Hi Stefan,
Could you try running your random write workload against bluestore and
then take a wallclock profile of an OSD using gdbpmp? It's available here:
https://github.com/markhpc/gdbpmp
Thanks,
Mark
On 3/5/19 2:29 AM, Stefan Priebe - Profihost AG wrote:
Hello list,
while the performance of sequential writes 4k on bluestore is very high
and even higher than filestore i was wondering what i can do to optimize
random pattern as well.
While using:
fio --rw=write --iodepth=32 --ioengine=libaio --bs=4k --numjobs=4
--filename=/tmp/test --size=10G --runtime=60 --group_reporting
--name=test --direct=1
I get 36000 iop/s on bluestore while having 11500 on filestore.
Using randwrite gives me 17000 on filestore and only 9500 on bluestore.
This is on all flash / ssd running luminous 12.2.10.
Greets,
Stefan
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