Vladislav Bolkhovitin wrote:
Cameron Harr wrote:
Ok, I've done some testing with elevator=noop, with
scst_threads=[123] and srpt thread=[01]. I ran with both 4k blocks
and 512B blocks, random writes with 60s per test. Unfortunately, it
looks like I can't seem to reproduce the numbers I had before - I
believe the reporting mechanism I used earlier (script that uses
/proc/diskstats) gave me invalid results. This time I have calculated
iops straight from the FIO results. One interesting note is that in
almost every case srpt thread=1 gives better performance.
Strange, indeed.
Do you use the latest SVN trunk?
Almost - it was svn rev 532.
Did you use the real drives or NULLIO?
Real drives
What is your FIO script?
A variation on this:
fio/fio --rw=randwrite --bs=512 --size=20G --loops=10
--name=randwrite_512_sdc --numjobs=64 --runtime=60 --direct=1
--group_reporting --randrepeat=0 --softrandommap=1 --ioengine=libaio
--iodepth=16 --filename=/dev/sdb --filename=/dev/sdc
How do you calculate IOPS rate?
I divide the sum (if more than 1) of the "ios=" from a particular test
by the runtime.
It would be interesting to know "vmstat 1" and "top d1" output during
runs. Top should show stats for all CPUs, not only aggregate value.
type=randwrite bs=4k drives=1 scst_threads=1 srptthread=0
iops=51134.20
type=randwrite bs=4k drives=1 scst_threads=1 srptthread=1
iops=63461.86
type=randwrite bs=4k drives=1 scst_threads=2 srptthread=0
iops=52383.10
type=randwrite bs=4k drives=1 scst_threads=2 srptthread=1
iops=54065.52
type=randwrite bs=4k drives=1 scst_threads=3 srptthread=0
iops=48827.27
type=randwrite bs=4k drives=1 scst_threads=3 srptthread=1
iops=52703.82
type=randwrite bs=4k drives=2 scst_threads=1 srptthread=0
iops=64619.11
type=randwrite bs=4k drives=2 scst_threads=1 srptthread=1
iops=62605.09
type=randwrite bs=4k drives=2 scst_threads=2 srptthread=0
iops=67961.56
type=randwrite bs=4k drives=2 scst_threads=2 srptthread=1
iops=78884.72
type=randwrite bs=4k drives=2 scst_threads=3 srptthread=0
iops=70340.04
type=randwrite bs=4k drives=2 scst_threads=3 srptthread=1
iops=76253.60
type=randwrite bs=4k drives=3 scst_threads=1 srptthread=0
iops=53777.02
type=randwrite bs=4k drives=3 scst_threads=1 srptthread=1
iops=64661.21
type=randwrite bs=4k drives=3 scst_threads=2 srptthread=0
iops=91073.05
type=randwrite bs=4k drives=3 scst_threads=2 srptthread=1
iops=90127.98
type=randwrite bs=4k drives=3 scst_threads=3 srptthread=0
iops=92012.13
type=randwrite bs=4k drives=3 scst_threads=3 srptthread=1
iops=96848.61
type=randwrite bs=512 drives=1 scst_threads=1 srptthread=0
iops=55040.20
type=randwrite bs=512 drives=1 scst_threads=1 srptthread=1
iops=62057.33
type=randwrite bs=512 drives=1 scst_threads=2 srptthread=0
iops=60237.05
type=randwrite bs=512 drives=1 scst_threads=2 srptthread=1
iops=63465.54
type=randwrite bs=512 drives=1 scst_threads=3 srptthread=0
iops=58716.01
type=randwrite bs=512 drives=1 scst_threads=3 srptthread=1
iops=60089.11
type=randwrite bs=512 drives=2 scst_threads=1 srptthread=0
iops=64978.41
type=randwrite bs=512 drives=2 scst_threads=1 srptthread=1
iops=64018.47
type=randwrite bs=512 drives=2 scst_threads=2 srptthread=0
iops=78128.56
type=randwrite bs=512 drives=2 scst_threads=2 srptthread=1
iops=94561.47
type=randwrite bs=512 drives=2 scst_threads=3 srptthread=0
iops=82526.52
type=randwrite bs=512 drives=2 scst_threads=3 srptthread=1
iops=105874.51
type=randwrite bs=512 drives=3 scst_threads=1 srptthread=0
iops=56730.70
type=randwrite bs=512 drives=3 scst_threads=1 srptthread=1
iops=62147.04
type=randwrite bs=512 drives=3 scst_threads=2 srptthread=0
iops=87507.15
type=randwrite bs=512 drives=3 scst_threads=2 srptthread=1
iops=95781.40
type=randwrite bs=512 drives=3 scst_threads=3 srptthread=0
iops=91645.99
type=randwrite bs=512 drives=3 scst_threads=3 srptthread=1
iops=114164.39
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