, May 9, 2011 at 3:59 PM, David Boreham <david_list(at)boreham(dot)org> wrote:
>
>> hm, if it was me, I'd write a small C program that just jumped
>> directly on the device around and did random writes assuming it wasn't
>> formatted. For sequential read, just flush caches and dd the device
>> to /dev/null. Probably someone will suggest better tools though.
>
> I have a program I wrote years ago for a purpose like this. One of the
> things it can
> do is write to the filesystem at the same time as dirtying pages in a large
> shared
> or non-shared memory region. The idea was to emulate the behavior of a
> database
> reasonably accurately. Something like bonnie++ would probably be a good
> starting
> point these days though.
The problem with bonnie++ is that the results aren't valid, especially
the read tests. I think it refuses to even run unless you set special
switches.
merlin
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