Am 13.11.2012 09:20, schrieb Josh Durgin:
On 11/12/2012 11:55 PM, Stefan Priebe wrote: rados bench uses librados aio, keeping several operations in flight. IO size is the same as object size for it.You can do a 4k write benchmark that doesn't delete the objects it writes, with 32 IOs in flight for 300 seconds: rados -p data bench 300 write -b 4096 -t 32 --no-cleanup
This gives me just 9000 iop/s - callgraph attached.
Then a read benchmark (only sequential is implemented, but with 4k objects it's similar to random if you flush the osd's page cache before running it): rados -p data bench 300 seq -b 4096 -t 32
This gives me 43 000 iops. But i'm sure readahead or a buffer is the burst here.
Greets, Stefan
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