Re: Postgres benchmarking with pgbench

ml(at)bortal(dot)de wrote:
> Hi Greg,
>
> thanks a lot for your hints. I changed my config and changed raid6 to
> raid10, but whatever i do, the benchmark breaks down at a scaling
> factor 75 where the database is "only" 1126MB big.
>
> Here are my benchmark Results (scaling factor, DB size in MB, TPS) using:
> pgbench -S -c X -t 1000 -U pgsql -d benchmark -h MYHOST
>
> 1 19 8600
> 5 79 8743
> 10 154 8774
> 20 303 8479
> 30 453 8775
> 40 602 8093
> 50 752 6334
> 75 1126 3881
> 150 2247 2297
> 200 2994 701
> 250 3742 656
> 300 4489 596
> 400 5984 552
> 500 7479 513
>
> I have no idea if this is any good for a QuardCore Intel(R) Xeon(R)
> CPU E5320 @ 1.86GHz with 4GB Ram and 6 SATA disk (7200rpm) in raid 10.
>
> Here is my config (maybe with some odd setting):
> http://pastebin.com/m5d7f5717
>
> I played around with:
> - max_connections
> - shared_buffers
> - work_mem
> - maintenance_work_mem
> - checkpoint_segments
> - effective_cache_size
>
> ..but whatever i do, the graph looks the same. Any hints or tips what
> my config should look like? Or are these results even okay? Maybe i am
> driving myself crazy for nothing?
>
Are you running the pgbench client from a different system? Did you
check if the pgbench client itself is bottlenecked or not. I have seen
before the client of pgbench is severely limited on the load it can
drive and process.

-Jignesh