(2013/06/26 20:15), Heikki Linnakangas wrote:
On 26.06.2013 11:37, KONDO Mitsumasa wrote:
On Tue, Jun 25, 2013 at 1:15 PM, Heikki Linnakangas
Hmm, so the write patch doesn't do much, but the fsync patch makes
the response
times somewhat smoother. I'd suggest that we drop the write patch
for now, and focus on the fsyncs.

Write patch is effective in TPS!

Your test results don't agree with that. You got 3465.96 TPS with the write
patch, and 3474.62 and 3469.03 without it. The fsync+write combination got
slightly more TPS than just the fsync patch, but only by about 1%, and then the
response times were worse.
Please see result of DBT-2 more careful. Average latency in fsync+write was
improoved from only fsync patch. 90% tile and Maximum latency are not all of
result but only part of result in DBT-2. And Average and TPS are all of result. Generally, when TPS become high in benchmark, checkpointer has to write more pages. Therefore, 90%tile and Maximum are worse in this case, and it is general in other benchmark tests.

Best regards,
Mitsumasa KONDO
NTT Open Source Software Center

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