Re: memory caching

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On 2011-03-15 21:54, N. Harake wrote:
> Things improved but maybe too much :), I was expecting a 100K IOPS not more
> server1:~ # fio --name=job --directory=/lvm --size=1G --filesize=1G --iodepth=128 --iodepth_batch_complete=8 --iodepth_batch_submit=8 --ioengine=libaio --direct=1 --numjobs=64 --bs= 4096 --rw=randwrite --group_reporting
> Jobs: 50 (f=50): [wwwwww_wwwwwww_wwwwwwwwww_wwwwwwwwwww_www_www_ww_www___ww_w__w_w] [98.3% done] [0K/570.8M /s] [0 /143K iops] [eta 00m:02s]
>   write: io=65536MB, bw=584771KB/s, iops=146192 , runt=114761msec

If you use numjobs=64, you probably don't want 128 for io depth. Not
very realistic, and you'll likely end up running slower than you could.

Jens Axboe

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