Re: 8 core CPU not fully active

[Tilman Hausherr <TH...@t-online.de>]

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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