On 04/20/2011 03:05 PM, Mohit Anchlia wrote:
> Like I mentioned several times my tests are running concurrent threads
> and doing concurrent writes. So overall throughput per sec should be
> atleast 20 X 3 = 60 MB/s.
Get a copy of fio installed (yum install fio), and use the following as
an input file to it. Call it sw_.fio
[sw]
rw=write
size=10g
directory=/data/mnt-stress
iodepth=32
direct=0
blocksize=512k
numjobs=12
nrfiles=1
ioengine=vsync
loops=1
group_reporting
create_on_open=1
create_serialize=0
run this as
fio sw_.fio
then use the following as sr_.fio
[sw]
rw=read
size=10g
directory=/data/mnt-stress
iodepth=32
direct=0
blocksize=512k
numjobs=12
nrfiles=1
ioengine=vsync
loops=1
group_reporting
create_on_open=1
create_serialize=0
run this as
echo 3 > /proc/sys/vm/drop_caches # note the space after "3"
fio sr_.fio
This will run 12 simultaneous IOs, and theoretically distribute across
most of your nodes (with some oversubscription). Please report back the
WRITE: and READ: portions.
Run status group 0 (all jobs):
WRITE: io=122694MB, aggrb=2219.5MB/s, minb=2272.8MB/s,
maxb=2272.8MB/s, mint=55281msec, maxt=55281msec
Run status group 0 (all jobs):
READ: io=122694MB, aggrb=1231.4MB/s, minb=1260.9MB/s,
maxb=1260.9MB/s, mint=99645msec, maxt=99645msec
fio is one of the best load generators out there, and I'd strongly urge
you to leverage it for your tests.
--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
email: landman at scalableinformatics.com
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