[mapguide-internals] MapGuide RFC 65 - ACE 5.6 upgrade is ready for review

[Traian Stanev]

It is possible to run without the lock (and also without a similar lock that exists on the other side of the GDAL provider), provided that a fix is made to the GDAL provider refcounting. This was held back for the 2.1 release due to concerns by Haris and Jason (and others) about removing the lock being risky. There was a long thread about this a month or so ago.

Traian


________________________________________
From: mapguide-internals-bounces at lists.osgeo.org [mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Trevor Wekel
Sent: Thursday, June 04, 2009 4:49 PM
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] MapGuide RFC 65 - ACE 5.6 upgrade is ready    for     review

Good catch Jason.  The ACE_GUARD will make all raster processing single threaded.  I believe Gdal and WMS would fall into this category.  Serverconfig.ini settings can also affect the number of concurrent connections.

Thanks,
Trevor

-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org [mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Jason Birch
Sent: Thursday, June 04, 2009 2:45 PM
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] MapGuide RFC 65 - ACE 5.6 upgrade is ready for review

Looks like one of the locks is still there:

http://trac.osgeo.org/mapguide/browser/branches/2.1/MgDev/Server/src/Services/Mapping/MappingUtil.cpp#L675

Was there something else in there limiting the raster provider to a single connection?

Jason

-----Original Message-----
From: Trevor Wekel
Sent: Thursday, June 04, 2009 1:35 PM
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] MapGuide RFC 65 - ACE 5.6 upgrade is ready for review

Big giant locks would certainly affect multi-core scalability.  I know Bruce did a whole ton of work on the Fdo connection management in MapGuide to improve Gdal threading issues.  I don't know if the big giant lock went it.

-----Original Message-----
From: Traian Stanev
Sent: Thursday, June 04, 2009 2:15 PM
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] MapGuide RFC 65 - ACE 5.6 upgrade is ready for review

While this is true, don't we also have the big giant lock in the code, which makes sure that if you have rasters for example (where I/O matters), you will only be working on one request at a time anyway?
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