no slat log
Hi,
when I try to create logs with fio I get bw, iops, lat, clat and slat logs but the slat log always has a size of 0 bytes. Is this a bug or is data for this log only generated with specific options for fio?
Regards,
Dennis
Quoted 3 lines · Dennis Jacobfeuerborn
Hi,
when I try to create logs with fio I get bw, iops, lat, clat and slat logs but the slat log always has a size of 0 bytes. Is this a bug or is data for this log only generated with specific options for fio?
Dennis,
I've been trying this on my 2.1.2 with the following job :
[read-sda-4k-para]
bs=4k
filename=/dev/sda
rw=read
write_lat_log=lat.log
On my side, the slat file is perfectly filled.
Can you provide a testing procedure & the version you use ?
Cheers,
Quoted 16 lines · Erwan Velu
Quoted 5 lines · Dennis Jacobfeuerborn
Hi,
when I try to create logs with fio I get bw, iops, lat, clat and slat logs but the slat log always has a size of 0 bytes. Is this a bug or is data for this log only generated with specific options for fio?Dennis,
I've been trying this on my 2.1.2 with the following job :
[read-sda-4k-para]
bs=4k
filename=/dev/sda
rw=read
write_lat_log=lat.log
Quoted 3 lines
On my side, the slat file is perfectly filled.
Can you provide a testing procedure & the version you use ?
I just tested the job above and these are the files produced:
[dennis@nexus fio]$ ls -l
total 11272
-rw-r--r--. 1 root root 5767080 7. Aug 12:31 lat.log_clat.log -rw-r--r--. 1 root root 5767087 7. Aug 12:31 lat.log_lat.log -rw-r--r--. 1 root root 0 7. Aug 12:31 lat.log_slat.log -rw-rw-r--. 1 dennis dennis 84 7. Aug 12:31 logtest.fio
There are not errors or warnings during the fio run so it's not clear why the file ends up being empty.
Regards,
Dennis
Quoted 11 lines · Dennis Jacobfeuerborn
I just tested the job above and these are the files produced:
[dennis@nexus fio]$ ls -l
total 11272(quoted diff) +0
-4-rw-r--r--. 1 root root 5767080 7. Aug 12:31 lat.log_clat.log -rw-r--r--. 1 root root 5767087 7. Aug 12:31 lat.log_lat.log -rw-r--r--. 1 root root 0 7. Aug 12:31 lat.log_slat.log -rw-rw-r--. 1 dennis dennis 84 7. Aug 12:31 logtest.fioThere are not errors or warnings during the fio run so it's not clear why the file ends up being empty.
Are you running 2.1.2 ?
If so, can you provides the complete output of fio while running ?
Cheers,
Quoted 30 lines · Dennis Jacobfeuerborn
Quoted 16 lines · Erwan Velu
Quoted 5 lines · Dennis Jacobfeuerborn
Hi,
when I try to create logs with fio I get bw, iops, lat, clat and slat logs but the slat log always has a size of 0 bytes. Is this a bug or is data for this log only generated with specific options for fio?Dennis,
I've been trying this on my 2.1.2 with the following job :
[read-sda-4k-para]
bs=4k
filename=/dev/sda
rw=read
write_lat_log=lat.logQuoted 3 lines
On my side, the slat file is perfectly filled.
Can you provide a testing procedure & the version you use ?
I just tested the job above and these are the files produced:
[dennis@nexus fio]$ ls -l
total 11272(quoted diff) +0
-4-rw-r--r--. 1 root root 5767080 7. Aug 12:31 lat.log_clat.log -rw-r--r--. 1 root root 5767087 7. Aug 12:31 lat.log_lat.log -rw-r--r--. 1 root root 0 7. Aug 12:31 lat.log_slat.log -rw-rw-r--. 1 dennis dennis 84 7. Aug 12:31 logtest.fio
Quoted 2 lines
There are not errors or warnings during the fio run so it's not clear why the file ends up being empty.
slat only exists for async IO engines. For a sync workload, submission and completion retrieval are not separate events, so you cannot do split submission + completion stats.
Signature · 1 line
Jens Axboe