Do you have any control over the decode thread pool size? If so, you might try twisting that knob and see if it makes a difference. I suppose you could be seeing differences due to the exr concurrency model.
(Is it disconcering to be spending nearly a half-hour opening files?) Karl On Friday, September 16, 2016, Søren Ragsdale <sor...@gmail.com> wrote: > Hello, OpenEXR devs. I've been doing some comparative rendering tests I've > found something a bit surprising. > > TIFF and EXR texture access *times* seems more or less the same, which is > fine because the underlying data is equivalent. (Same data type, > compression, tile size, etc.) But the RAM overhead seems much higher for > EXRs. We've got a 9GB render using TIFFs and a 13GB render using EXRs. > > Does anyone have some theories why EXR texture access is requiring 4GB > more memory? > > > Prman-20.11, OSL shaders, OIIO/TIFF textures: > real 00:21:46 > VmRSS 9,063.45 MB > OpenImageIO ImageCache statistics (shared) ver 1.7.3dev > Options: max_memory_MB=4000.0 max_open_files=100 autotile=64 > autoscanline=0 automip=1 forcefloat=0 accept_untiled=1 > accept_unmipped=1 read_before_insert=0 deduplicate=1 > unassociatedalpha=0 failure_retries=0 > Images : 1957 unique > ImageInputs : 136432 created, 100 current, 796 peak > Total size of all images referenced : 166.0 GB > Read from disk : 55.5 GB > File I/O time : 7h 2m 33.9s (16m 54.2s average per thread) > File open time only : 27m 44.0s > > > Prman-20.11, OSL shaders, OIIO/EXR textures: > real 00:21:14 > VmRSS 12,938.83 MB > OpenImageIO ImageCache statistics (shared) ver 1.7.3dev > Options: max_memory_MB=4000.0 max_open_files=100 autotile=64 > autoscanline=0 automip=1 forcefloat=0 accept_untiled=1 > accept_unmipped=1 read_before_insert=0 deduplicate=1 > unassociatedalpha=0 failure_retries=0 > Images : 1957 unique > ImageInputs : 133168 created, 100 current, 771 peak > Total size of all images referenced : 166.0 GB > Read from disk : 55.5 GB > File I/O time : 6h 15m 42.1s (15m 1.7s average per thread) > File open time only : 1m 22.5s > >
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