FYI I found the problem in fio/backend.c. Seems to be working fine now.
The fix I put together is this:
if (td_read(td) && td->io_bytes[DDIR_READ]) {
elapsed = utime_since_now(&td->start);
td->ts.runtime[DDIR_READ] += elapsed/1000;
}
if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
elapsed = utime_since_now(&td->start);
td->ts.runtime[DDIR_WRITE] += elapsed/1000;
}
if (td_trim(td) && td->io_bytes[DDIR_TRIM]) {
elapsed = utime_since_now(&td->start);
td->ts.runtime[DDIR_TRIM] += elapsed/1000;
}
The problem is is that runtime is holding milliseconds but
utime_since_now() returns microseconds. I added the "/1000" to make the
conversion.
My change is a simple fix but quite possibly there are other places
within fio making the same mistake?
J
On 14/08/14 13:25, John OCallaghan wrote:
>
>
> Hi
>
> I am running the fio2.1.11 and am seeing something odd with the "runt"
> value on jobs.
>
> If I run a test with "--status-interval=5" and let it run for over 20
> seconds I see the runt go from sensible values to nonsensical values
> once it reaches the 20 second boundary.
>
> Below is a snip from a log that I took. Notice that at the 19 second
> boundary the runt is OK (19925msec). But at the next status interval the
> runt has grown from 19 seconds to 21009 seconds!
>
> This throws out the bw calcs (1505KB/s down to 1900B/s).
>
> Here is my fio config file
> [global]
> time_based=1
> runtime=180
> directory=.
> size=64m
>
> [job1-HD-ReadWrite]
> rw=readwrite
> blocksize=1500k
> filename=HDRW.STR
> rate=1500k,1500k
>
> And I run as follows:
>
> ./fio --status-interval=5 test.fio
>
>
> Hope thats useful to someone!
> John
>
> ----------------------
>
> job1-HD-ReadWrite: (groupid=0, jobs=1): err= 0: pid=25640: Thu Aug 14
> 13:13:20 2014
> Description : [HD Seq read/write]
> read : io=30000KB, bw=1505.7KB/s, iops=1, runt= 19925msec
> clat (msec): min=4, max=9, avg= 7.80, stdev= 1.24
> lat (msec): min=4, max=9, avg= 7.80, stdev= 1.24
> <snip>
> bw (KB /s): min= 1495, max= 2991, per=100.00%, avg=1871.37,
> stdev=664.94
> write: io=30000KB, bw=1505.7KB/s, iops=1, runt= 19925msec
> clat (usec): min=553, max=2030, avg=1498.71, stdev=449.27
> lat (usec): min=658, max=2161, avg=1617.00, stdev=464.46
> clat percentiles (usec):
> <snip>
> bw (KB /s): min= 1488, max= 3024, per=100.00%, avg=1857.12,
> stdev=665.91
> lat (usec) : 750=4.88%, 1000=4.88%
> lat (msec) : 2=34.15%, 4=7.32%, 10=48.78%
> <snip>
> job1-HD-ReadWrite: (groupid=0, jobs=1): err= 0: pid=25640: Thu Aug 14
> 13:13:25 2014
> Description : [HD Seq read/write]
> read : io=39000KB, bw=1900B/s, iops=0, runt=21009984msec
> clat (msec): min=4, max=78, avg=10.49, stdev=13.99
> lat (msec): min=4, max=78, avg=10.49, stdev=13.99
> <snip>
> bw (KB /s): min= 1495, max= 2991, per=100.00%, avg=1853.76,
> stdev=649.04
> write: io=37500KB, bw=1827B/s, iops=0, runt=21009984msec
> clat (usec): min=553, max=2030, avg=1405.73, stdev=462.04
> lat (usec): min=610, max=2161, avg=1519.96, stdev=480.39
> <snip>
> bw (KB /s): min= 1488, max= 3024, per=100.00%, avg=1860.43,
> stdev=662.42
> lat (usec) : 750=5.77%, 1000=5.77%
> lat (msec) : 2=32.69%, 4=5.77%, 10=48.08%, 100=1.92%
> cpu : usr=0.02%, sys=0.34%, ctx=172, majf=0, minf=32
> IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%,
>> =64=0.0%
> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>> =64=0.0%
> complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>> =64=0.0%
> issued : total=r=26/w=26/d=0, short=r=0/w=0/d=0
> latency : target=0, window=0, percentile=100.00%, depth=1
>
> Run status group 0 (all jobs):
> READ: io=39000KB, aggrb=1KB/s, minb=1KB/s, maxb=1KB/s,
> mint=21009984msec, maxt=21009984msec
> WRITE: io=37500KB, aggrb=1KB/s, minb=1KB/s, maxb=1KB/s,
> mint=21009984msec, maxt=21009984msec
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