Brian Hurt wrote:
I'm having a spot of problem with out storage device vendor. Read
performance (as measured by both bonnie++ and hdparm -t) is abysmal
(~14Mbyte/sec), and we're trying to get them to fix it. Unfortunately,
they're using the fact that bonnie++ is an open source benchmark to
weasle out of doing anything- they can't fix it unless I can show an
impact in Postgresql.
So the question is: is there an easy to install and run, read-heavy
benchmark out there that I can wave at them to get them to fix the
problem? I have a second database running on a single SATA drive, so I
can use that as a comparison point- "look, we're getting 1/3rd the read
speed of a single SATA drive- this sucks!"
You could use the lineitem table from the TPC-H dataset
(http://www.tpc.org/tpch/default.asp).
Generate the dataset for a scale factor that makes lineitem about 2x
your ram, load the table and do:
SELECT count(*) FROM lineitem
vmstat or iostat while this is happening should display your meager
throughput well enough to get your vendors attention (I'm checking this
on a fairly old 4 disk system of mine as I type this - I'm seeing about
90Mb/s...)
best wishes
Mark
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