Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets",generic AIO support, v3)
From: Avi Kivity
Date: Tue Feb 27 2007 - 11:17:35 EST
Ingo Molnar wrote:
* Avi Kivity <avi@xxxxxxxxxx> wrote:
But what about cpu usage? At these low levels, the cpu is probably
underutilized. It would be interesting to measure cpu time per I/O
request (or, alternatively, use an I/O subsystem that can saturate the
yeah - that's what testing on ramdisk (Jens') or on a loopback block
device (mine) approximates to a certain degree.
Ramdisks or fully cached loopback return immediately, so cache thrashing
effects don't show up.
Maybe a device mapper delay target or nbd + O_DIRECT can insert delays
to make the workload more disk-like.
error compiling committee.c: too many arguments to function
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