sdev qdepth fio number jobs* 1 10 20
16 1590 1654 1660
32 1545 1646 1654
64 1436 1085 1070
254 (default) 1436 1070 1050
What does the performance number mean? IOPS or others? What is the fio
io test? random IO or sequential IO?
So those figures are x1K IOPs read performance; so 1590, above, is 1.59M
IOPs read. Here's the fio script:
[global]
rw=read
direct=1
ioengine=libaio
iodepth=40
numjobs=20
bs=4k
;size=10240000m
;zero_buffers=1
group_reporting=1
;ioscheduler=noop
;cpumask=0xffe
;cpus_allowed=1-47
;gtod_reduce=1
;iodepth_batch=2
;iodepth_batch_complete=2
runtime=60
;thread
loops = 10000
Is there any effect on random read IOPS when you decrease sdev queue
depth? For sequential IO, IO merge can be enhanced by that way.
Hi Ming,
fio randread results:
fio queue depth 40
sdev qdepth fio number jobs* 1 10 20
8 1308K 831K 814K
16 1435K 1073K 988K
32 1438K 1065K 990K
64 1432K 1061K 1020K
254 (default) 1439K 1099K 1083K
fio queue depth 128
sdev qdepth fio number jobs* 1 10 20
8 1310K 860K 849K
16 1435K 1048K 958K
32 1438K 1140K 951K
64 1438K 1065K 953k
254 (default) 1439K 1140K 1056K
So randread goes in the opposite direction (to read wrt queue depth).
Thanks,
John
