[lustre-discuss] No read throughput shown for the sequential read write Filebench workload
Andreas Dilger
adilger at whamcloud.com
Sat Oct 16 00:49:47 PDT 2021
I would guess that all of the reads are handled from the client page cache?
Cheers, Andreas
On Oct 13, 2021, at 06:37, Md Hasanur Rashid via lustre-discuss <lustre-discuss at lists.lustre.org> wrote:
Hello Everyone,
I am running a Filebench workload which is provided below:
define fileset name="testF",entries=100,filesize=16m,prealloc,path="/mnt/hasanfs/tmp1"
define process name="readerP",instances=2 {
thread name="readerT",instances=4 {
flowop openfile name="openOP",filesetname="testF"
flowop writewholefile name="writeOP",iters=4,filesetname="testF"
flowop readwholefile name="readOP",iters=1,filesetname="testF"
flowop closefile name="closeOP"
}
}
create files
system "sync"
system "echo 3 > /proc/sys/vm/drop_caches"
run 60
I am running the workload in a Lustre cluster. When I check the log from the server-side, it shows the following (I have provided stats of one OSS):
obdfilter.hasanfs-OST0000.stats=
snapshot_time 1633361244.519122 secs.usecs
read_bytes 1 samples [bytes] 4096 4096 4096
write_bytes 8479 samples [bytes] 1048576 1048576 8890875904
destroy 13 samples [reqs]
statfs 76 samples [reqs]
preprw 8480 samples [reqs]
commitrw 8480 samples [reqs]
ping 57 samples [reqs]
obdfilter.hasanfs-OST0000.brw_stats=
snapshot_time: 1633361244.519588 (secs.usecs)
read | write
pages per bulk r/w rpcs % cum % | rpcs % cum %
256: 0 0 0 | 8479 100 100
read | write
discontiguous pages rpcs % cum % | rpcs % cum %
0: 0 0 0 | 8479 100 100
read | write
discontiguous blocks rpcs % cum % | rpcs % cum %
0: 0 0 0 | 8479 100 100
read | write
disk fragmented I/Os ios % cum % | ios % cum %
1: 0 0 0 | 7499 88 88
2: 0 0 0 | 980 11 100
read | write
disk I/Os in flight ios % cum % | ios % cum %
1: 0 0 0 | 7921 83 83
2: 0 0 0 | 1407 14 98
3: 0 0 0 | 116 1 99
4: 0 0 0 | 15 0 100
read | write
I/O time (1/1000s) ios % cum % | ios % cum %
2: 0 0 0 | 1963 23 23
4: 0 0 0 | 5627 66 89
8: 0 0 0 | 837 9 99
16: 0 0 0 | 25 0 99
32: 0 0 0 | 27 0 100
read | write
disk I/O size ios % cum % | ios % cum %
4K: 0 0 0 | 62 0 0
8K: 0 0 0 | 127 1 1
16K: 0 0 0 | 113 1 3
32K: 0 0 0 | 0 0 3
64K: 0 0 0 | 0 0 3
128K: 0 0 0 | 65 0 3
256K: 0 0 0 | 0 0 3
512K: 0 0 0 | 1127 11 15
1M: 0 0 0 | 7965 84 100
Can anyone please explain to me why I am not seeing any read operations in the stats?
Thanks,
Md. Hasanur Rashid
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