[lustre-discuss] Fwd: RPCs in Flight are more than the max_rpcs_in_flight value
Md Hasanur Rashid
mrashid2 at uncc.edu
Thu Oct 7 12:19:20 PDT 2021
Hello Everyone,
I am running the Filebench benchmark in my Lustre cluster. I set the
max_rpcs_in_flight value to be 1. Before executing and after executing, I
verified that the value of max_rpcs_in_flight is indeed 1. However, when I
check the rpc_stats, the stat shows a much higher value for RPCs in flight.
Following is the value shown for one OSC just for reference:
osc.hasanfs-OST0000-osc-ffff882fcf777000.rpc_stats=
snapshot_time: 1632483604.967291 (secs.usecs)
read RPCs in flight: 0
write RPCs in flight: 0
pending write pages: 0
pending read pages: 0
read write
pages per rpc rpcs % cum % | rpcs % cum %
1: 1 100 100 | 0 0 0
2: 0 0 100 | 0 0 0
4: 0 0 100 | 0 0 0
8: 0 0 100 | 0 0 0
16: 0 0 100 | 0 0 0
32: 0 0 100 | 0 0 0
64: 0 0 100 | 0 0 0
128: 0 0 100 | 0 0 0
256: 0 0 100 | 9508 100 100
read write
rpcs in flight rpcs % cum % | rpcs % cum %
0: 0 0 0 | 0 0 0
1: 1 100 100 | 10 0 0
2: 0 0 100 | 9033 95 95
3: 0 0 100 | 465 4 100
read write
offset rpcs % cum % | rpcs % cum %
0: 1 100 100 | 725 7 7
1: 0 0 100 | 0 0 7
2: 0 0 100 | 0 0 7
4: 0 0 100 | 0 0 7
8: 0 0 100 | 0 0 7
16: 0 0 100 | 0 0 7
32: 0 0 100 | 0 0 7
64: 0 0 100 | 0 0 7
128: 0 0 100 | 0 0 7
256: 0 0 100 | 718 7 15
512: 0 0 100 | 1386 14 29
1024: 0 0 100 | 2205 23 52
2048: 0 0 100 | 1429 15 67
4096: 0 0 100 | 1103 11 79
8192: 0 0 100 | 1942 20 100
Can anyone please explain to me why the RPCs in flight shown in the
rpc_stats could be higher than the max_rpcs_in_flight?
Thanks,
Md. Hasanur Rashid
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