Mark Kirkwood wrote:
Ivan Voras wrote:
The thing is - I *do* have a similar setup here: HP DL370 G5, 2x4-core
1.86 GHz, 4 GB RAM, 6 drives in RAID10, 512 MB cache (can pull > 200
MB/s off the array), with all settings like in the posted link except
shared_buffer=1900 MB, and I "only" get this:
tps = 2834.026175 (including connections establishing)
tps = 2839.080739 (excluding connections establishing)
This is still far bellow ~~ 4500 trans/s from the link and I wonder if
my results are within what I should be getting. The benchmark in the
link above was done with faster CPUs (but I'm not CPU bound - at least
30% idle), but with 3 times the memory and I'm guessing more memory
would help here, but I'm not sure.
What's strange is that toggling synchronous_commit doesn't have a
significant effect on performance (it does increase CPU idle time). With
synchronous_commit=off, I get:
tps = 2886.980477 (including connections establishing)
tps = 2891.776081 (excluding connections establishing)
The article refers to a controller with a battery backed write cache -
that could easily explain the difference if you do not have one (he's
paying nothing for fsync wheres you are).
Hmm - somehow read right past the bit where you say you have a 512MB
cache - sorry! However, worth checking it is set to write-back rather
than write-through.
Cheers
Mark
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