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<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">I’ve been working in the gdal-dev-env (version 3.1.0, installed around mid-December)
on OSGeo4w (mostly because it’s faster than making COGs using the GTIFF driver) on large (e.g. 102600x91100) orthophoto rasters, generating VRTs, TIFFs and COGs.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">While I can do LZW, DEFLATE, and uncompressed just fine (2 minutes with all cores to
make a lzw COG from a VRT), I’m struggling to make JPEG COGs. If I run a loop, I can’t make it through more than one image without gdal_translate hanging at the finish for sometimes tens of hours. If I kill the process (CTRL-C doesn’t always work, but task
mgr does) then the resulting COG is fine (same size as if I wait n hours and the process finishes). Over the last few years I’ve had this issue (gdal_translate hanging at “100 – done.”) on many large rasters even when building as TIFF. Also maybe worth noting,
even on smaller rasters I often see GDAL hang for minutes to tens of minutes at the end of a raster build. In the past I was only been building single rasters though, so it’s not that big of a deal – I can just kill the process. Not any more. I frequently
build several at a time and hope to scale up.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">I’m running on a threadripper 3960x with 256GB RAM that I built. All processing is on
a NVMe drive. The LZW compressed tiffs (COGs) are around 1.5 - 3GB (8-bit,RGB with mask band). If I build with CPL_DEBUG=ON, depending on cachemax size, I see “potential thrashing on band one of .” at around 10-20% (even with GDAL_CACHEMAX at 80%), and if
not set high enough I’m stuck at 20% for hours and hours. Then gdal hangs at “100 – done.” for anywhere from 2 - 12+ hours unless I kill it. If I kill the process, the final raster builds out and appears to work fine, and is the same as if I wait X hours for
it to exit. For a test with debug on I just finished, after 2.5h hung at “done” I got this line:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">GDAL: GDALClose(<outfile.tif.ovr.tmp, this=000001FDC5531C50)<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">And another 45 minutes later the input and output tiffs closed and shared library unloaded
after the RAM slowly emptied from ~30 gig over that time.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">My overall command at the moment is:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">gdal_translate .\<infile.tif> <outfile.tif> -of COG -co COMPRESS=JPEG -co QUALITY=90
–config GDAL_CACHEMAX “80%” –config GDAL_SWATH_SIZE “80%” –config GDAL_FORCE_CACHING YES –config GDAL_MAX_DATASET_POOL_SIZE 2048<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white;vertical-align:baseline"><span style="font-size:11.5pt;color:#201F1E;border:none windowtext 1.0pt;padding:0in;background:white">And with lower values (and possibly if I get rid of the GDAL_FORCE_CACHING YES variable
– I just added that) I have the same “hang” at 100% lasting for even longer. Again, the same COG builds in 2 minutes with LZW, but with JPEG and all the cachemax settings ramped up, it takes maybe 6 hours.</span><span style="font-size:11.5pt;color:#201F1E"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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