From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: RBD speed vs threads
Date: Fri, 15 Jun 2012 07:56:58 +0200 [thread overview]
Message-ID: <4FDACEAA.8080306@profihost.ag> (raw)
Hello list,
i still don't understand why the speed of the rados bench depends so
heavily on the threads.
Right now i get around 100MB/s per thread. So 1 thread is 100MB/s, 4
Threads 400MB/s and 16 threads results an about 1100MB/s.
So 1100MB/s is great but i still don't get why 1 thread gets "only" 100MB/s.
Total time run: 30.037374
Total writes made: 8326
Write size: 4194304
Bandwidth (MB/sec): 1108.752
Stddev Bandwidth: 47.5612
Max bandwidth (MB/sec): 1152
Min bandwidth (MB/sec): 948
Average Latency: 0.0577107
Stddev Latency: 0.020784
Max latency: 0.382413
Min latency: 0.026057
Stefan
next reply other threads:[~2012-06-15 5:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-15 5:56 Stefan Priebe - Profihost AG [this message]
2012-06-15 12:03 ` RBD speed vs threads Mark Nelson
2012-06-15 16:33 ` Sage Weil
2012-06-15 20:29 ` Stefan Priebe
2012-06-15 20:28 ` Stefan Priebe
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