[Opensim-users] Slow handling of POST -

Wed Oct 24 03:03:24 UTC 2012

OSgrid services architecture has an nginx instance that is acting as a load balancer before requests are passed on to 
SRAS instances which implement the asset service.

The 504 gateway timeouts you are seeing are because SRAS instances are not responding with data before the nginx 60 
second timeout, unless you have another proxy between your simulator and osgrid.

Making enquiries today, I now know that osgrid has been doing an asset service migration since the start of October.  In 
the medium term this will result in a more responsive asset service.  However, right now it's possible that for periods 
the asset service is slow to respond.  This is due to continue for at least another couple of weeks.

Changes have now been made to cache data on nginx rather than always hit SRAS.  This may help.

I'm not sure whether this might be the underlying cause of your earlier problems or not.  Either way, while it exists 
it's hard to debug anything else.

This might also be the cause of recent white texture problems on osgrid.

Unfortunately, this is pegging the disk
On 23/10/12 09:28, Ai Austin wrote:
> Just to report a bit more on this from my testing in recent weeks.  I have used various OpenSim 0.7.5 dev master copies
> in between the last OSGrid packaged release 3 weeks ago and one released just a few hours ago.
>
> I tried the changes that Diva Canto made for proxy handling just prior to reverting the changes so people could test,
> and I did not observe any change in the slow post issues in the week I ran that version.
>
> I also installed a version after some changes by Melanie to increase the number of concurrent connections from the
> original 2... I was still seeing the slow post issues.
>
> More to the point, I just installed the r/20777 today from the OSGridfpackaged reelase of 0.7.5 dev master and on
> startup I still see a lot of VERY slow responses - can they really be taking 69 seconds? -   even before any avatar has
> logged into the region.
>
> Here is one extract from the startup log just now on first run of the OpernSim.exe instance of some regions with
> relatively little content as add-on region to OSGrid...
>
> 09:17:02 - [SynchronousRestObjectRequester]: WebException for GET http://assets.
> osgrid.org/assets/7c2ee836-dc42-4100-be85-ff983385d78b OpenSim.Framework.AssetBa
> se: The remote server returned an error: (504) Gateway Timeout.    at System.Net
> .HttpWebRequest.GetResponse()
>     at OpenSim.Framework.SynchronousRestObjectRequester.MakeRequest[TRequest,TRes
> ponse](String verb, String requestUrl, TRequest obj, Int32 pTimeout, Int32 maxCo
> nnections) in d:\OSGRID\OSGRID 0.7 RELEASES\osgrid.opensim-10232012.v0.7.5-36bfd
> 3667c44f7cd4e66e880c45c34903ed34842\OpenSim\Framework\WebUtil.cs:line 1126
>
> 09:17:02 - [SynchronousRestObjectRequester]: Slow request 113 GET http://assets.
> osgrid.org/assets/7c2ee836-dc42-4100-be85-ff983385d78b took 60139ms, 0ms writing,
>
> [WARNING]: EOC marker not found. Codestream is corrupted.
>
> 09:18:49 - [SynchronousRestObjectRequester]: WebException for GET http://assets.
> osgrid.org/assets/783f8b90-c2e9-4555-a16f-8a57185c3069 OpenSim.Framework.AssetBa
> se: The remote server returned an error: (504) Gateway Timeout.    at System.Net
> .HttpWebRequest.GetResponse()
>     at OpenSim.Framework.SynchronousRestObjectRequester.MakeRequest[TRequest,TRes
> ponse](String verb, String requestUrl, TRequest obj, Int32 pTimeout, Int32 maxCo
> nnections) in d:\OSGRID\OSGRID 0.7 RELEASES\osgrid.opensim-10232012.v0.7.5-36bfd
> 3667c44f7cd4e66e880c45c34903ed34842\OpenSim\Framework\WebUtil.cs:line 1126
>
> 09:18:49 - [SynchronousRestObjectRequester]: Slow request 175 GET http://assets.
> osgrid.org/assets/783f8b90-c2e9-4555-a16f-8a57185c3069 took 63133ms, 0ms writing,
>
> 09:20:09 - [SynchronousRestObjectRequester]: WebException for GET http://assets.
> osgrid.org/assets/dd2854dd-314b-4118-a8b7-2c33794e6c9f OpenSim.Framework.AssetBa
> se: The remote server returned an error: (504) Gateway Timeout.    at System.Net
> .HttpWebRequest.GetResponse()
>     at OpenSim.Framework.SynchronousRestObjectRequester.MakeRequest[TRequest,TRes
> ponse](String verb, String requestUrl, TRequest obj, Int32 pTimeout, Int32 maxCo
> nnections) in d:\OSGRID\OSGRID 0.7 RELEASES\osgrid.opensim-10232012.v0.7.5-36bfd
> 3667c44f7cd4e66e880c45c34903ed34842\OpenSim\Framework\WebUtil.cs:line 1126
>
> 09:20:09 - [SynchronousRestObjectRequester]: Slow request 185 GET http://assets.
> osgrid.org/assets/dd2854dd-314b-4118-a8b7-2c33794e6c9f took 69451ms, 0ms writing,
>
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-- 
Justin Clark-Casey (justincc)
OSVW Consulting
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