Hi All,
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.
I described full setup here: http://paste.openstack.org/show/3885/
The only thing which looks suspicious to me are these errors:
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)
I don't really know where else to dig. Any help appreciated.
Many thanks,
Rustam.
On 17/12/2011 06:14, Ywang225 wrote:
increasing concurrency （with -c）should boost write performance.
发自我的 iPhone
在 2011-12-16，11:20，Rustam Aliyev<[email protected]> 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.
_______________________________________________
Mailing list: https://launchpad.net/~openstack
Post to : [email protected]
Unsubscribe : https://launchpad.net/~openstack
More help : https://help.launchpad.net/ListHelp
_______________________________________________
Mailing list: https://launchpad.net/~openstack
Post to : [email protected]
Unsubscribe : https://launchpad.net/~openstack
More help : https://help.launchpad.net/ListHelp
