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DateFri, 27 Feb 2004 09:03:58 -0800 (PST)
From markw@osdl ...
SubjectRe: AS performance with reiser4 on 2.6.3
On 27 Feb, Hans Reiser wrote:
> Nikita Danilov wrote:
>
>>markw@osdl.org writes:
>> > Hi Nick,
>> >
>> > I started getting some results with dbt-2 on 2.6.3 and saw that reiser4
>> > is doing a bit worse with the AS elevator. Although reiser4 wasn't
>> > doing well to begin with, compared to the other filesystems. I have
>> > links to the STP results on our 4-ways and 8-ways here:
>> > http://developer.osdl.org/markw/fs/dbt2_stp_results.html
>>
>>There were no changes between 2.6.2 and 2.6.3 that could affect reiser4
>>performance, so it is not clear why numbers are so different. Probably
>>results should be averaged over several runs.
>>
> The differences don't "feel" like testing error, and in any event
> something is seriously wrong. That something is either poor fsync
> performance, or poor scalability. In any event, please investigate, and
> please try such things as using capture on copy. Mark, does this
> benchmark like to use fsync?
>
> Thanks much mark for bringing this to our attention.

Yes, PostgreSQL uses fsync for its database logging. I can certainly
enable the capture on copy option. Does that produce something that I
need to manually capture?

Mark
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