Inconsency between cli output and gnuplot
My 1.23 fio ouput display :
read : io=32,003MiB, bw=131MiB/s, iops=1,362, runt=250326msec
slat (usec): min=13, max=145, avg=16.69, stdev= 3.39 clat (msec): min=31, max=129, avg=46.94, stdev= 7.24
clat output of gnuplot reports units in msec. The clat gnuplot output show a msec label on the y axis but trace some usec.
slat cli reports values that doesn't match at all what is viewable from gnuplot output. Averagage is said to be 16 on the cli whereas the gnuplot trace shows 20 at min. Max is said to be 145 for slat but displayed at 60 on the gnuplot.
Slat is also said to be usec on the cli but shown as msec on the y axis of the gnuplot.
Complete archive showing that could be downloaded at http://konilope.linuxeries.org/tmp/localr.tar.bz2
It seems that units may vary from the cli output regarding the range of results. I have some case where clat is shown in usec instead of msec. Maybe that what confuse the gnuplot output. Like in :
write: io=32,003MiB, bw=124MiB/s, iops=1,294, runt=263681msec
slat (usec): min=12, max=71, avg=15.43, stdev= 2.72
clat (usec): min=663, max=1,537K, avg=49431.63, stdev=108787.82
bw (KiB/s) : min= 0, max=171311, per=99.91%, avg=127152.93,
stdev=21619.46
Signature · 5 lines
Erwan Velu Pre-Sales Engineer Seanodes http://www.seanodes.com +33 (0)1 41 22 13 83
Quoted 14 lines · Erwan Velu
My 1.23 fio ouput display :
read : io=32,003MiB, bw=131MiB/s, iops=1,362, runt=250326msec
slat (usec): min=13, max=145, avg=16.69, stdev= 3.39 clat (msec): min=31, max=129, avg=46.94, stdev= 7.24clat output of gnuplot reports units in msec. The clat gnuplot output show a msec label on the y axis but trace some usec.
slat cli reports values that doesn't match at all what is viewable from gnuplot output. Averagage is said to be 16 on the cli whereas the gnuplot trace shows 20 at min. Max is said to be 145 for slat but displayed at 60 on the gnuplot.
Slat is also said to be usec on the cli but shown as msec on the y axis of the gnuplot.Complete archive showing that could be downloaded at http://konilope.linuxeries.org/tmp/localr.tar.bz2
Quoted 8 lines
It seems that units may vary from the cli output regarding the range of results. I have some case where clat is shown in usec instead of msec. Maybe that what confuse the gnuplot output. Like in :
write: io=32,003MiB, bw=124MiB/s, iops=1,294, runt=263681msec
slat (usec): min=12, max=71, avg=15.43, stdev= 2.72
clat (usec): min=663, max=1,537K, avg=49431.63, stdev=108787.82
bw (KiB/s) : min= 0, max=171311, per=99.91%, avg=127152.93,
stdev=21619.46
What's your opinion on that ?
Signature · 5 lines
Erwan Velu Pre-Sales Engineer Seanodes http://www.seanodes.com +33 (0)1 41 22 13 83
Quoted 8 lines · Erwan Velu
My 1.23 fio ouput display :
read : io=32,003MiB, bw=131MiB/s, iops=1,362, runt=250326msec
slat (usec): min=13, max=145, avg=16.69, stdev= 3.39 clat (msec): min=31, max=129, avg=46.94, stdev= 7.24clat output of gnuplot reports units in msec. The clat gnuplot output show a msec label on the y axis but trace some usec.
The fio_generate_plots doesn't take the usec vs msec into account, it's basically hard wired. If someone wants to improve the script for better reporting I'd be happy to take it, it's mainly considered an example of how to do the reporting quickly.
Quoted 10 lines
slat cli reports values that doesn't match at all what is viewable from gnuplot output. Averagage is said to be 16 on the cli whereas the gnuplot trace shows 20 at min.
Max is said to be 145 for slat but displayed at 60 on the gnuplot. Slat is also said to be usec on the cli but shown as msec on the y axis of the gnuplot.Complete archive showing that could be downloaded at
http://konilope.linuxeries.org/tmp/localr.tar.bz2
Quoted 9 lines
It seems that units may vary from the cli output regarding the range of results. I have some case where clat is shown in usec instead of msec. Maybe that what confuse the gnuplot output.
Like in :
write: io=32,003MiB, bw=124MiB/s, iops=1,294, runt=263681msec
slat (usec): min=12, max=71, avg=15.43, stdev= 2.72
clat (usec): min=663, max=1,537K, avg=49431.63, stdev=108787.82
bw (KiB/s) : min= 0, max=171311, per=99.91%, avg=127152.93,
stdev=21619.46
I'll take a look at this.
Signature · 1 line
Jens Axboe
Quoted 20 lines · Jens Axboe
Quoted 10 lines
slat cli reports values that doesn't match at all what is viewable from gnuplot output. Averagage is said to be 16 on the cli whereas the gnuplot trace shows 20 at min.
Max is said to be 145 for slat but displayed at 60 on the gnuplot. Slat is also said to be usec on the cli but shown as msec on the y axis of the gnuplot.Complete archive showing that could be downloaded at
http://konilope.linuxeries.org/tmp/localr.tar.bz2Quoted 9 lines
It seems that units may vary from the cli output regarding the range of results. I have some case where clat is shown in usec instead of msec. Maybe that what confuse the gnuplot output.
Like in :
write: io=32,003MiB, bw=124MiB/s, iops=1,294, runt=263681msec
slat (usec): min=12, max=71, avg=15.43, stdev= 2.72
clat (usec): min=663, max=1,537K, avg=49431.63, stdev=108787.82
bw (KiB/s) : min= 0, max=171311, per=99.91%, avg=127152.93,
stdev=21619.46
Quoted 1 line
I'll take a look at this.
It's weird, must be some gnuplot oddity. The data points are definitely there and the range of the y-axis reflects this as well, however it seems to be missing in the output. I've tried increasing the resolution, but it doesn't change this fact.
Signature · 1 line
Jens Axboe