22 lines
896 B
Text
22 lines
896 B
Text
Weird Performance
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1. If you see serious performance loss (extremely low performance),
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probably you created too many threads or process. Basically GotoBLAS
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assumes that available cores that you specify are exclusively for
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BLAS computation. Even one small thread/process conflicts with BLAS
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threads, performance will become worse.
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The best solution is to reduce your number of threads or insert
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some synchronization mechanism and suspend your threads until BLAS
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operation is finished.
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2. Simlar problem may happen under virtual machine. If supervisor
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allocates different cores for each scheduling, BLAS performnace
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will be bad. This is because BLAS also utilizes all cache,
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unexpected re-schedule for different core may result of heavy
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performance loss.
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Anyway, if you see any weird performance loss, it means your code or
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algorithm is not optimal.
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