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Low CPU usage during erosion in 15.11 dev 3

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Low CPU usage during erosion in 15.11 dev 3

Postby wdhwg001 » Tue Dec 29, 2015 3:45 am

CPU: Intel i7 5775C 3.3Ghz
Memory: 24GB
OS: Windows 10 x64 TH2

When Creating heightmap, the CPU usage is only about 20%, even when the L3DT.exe is in High priority.

Seems this issue also happens in the standard version 15.11.

I'm using L3DT to create large landscape(eg. 8192*8192), it takes a long time so I'm wondering if there is a fix.

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Re: Low CPU usage during erosion in 15.11 dev 3

Postby Aaron » Tue Dec 29, 2015 11:17 am

Hi wdhwg001,

I apologise for this inconvenience. The heightfield generation algorithms in L3DT are not multi-threaded, so during heightfield generation you should expect only one core to be at full utilisation. Hence, for these calculations the overall system CPU utilisation will be approximately 1/n, where n is the number of cores.

The calculations that have been multithreaded are those that are the most CPU intensive and take the most time; namely generating the attributes map, normal map, light map (shading, not shadow casting), and texture map. It is on my to-do list to re-write some of the heightifeld algorithms to be multi-threaded also, but I do not yet have a definite timeframe.

Best regards,
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