[gdal-dev] MBTiles creation problems on some iOS devices

[gunnarblom]

Some additional info. What is weird is that I now tried it on the most low
end device, iPhone 4S with 512mb ram and that by default uses 25mb cache.

It works pretty well, with some disk writing, but seems on healthy levels.
The difference in patterns I see is that on iPad 3 it is writing "Flushed 0
tiles" and "Flushed 1 tiles" a lot, which seems pretty unhealthy? In either
case, that seems to be the big difference that is causing it to stall the
whole process.

Any ideas?

iPhone 4S log (25mb cache):

Input file size is 5000, 5000
GDAL: GDAL_CACHEMAX = 25 MB
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=0,0,2395x1172 Dst=0,0,3328x1536
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=2340,0,1290x2435 Dst=3328,0,1536x3328
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=3503,0,1497x1016 Dst=4864,0,1960x1536
GPKG: Partial tiles DB is 28405760 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 129
GPKG: Flushed 43 tiles. Target was 64
GPKG: Partial tiles DB is 39493632 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 123
GPKG: Flushed 44 tiles. Target was 61
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=0,1067,2457x1470 Dst=0,1536,3328x1792
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=3560,935,1440x1445 Dst=4864,1536,1960x1792
GPKG: Partial tiles DB is 32014336 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 144
GPKG: Flushed 43 tiles. Target was 72
GPKG: Partial tiles DB is 30134272 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 181
GPKG: Flushed 32 tiles. Target was 90
GPKG: Partial tiles DB is 34451456 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 165
GPKG: Flushed 16 tiles. Target was 82
GPKG: Partial tiles DB is 35696640 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 145
GPKG: Flushed 29 tiles. Target was 72
GDAL: Potential thrashing on band 1 of
/var/containers/Bundle/Application/3477D684-F817-4DA9-853A-98B988AF419B/fjallkartan.app/fjallkarta/vf73_6_50.tif.
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=0,2432,2509x1280 Dst=0,3328,3328x1536
GPKG: Partial tiles DB is 29904896 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 90
GPKG: Flushed 35 tiles. Target was 45
GPKG: Partial tiles DB is 35098624 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 106
GPKG: Flushed 53 tiles
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=2454,2299,2546x1310 Dst=3328,3328,3496x1536
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=0,3664,1194x1336 Dst=0,4864,1536x1967
GPKG: Partial tiles DB is 34304000 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 92
GPKG: Flushed 46 tiles
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=1131,3606,1446x1394 Dst=1536,4864,1792x1967
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=2506,3551,1256x1449 Dst=3328,4864,1536x1967
GPKG: Partial tiles DB is 30826496 bytes. Flushing part of partial tiles
GPKG: Active partial tiles before flush: 118
GPKG: Flushed 57 tiles. Target was 59
GDAL: GDALWarpKernel()::GWKGeneralCase()
Src=3685,3473,1315x1527 Dst=4864,4864,1960x1967



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