Am 15.07.2017 um 13:06 schrieb Tilman Hausherr:
When TestPDFToImage.java runs on my 1000 PDF test set on my old 4 core
CPU on W7, the CPU is fully used. When I do the same on my new 8 core
CPU (16 threads) on W10, max CPU usage is about 75%.
I did several tests with adding threads or reducing threads. Although
adding threads resulted in better CPU usage, the fastest overall
result on all files was with 14 threads.
Fixed by PDFBOX-3897. I haven't tested this time what amount of threads
is best, but the CPU usage is now 100% most of the time during the test.
My guess is that there's some synchronization, somebody mentioned this
in PDFBOX-3854 but related to another operation in java graphics.
Tilman
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