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

[John Mitchell]

Also the older linux server is 32 bit linux with gdal 1.4.4.1 and the
new server that errors on -multi has 64 bit linux with gdal 1.4.4.2.

In checking some old emails someone said that they also could not use
-multi either but said
"If I raise the values for GDAL_CACHEMAX and -wm it doubled the speed".

John


On 8/25/10, John Mitchell <mitchelljj98 at gmail.com> 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.
>
> Thanks,
>
> John
>


-- 
John J. Mitchell