On 02/10/2015 03:11 PM, Stefan Priebe wrote:

mhm i installed librbd1-dbg and librados2-dbg - but the output still
looks useless to me. Should i upload it somewhere?

Meh, if it's all just symbols it's probably not that helpful.

I've summarized your results here:

1 concurrent 4k write (libaio, direct=1, iodepth=1)

                IOPS            Latency
                wb on   wb off  wb on   wb off
dumpling        10870   536     ~100us  ~2ms
firefly         10350   525     ~100us  ~2ms

So in single op tests dumpling and firefly are far closer. Now let's see each of these cases with iodepth=32 (still 1 thread for now).

Mark


Stefan
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