Messages in this thread |  | | | Date | Fri, 27 Feb 2004 09:03:58 -0800 (PST) | | From | markw@osdl ... | | Subject | Re: AS performance with reiser4 on 2.6.3 |
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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?
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