cpu stress test math and prime95 number failed

Cpu stress test math and prime95 number failed update#
Cpu stress test math and prime95 number failed code#
Cpu stress test math and prime95 number failed windows#

To answer your question and your inferences, yes, Mersenne testing uses arbitrary precision arithmatic implemented as a special form of FFT. I wrote more over at TR, check the link above for that.

Cpu stress test math and prime95 number failed code#

Although, did it fail the check, or did the checking code itself throw an exception or something? Reply Depending on the algorithm, there are other checks that can be done. With very long running code that supports check points, they sometimes run the same code twice, on different processors to insure the accuracy of the results.

It would be better if it did crash instead of producing incorrect results. Hopefully encryption code isn’t effected I would think that would have been noticed already if that was the case. It could be a small number of people that are effected, as this is probably even more specialized than the FDIV bug. I don’t know the mersenne prime algorithm, but I would guess it involves arbitrary precision arithmetic. Perhaps it comes out in a unique instruction sequence. I wouldn’t expect a single instruction error to have made it through testing. It doesn’t sound like they have narrowed it down to a specific instruction or sequence of instructions yet.

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Here is some more Tech News from around the web: It was turned up by prime number experts the Great Internet Mersenne Prime Search (GIMPS), who use Intel machines to identify and test new large prime numbers.' 'The good news is that the bug's triggered by complex workloads. You can follow the detection and investigation of the bug and what is being done over at The Register.

Cpu stress test math and prime95 number failed update#

While having a freeze is certainly better than getting an incorrect result, it is still inconvenient and we hope that Intel's BIOS update will arrive soon.

Cpu stress test math and prime95 number failed windows#

The issue has been replicated on both Windows and Linux systems and on different motherboards, signifying that the issue does indeed come from the CPU. Now there is a new bug to remember, found on Skylake processors, which can cause the processor to freeze during complex calculations such as you would do in Prime95 or if you contribute to the Great Internet Mersenne Prime Search project. You may remember the infamous Pentium FDIV bug, which could cause the wrong decimal results to be given in an answer to complex mathematical calculations which caused much consternation among scientists in the early 90's.