[Opensim-dev] OpenSim.exe console - progress messages with mesh uploads

[Mike Chase]

On 08/30/2013 08:58 AM, Robert Martin wrote:
> one thing that might help things here is have some way of having the 
> simulator "bounce"/return zero when it is doing the calculate cost 
> stage of a mesh upload.

That's not  really going to help I don't think.  I don't believe the 
OpenSim implementation does anything or even looks for the mesh data 
when the cost stage is executed.

Mesh upload happens in 2 stages.  When you push the calculate button the 
client crunches data and sends a snapshot of it along with the 
NewAgentInventory request to the server.    The server returns the 
upload cap along with any optional cost calculations it has done. The 
client then re-contacts the server at the new cap and transmits the data 
(again) for the actual upload.

There are two likely places for bottlenecks and depending on what core 
opensim does an additional place where a failure is possible.

1) The initial calculations done by the client.  If this is the case its 
going to be seen prior to the upload button enabling.
2) The actual data transmission.  Probably not a problem because it's 
using HTTP for the transfer in both cases.  Also if you are seeing the 
upload button enable then that transmission has already happened once. 
Which would indicate its probably not the issue.

There is an additional scenarios I hit when I did the implementation for 
InWorldz.   The zlib.net decompression code occasionally throws 
indicating an invalid code stream.  IDK if the upstream code actually 
cracks open the mesh in any way but if so its entirely possible thats 
what is failing and the exception is being eaten. In the InWorldz case I 
replaced the zlib calls with the compression/decompression code in .NET 
and resolved the issue that way.  Its something additional to check.

So more than likely from the description the issue is with asset 
creation or something that's done after the transmission takes place.

Hope this helps a bit.

Mike
>
>
> On Thu, Aug 29, 2013 at 6:48 PM, Justin Clark-Casey 
> <jjustincc at googlemail.com <mailto:jjustincc at googlemail.com>> wrote:
>
>     I'm not sure this will be possible as I believe mesh is uploaded
>     via a single HTTP post, which isn't easy to monitor server-side.
>      It's also possible that the mesh you're trying to upload is
>     unfortunately simply too large and that we should have (optional)
>     server-side enforced limits.  But this is speculation on my part.
>
>     Is this a purely local upload or one to a server not on the same
>     system?  If the server is on a different system, possibly you
>     could install a monitoring tool to check your rate of data upload.
>      Naturally, one would expect a server on a local LAN to be very
>     quick, but a remote one might be different and even on the local
>     scenario, things like slow wifi might come into play.
>
>     Perhaps you could install a monitoring tool on your system
>
>     On 24/08/13 17:22, Ai Austin wrote:
>
>         I wonder if its possible to get any debugging related to mesh
>         uploads and their progress (or otherwise).
>
>         I think I am timing out even when I set the AckTimeout = 600  
>         as suggested by Justin and want to try to figure out
>         the stage at which the problems occur.
>
>         I am uploading some Collada meshes that are 20MB up to 100MB
>         in size.. and got them in once.. but cannot reliably repeat
>         that especially f I try to vary the upload options to scale
>         the incoming mesh, or if I add any physics details.
>
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>
>
>     -- 
>     Justin Clark-Casey (justincc)
>     OSVW Consulting
>     http://justincc.org
>     http://twitter.com/justincc
>
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>
>
> -- 
> Robert L Martin
>
>
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