I think there have been improvements here to use special instructions to do the increments instead of taking spin-locks and doing increments. So may be it doesn't affect performance as much anymore. I think if you don't see a difference, then the enhancements are doing a good job :-).
Which version of gluster are you using?On Mon, Jun 5, 2017 at 8:09 AM, Xie Changlong <xiechanglong.d@xxxxxxxxx> wrote:
Hi all
It's said[1] that profile based on io-stats, if you enable this feature, it can affect system performance while the profile information is being collected.
I do some tests on my two linux+vmware virtual machine with replica(lack of resources ). And the results shows no diffrence to me, following is the test case
#dd if=/dev/zero of=test bs=4k count=524288
#fio --filename=test -iodepth=64 -ioengine=libaio --direct=1 --rw=read --bs=1m --size=2g --numjobs=4 --runtime=10 --group_reporting --name=test-read
#fio -filename=test -iodepth=64 -ioengine=libaio -direct=1 -rw=write -bs=1m -size=2g -numjobs=4 -runtime=20 -group_reporting -name=test-write
#fio -filename=test -iodepth=64 -ioengine=libaio -direct=1 -rw=randread -bs=4k -size=2G -numjobs=64 -runtime=20 -group_reporting -name=test-rand-read
#fio -filename=test -iodepth=64 -ioengine=libaio -direct=1 -rw=randwrite -bs=4k -size=2G -numjobs=64 -runtime=20 -group_reporting -name=test-rand-write
It's said that fio is only for lagre files, also i suspect that the test infrastructure is too small. The question is that, if you guys have detailed data for how profile affect performance?
More, we wanna gain the detail r/w iops/bandwidth data for each brick. It seems that only profile can provide relatived data to be calculated?if i'm wrong pls corrent me.
If profile really affect peformance so much, would you mind a new command such as "gluster volume io [nfs]" to acquire brick r/w fops/data? Or just help us review it?
[1] https://access.redhat.com/documentation/en-us/red_hat_gluste r_storage/3.2/html/administrat ion_guide/chap-monitoring_red_ hat_storage_workload#sect- Running_the_Volume_Profile_ Command
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Thanks
-Xie
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Pranith
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