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Author Topic: Strange Performance result  (Read 1169 times)

WitheHole18

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Strange Performance result
« on: February 11, 2015, 10:52:55 AM »
Hello I'm back and I can say that 13 alpha has brought great improvements and a system of collisions very good, however I did a performance test and here are the parts of my computer:
GPU:GTX 970 palit reference card
CPU:i7 4790k intel 1150 socket
PSU:1000watt
HDD:4 TB
SDD:500 GB
MOB:asus z97 K
The result is 37
the result if perfomance test for the parts of pc,but is low because the optimiziazion of simulator or my pc have an incompatible parts?(I 've mounted the computer  :) )
Here the log

C7

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Re: Strange Performance result
« Reply #1 on: February 11, 2015, 11:11:24 AM »
Taking a look at your logs, it seems like your performance issues are due to not having your CPU available as an OpenCL device. You can use either the Intel OpenCL drivers, or the generic ones from AMD. Either should work fine.

https://software.intel.com/en-us/articles/opencl-drivers

(Use 2.9.1, stable)
http://developer.amd.com/tools-and-sdks/opencl-zone/amd-accelerated-parallel-processing-app-sdk/

Technical reasons: As counter intuitive as it may seem, newer GPUs actually have progressively worse performance at double precision. Things have shifted to focus on performance of floating point, since that's currently what's used for rendering. They instead produce cards with high Double precision performance, that are used for professional applications.

The problem, is that US² is pretty much exclusively in double precision. Modern CPUs have no issue with doubles and will often perform better then a fast, modern GPU.

Here's a concrete example, this is the processing power in both modes on a GTX 970. In (Giga Operations Per Second)
Single (float) 3494
Double 109

Or in short, almost 1/34th the performance.