runtime and status-interval

[John OCallaghan <john.ocallaghan@s3group.com>]

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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