Prime95 29.5b6

porina · January 4, 2019

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29.5 build 6.

1) Fixed testing tiny numbers with AVX-512 FFTs, numbers less than about 5120 bits are forced to use FMA FFTs.
2) Torture test dialog box allows picking AVX-512, AVX2, AVX, SSE2 FFTs.
3) Changed FFT crossovers. ATH, let me know if this is better.
4) Eliminated soft crossovers. Instead, I hope to get the crossovers right in the gwnum code. Soft crossovers can be re-enabled (see undoc.txt).
5) Eliminated a memory leak when a benchmark is interrupted.
6) In linux a pid file is created (mprime.pid).
7) New swizzle code is used. FFTs should be about 0% faster. Well, maybe small FFTs that run in the L2 cache will see a tiny speed bump.

Not fixed:
1) The hangs reported in benchmarking. Please try again with this release. I cannot get it to happen in Linux. Is this a Windows-only issue? Does this only happen benchmarking multi-threaded FFTs? Is CPU usage 0% at the time of the hang? Hangs are usually due to a deadlock. Benchmarks use locks to sync the start of all the worker threads. Multi-threaded FFTs also use locks to coordinate threads.

Source with download: https://mersenneforum.org/showpost.php?p=504823&postcount=103

This is the latest test version in 29.5 series, which added AVX-512 support. I hadn't been following that closely, but do note the stress test dialog box now includes options to disable certain instructions. This could be useful if you want to dial in different offsets on Intel CPUs, although of course this is only one stress and you should use a variety to make sure nothing is missed.

porina · January 12, 2019

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The new torture test feature to run a weaker test had a bug. It was selecting exponents that were too big for the FFT size. A new Windows executable for you to test:

https://www.dropbox.com/s/sc4ib5v4f4...ime95.zip?dl=0

Source: https://mersenneforum.org/showpost.php?p=505665&postcount=152

Update in case anyone is trying this test version. Did I say it was a test version?