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increasing concurrency （with -c）should boost write performance.

发自我的 iPhone

在 2011-12-16，11:20，Rustam Aliyev <rustam at code.az> 写道：

> Hi,
> 
> I'm testing swift 1.4.4 setup with 4 nodes/zones on RHEL 5.7. I ran into the problem of slow writes. Using swift-bench we generated load, writing hundreds of 4K files. Results:
> - Writes - ~3 PUTs/sec (very slow)
> - Reads - ~25 GETs/sec (ok)
> 
> It's clear that writes are not limited by I/O. To prove that, I increased file size to 8K, 32K and 64K. In all cases, even with 64K, I had same result - 3 PUTs/sec.
> 
> In the logs of the object servers I can see that each PUT operation actually took around 0.3 sec which is inline with 3 PUTs/ sec reported by swift-bench.
> 
> Is that expected performance for such small cluster? Can I break down those 0.3 seconds spent for PUT operation to see where's bottleneck?
> 
> Any advice for troubleshooting this is welcome.
> 
> Regards,
> Rustam.
> 
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