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<font size="-1"><font face="Helvetica, Arial, sans-serif">Hi All,<br>
<br>
Right now I tried everything, but PUT speed remains very slow.
In order to speedup I tried various combination of workers,
disabled disk mount check, enabled DEBUG log level, checked
source code to understand logic, finally added another node. No
errors, and I was able only to squeeze out 5 PUTs/sec.<br>
<br>
I described full setup here:
<a class="moz-txt-link-freetext" href="http://paste.openstack.org/show/3885/">http://paste.openstack.org/show/3885/</a><br>
<br>
The only thing which looks suspicious to me are these errors:<br>
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<pre>Dec 18 04:01:28 ec01 object-server ERROR container update failed with 10.0.1.3:6001/d01 (saving for async update later): Timeout (3s) (txn: txdf95ad5a10844ee0b74d70d8a7638082)
Dec 18 04:01:28 ec01 object-server ERROR container update failed with 10.0.1.2:6001/d01 (saving for async update later): Timeout (3s) (txn: txee2545ba4610430fa3a6a166ca50c574)
Dec 18 04:01:28 ec01 object-server ERROR container update failed with 10.0.1.8:6001/d01 (saving for async update later): Timeout (3s) (txn: tx2546b29b15c643ec90a122a753dfddd3)
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I don't really know where else to dig. Any help appreciated.<br>
<br>
<br>
Many thanks,<br>
Rustam.<br>
<br>
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On 17/12/2011 06:14, Ywang225 wrote:
<blockquote cite="mid:450B97E1-4B5B-4F9A-8173-80AD157DE1C0@126.com"
type="cite">
<pre wrap="">increasing concurrency （with -c）should boost write performance.
发自我的 iPhone
在 2011-12-16，11:20，Rustam Aliyev <a class="moz-txt-link-rfc2396E" href="mailto:rustam@code.az"><rustam@code.az></a> 写道：
</pre>
<blockquote type="cite">
<pre wrap="">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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