[Qgis-developer] Memory leak in QGIS 2.14 with a Shapefile

[Nyall Dawson]

On 10 May 2016 at 03:38, kimaidou <kimaidou at gmail.com> wrote:
> Hi
>
> I just tested with a freshly built QGIS release-2_14 , and the issue
> remains.
> The easiest way to reproduce is to zoom back and forth from big scales ( ~
> 1:25 000 ) to layer extent scale ( ~ 1:600 000 )

Should be fixed by
https://github.com/qgis/QGIS/commit/6b80518a5b55ab30fb19493266d5626d0f89d26b

There was a leak in the OGR provider when a feature had null geometry
and a filter rect was set on a feature request (such as when rendering
a map).

I also fixed another (potentially huge?) memory leak in the python code.

Would appreciate testing and feedback on whether this has made a big
difference for you!

Nyall

>
> Good evening/morning
> Michaël
>
> 2016-05-09 15:02 GMT+02:00 kimaidou <kimaidou at gmail.com>:
>>
>> Hi Matthias,
>>
>> Not yet, I need to build QGIS master before being able to report back
>> Thanks for your answer
>>
>> 2016-05-09 14:59 GMT+02:00 Matthias Kuhn <matthias at opengis.ch>:
>>>
>>> Have you tested with either the latest 2.14 nightly or master nightly?
>>> An issue with OGR connection pooling has been resolved recently. And I
>>> wonder if that could be related.
>>>
>>>  -- Matthias
>>>
>>>
>>> On 05/09/2016 02:28 PM, kimaidou wrote:
>>>
>>> I created an issue about it : http://hub.qgis.org/issues/14792
>>>
>>> 2016-05-09 11:48 GMT+02:00 kimaidou <kimaidou at gmail.com>:
>>>>
>>>> Hi again,
>>>>
>>>> I also forgot to mention that I have no memory leak when using the same
>>>> dataset in PostGIS ( tested by importing the Shapefile in PostGIS with
>>>> shape2pgsql )
>>>>
>>>> Michaël
>>>>
>>>> 2016-05-09 11:07 GMT+02:00 kimaidou <kimaidou at gmail.com>:
>>>>>
>>>>> I forgot to mention the steps to reproduce the bug, and the precautions
>>>>> to take :
>>>>>
>>>>> * open the project in QGIS 2.14 ( I have not tested with older
>>>>> versions)
>>>>>
>>>>> * open a terminal and use this kind of command to monitor QGIS memory
>>>>> consumption : htop, or ps with
>>>>> watch -n1 'ps -aux --sort -pmem | head -5'
>>>>>
>>>>> * Navigate through the project by zooming in and out, pan, etc. I think
>>>>> you emphasize the memory leak by displaying the layer at small scale ( with
>>>>> many buildings displayed)
>>>>>
>>>>> * Be aware that this will increase the memory, so keep an eye on the
>>>>> memory consumption so that your system has enough free memory to work
>>>>> properly.
>>>>>
>>>>> Michaël
>>>>>
>>>>> 2016-05-09 11:00 GMT+02:00 kimaidou <kimaidou at gmail.com>:
>>>>>>
>>>>>> Hi devs,
>>>>>>
>>>>>> I have just found a memory leak in QGIS Desktop (and server) with the
>>>>>> project available in [1] ( a 20Mo tar.bz2 )
>>>>>>
>>>>>> This is a very simple project with only one buildings Shapefile ( SHP
>>>>>> 68Mo). This layer has been exported from PostGIS from a query wich aimed to
>>>>>> simplify the building for fast rendering.
>>>>>>
>>>>>> The geometries have been simplified ( I used SnapToGrid, then
>>>>>> (St_Dump(St_Union(a.geom)))  to remove as many nodes as possible )
>>>>>>
>>>>>> The layers has ~ 700 000 features.
>>>>>>
>>>>>> Has anyone encoutered such a leak ?
>>>>>>
>>>>>> [1]
>>>>>> https://framadrop.org/r/_7VsZtvzdU#+eJHHPPOIdVcgj/AUp8V91T9m6gmO7/XCh6uOhzP7ro=
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Michaël
>>>>>
>>>>>
>>>>
>>>
>>>
>>>
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>>>
>>> --
>>> Matthias Kuhn
>>> OPENGIS.ch - https://www.opengis.ch
>>> Spatial • (Q)GIS • PostGIS • Open Source
>>>
>>>
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>>
>
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