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Re: Postgres benchmarking with pgbench

From: "Jignesh K(dot) Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM>
To: "ml(at)bortal(dot)de" <ml(at)bortal(dot)de>
Cc: Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Postgres benchmarking with pgbench
Date: 2009-03-19 23:28:19
Message-ID: 49C2D513.6090002@sun.com (view raw or flat)
Thread:
Lists: pgsql-performance

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


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