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 <[email protected]> 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 _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
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