Christian,
I suspect the issue is not that much jumping from 4 to 5 threads, but
some latent issue in your code or in GDAL/PROJ that becomes more
visible. First thing to check: are you sure you are not using a given
GDAL / OGR object simultaneously in more than one thread ?
If that's not the issue, if you want effective help, I'm afraid you'll
have to go through the effort of writing a minimal standalone reproducer
(code+data) that you can share with us.
Even
Le 11/10/2022 à 14:56, Christian Brock via gdal-dev a écrit :
I have some special issue and would be glad for suggestions.
We run complex regression tests using environmental files -- too complex for a
bug report ;-(
Moving from GDAL_2.4.2/PROJ_5.2.0 to GDAL 3.5.2/PROJ_9.1.0 we run into
regressions.
The most stunning observation is that the issue only occurs when USING MORE
THAN FOUR THREADS!
Can anyone think of something that is true with five or more threads but not
below?
Besides this I should mention, that we use Java bindings
The issue is
- file format independent,
- were observed on ubuntu 20.04 and 22.04,
- affects a sample with the following coordinate system:
PROJCS["Transverse
Mercator",GEOGCS["Potsdam_IST_V2_0",DATUM["Potsdam_IST_V2_0",SPHEROID["Bessel",6377397.155,299.152813106079],TOWGS84[583,68,399.5,0,0,1.36E-05,1.13E-05]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",9],PARAMETER["scale_factor",1],PARAMETER["false_easting",3500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH]]"
- WGS84 and all UTM systems are good.
I should also mention, that this issue affects only the second sample, when I
run more than one sample with the PROJCS above.
When I change the sample order, it is the second sample again!
And as a final point, there are random memory corruptions every couple of hours.
So again, please step forward when you know of anything inside GDAL, PROJ or
Java bindings that cares about the number of threads.
Many thanks
--Chr.
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