Ceph

Description of Feature:

rados bench : add cleanup message with time it has taken to delete the objects when cleanup start for written objects

# rados -p rbd  bench 20  write -b 8192 -t 256
 Maintaining 256 concurrent writes of 8192 bytes for up to 20 seconds or 0 objects
 Object prefix: benchmark_data_dell-per630-8.gsslab.pnq2.red_59618
   sec Cur ops   started  finished  avg MB/s  cur MB/s  last lat   avg lat
     0       0         0         0         0         0         -         0
     1     255     11275     11020   85.9967   86.0938 0.0209201  0.022394
     2     255     21299     21044   82.1255   78.3125 0.0160036 0.0240254
     3     256     33494     33238   86.5002   95.2656 0.0176813 0.0229041
     4     255     44851     44596   87.0498   88.7344 0.0204237 0.0228027

 ................................
 .................................

2016-05-03 16:45:28.715926min lat: 0.00156224 max lat: 7.1998 avg lat: 0.0559234
   sec Cur ops   started  finished  avg MB/s  cur MB/s  last lat   avg lat
    20     254     85867     85613   33.4264   6.195310.00497779 0.0559234
    21     254     85867     85613   31.8353         0         - 0.0559234
    22     254     85867     85613   30.3887         0         - 0.0559234
 Total time run:         22.334877
Total writes made:      85867
Write size:             8192
Bandwidth (MB/sec):     30.035 

Stddev Bandwidth:       34.5402
Max bandwidth (MB/sec): 95.2656
Min bandwidth (MB/sec): 0
Average Latency:        0.0664779
Stddev Latency:         0.456263
Max latency:            7.1998
Min latency:            0.00156224

- After benchmark is completed, there is a long pause as it start deleting the written objects (clean up).

- Adding cleanup message with time it has taken to delete the objects when cleanup start for written objects will help.

Version-Release number of selected component (if applicable):
Red Hat Ceph Storage 1.3.2
ceph-0.94.5-9.el7cp