Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

Jens Axboe
2007-02-26T13:59:41Z

Some more results, using a larger number of processes and io depths. A
repeat of the tests from friday, with added depth 20000 for syslet and
libaio:

Engine Depth Processes Bw (MiB/sec)
----------------------------------------------------
libaio 1 1 602
syslet 1 1 759
sync 1 1 776
libaio 32 1 832
syslet 32 1 898
libaio 20000 1 581
syslet 20000 1 609

syslet still on top. Measuring O_DIRECT reads (of 4kb size) on ramfs
with 100 processes each with a depth of 200, reading a per-process
private file of 10mb (need to fit in my ram...) 10 times each. IOW,
doing 10,000MiB of IO in total:

Engine Depth Processes Bw (MiB/sec)
----------------------------------------------------
libaio 200 100 1488
syslet 200 100 1714

Results are stable to within approx +/- 10MiB/sec. The syslet case
completes a whole second faster than libaio (~6 vs ~7 seconds). Testing
was done with fio HEAD eb7c8ae27bc301b77490b3586dd5ccab7c95880a, and it
uses the v4 patch series.

Engine Depth Processes Bw (MiB/sec)
----------------------------------------------------
libaio 200 100 1488
syslet 200 100 1714
sync 200 100 1843

--
Jens Axboe