Bryan -
Note that the default block size for the rados bench is 4MB...and
performance decreases quite dramatically with smaller block sizes (-b
option to rados bench).
On 27/09/12 08:54, Bryan K. Wright wrote:
The rados benchmark was run on one of the OSD
machines. Read and write results looked like this (the
objects size was just the default, which seems to be 4kB):
# rados bench -p pbench 900 write
Total time run: 900.549729
Total writes made: 33819
Write size: 4194304
Bandwidth (MB/sec): 150.215
Stddev Bandwidth: 16.2592
Max bandwidth (MB/sec): 212
Min bandwidth (MB/sec): 84
Average Latency: 0.426028
Stddev Latency: 0.24688
Max latency: 1.59936
Min latency: 0.06794
# rados bench -p pbench 900 seq
Total time run: 900.572788
Total reads made: 33676
Read size: 4194304
Bandwidth (MB/sec): 149.576
Average Latency: 0.427844
Max latency: 1.48576
Min latency: 0.015371
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