[gdal-dev] I get the following error when running gdalwarp with the -multi switch: ERROR 1: CPLCreateThread() failed in ChunkAndWarpMulti()

[Frank Warmerdam]

John Mitchell wrote:
> I get the following error when running gdalwarp with the -multi switch:
> 
> gdalwarp -multi -tr 1.2 1.2 -rc -s_srs EPSG:26917 -t_srs EPSG:26917
> -co bigtiff=yes  -q "17RMP395060.tif"
> "/tmp/gvAppTemp/gvApp2/m2.tiftemp"
> 
> ERROR 1: CPLCreateThread() failed in ChunkAndWarpMulti()
> ERROR 1: CPLCreateThread() failed in ChunkAndWarpMulti()
> 
> The -multi switch causes the error but if I take out the -multi switch
> then the command completes.
> 
> When I do the same command on an older linux server with the -multi
> switch then the command does not error off, so it could be that the
> newer server has a later version of gdal that does not like -multi.
> 
> The command will work without the -multi switch which I believe is
> supposed to run the gdalwarp command in multithreaded mode which in
> theory should be faster.
> 
> On a 64 bit version of gdal running on a 64 bit linux does performance
> improve at all if the -multi switch is included and if so how can I
> prevent this error from occurring when using the -multi switch.

John,

It likely means the GDAL was built without threading support.  If you
build yourself, consider using the --with-threads configure option.

Best regards,
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