[mapguide-users] RE: Changing custom PoolSize for GDAL has no effect

[Traian Stanev]

Hi Zack,

The MapGuide PSC was against this patch back then. It is up to them to decide if they want it now. It’s been too long and I no longer have a MapGuide environment set up to test it with the latest code, so it would be up to someone who needs this to check it in and test it, or I can merge it in without testing.

Traian


From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Zac Spitzer
Sent: Saturday, May 28, 2011 2:38 AM
To: MapGuide Users Mail List
Subject: Re: [mapguide-users] RE: Changing custom PoolSize for GDAL has no effect

That patch sounds pretty important, can we commit it?
On Sun, Apr 17, 2011 at 3:18 AM, Traian Stanev <traian.stanev at autodesk.com<mailto:traian.stanev at autodesk.com>> wrote:

Not sure if that would help, but a patch I did a while back to fix refcounting issues with the GDAL provider also included an optimization about config file parsing which sped up opening of new GDAL connections by a factor of 10 at least.

The patch is attached to this ticket: http://trac.osgeo.org/mapguide/ticket/462 called gdal_nomutex_cachedschema.patch.

It was a long time ago, but as far as I remember this optimization was key in case one wants to enable pooling of GDAL connections. It also removed the internal global mutex in the provider which made it work single-threaded regardless of the setting in the MapGuide configuration. That patch requires my addref patch attached to the same ticket.

Traian


-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org<mailto:mapguide-users-bounces at lists.osgeo.org> [mailto:mapguide-users-bounces at lists.osgeo.org<mailto:mapguide-users-bounces at lists.osgeo.org>] On Behalf Of Trevor Wekel
Sent: Friday, April 15, 2011 12:26 AM
To: MapGuide Users Mail List
Subject: RE: [mapguide-users] RE: Changing custom PoolSize for GDAL has no effect

Hi Gunter,

Since only one raster feature source can be loaded at any given time, you may up with some additional load overhead if your config.xml (raster catalog) documents are fairly large.  As far as I know, the config.xml information will only remain cached for the lifetime of the connection to the raster feature source.  With 35 raster feature sources, it may be getting parsed for every raster request.

Regards,
Trevor


-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org<mailto:mapguide-users-bounces at lists.osgeo.org> [mailto:mapguide-users-bounces at lists.osgeo.org<mailto:mapguide-users-bounces at lists.osgeo.org>] On Behalf Of Gunter Becker
Sent: April 13, 2011 2:05 PM
To: mapguide-users at lists.osgeo.org<mailto:mapguide-users at lists.osgeo.org>
Subject: [mapguide-users] RE: Changing custom PoolSize for GDAL has no effect

Thanks Trevor,

can I suppose that my configuration (35 raster featuresources, 50 concurrent
user) could work with
the single-threaded GDAL Provider or does the provider means a bottleneck
for my application?

The repository error: I will try final release as soon it is available and
if the error exists I will post it here. I supposed it has to do something
with the rasterprovider since I've not found any hint in logfiles on what's
going on. Even with full error report enabled.

Funding the work on the GDAL Provider: I have to discuss this with my
company (personally I'd like to fund but it is not my decision)

Thanks, Gunter

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--
Zac Spitzer
Solution Architect / Director
Ennoble Consultancy Australia
http://www.ennoble.com.au
http://zacster.blogspot.com
+61 405 847 168


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