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

Sun May 29 14:07:29 EDT 2011

Trevor,

I don't know exactly because my colleagues are trying out MG OS 2.2.
Basic information I have is that when they run concurrent tests with
grinder MG crashes ( only using gdal ).

I was not aware of this link before and that gdal version. I will
forward it to them and post our findings.

Thanks,
Haris

On Sun, May 29, 2011 at 6:04 PM, Trevor Wekel
<trevor_wekel at otxsystems.com> wrote:
> Hi Haris,
>
> What issues are you seeing with MG OS 2.2 and GDAL?  I have received good feedback on the provider in 2.2 with the VS2008 compiled GDAL libs http://trac.osgeo.org/mapguide/wiki/MGOS22GdalProvider
>
>
> Regards,
> Trevor
>
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Haris Kurtagic
> Sent: May 29, 2011 3:25 AM
> To: MapGuide Users Mail List
> Subject: Re: [mapguide-users] RE: Changing custom PoolSize for GDAL has no effect
>
> Hi Traian
>
> We are trying to use MG OS 2.2 with GDAL and it is not stable.
>
> Right now at customer sites we are using 2.1 with GDAL with patches we
> made some time ago. I remember we had lot of discussion around gdal/mg
> but can't remember whole story.
>
> I remember the issue was with concurrent access to gdal provider ( and
> also others ).
>
> If I am right at the end, there were some bigger changes made in MG
> connection manager to solve those issues ?
> In two patches you submitted, there are basically two things : added
> ref count to connection and creating copy of the schema ?
> The refcount change is related or not to changes made in MG connection manager?
>
> Thanks,
> Haris
>
> On Sat, May 28, 2011 at 6:32 PM, Traian Stanev
> <traian.stanev at autodesk.com> wrote:
>>
>>
>> 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>
>> 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] 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] On Behalf Of Gunter Becker
>> Sent: April 13, 2011 2:05 PM
>> To: 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
>>
>> --
>> View this message in context:
>> http://osgeo-org.1803224.n2.nabble.com/Changing-custom-PoolSize-for-GDAL-has-no-effect-tp6268276p6270448.html
>> Sent from the MapGuide Users mailing list archive at Nabble.com.
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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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>>
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