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jratike80 avatar jratike80 commented on August 26, 2024

Of course there should be no errors of crashes, but I wonder how much sense there is in creating overviews in multiple threads. GeoPackage is an SQLite database and only one process at a time can write. But maybe it is slower to create the overviews than to save them into the database. Fortunately that should be rather easy to test.

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rouault avatar rouault commented on August 26, 2024

but I wonder how much sense there is in creating overviews in multiple threads.

Multithreading in overview generation only affects the computation part (well for the GeoTIFF driver, this can also cause multi-threaded writes within the driver). This can help a bit depending on the resampling kernel. The issue here was that one of those computation worker threads accidentally queried the NBITS metadata item on the overview band, which on the first call can cause a SQLite request, wheras the I/O thread could potentially read or write GeoPackage blobs at the same time, hence a concurrent use of the same SQLite handle. Fixed per #10246

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