I'm Looking for assistance with reading and decoding fio --bandwidth-log.
I've run the below command and the output includes a few columns as listed below, how to read and decode each column?
fio --invalidate=1 --filename=/dev/nvme0n1 --direct=1 --ioengine=libaio --iodepth=32 --time_based --runtime=3600 --bandwidth-log --name=/dev/nvme0n1 --rw=randread --bs=4k --log_avg_msec=1000
Output example (first few lines):
501, 334730, 0, 0, 0
1177, 647294, 0, 0, 0
1678, 985860, 0, 0, 0
2180, 948023, 0, 0, 0
2681, 967369, 0, 0, 0
3182, 977405, 0, 0, 0
3683, 982035, 0, 0, 0
- How to read the 1st column? No matter what period I provide for --timebased I get 1024 results in total.
- The 2nd column doesn't fit IOPS, nor BW in MB/s. I read somewhere that it is in KB/s and tried conversion which provides reasonable MB/s in some cases but doesn't mix RW commands.
If I read the fio man page it is only mention the below with no explanation:
--bandwidth-log
Generate aggregate bandwidth logs.
