Maximum core count support in latest Prime95

avinashkv94 · 2021-09-09, 10:33

Is the maximum core count support for Prime95 24 ? If yes then how do we run it with CPUs like threadripper that has more than 24 cores?

axn · 2021-09-09, 10:38

From whatsnew.txt

Quote:

New features in Version 28.5 of mprime
--------------------------------------

7) Maximum number of threads supported rasied from 64 to 512.

Even before this change, it was supporting 64 threads. So I guess it can handle TR.

paulunderwood · 2021-09-09, 11:31

Quote:

Originally Posted by avinashkv94

Is the maximum core count support for Prime95 24 ? If yes then how do we run it with CPUs like threadripper that has more than 24 cores?

The 64 core TR comprises of 8 chiplets and so it is best to run 8 workers at the current wavefront of GIMPS. Forget using Hyper Threading -- only real cores count.

kriesel · 2021-09-09, 15:26

Welcome to the forum. It's understandable you'd not be familiar with the following since you're new here.

Just out of curiosity, where did the idea of 24 cores as a maximum for prime95 / mprime come from?
Drkirkby has posted in various locations about running mprime on a dual-26-core system. Madpoo on dual-14 earlier.

Some of us have run mprime or prime95 on KNL Xeon Phi with 64 or 68 actual cores, and tested what level of HT might be beneficial versus fft length. And posted benchmark results.

There are whole threads about Xeon Phi. And posts in draft in the reference info.

2021-09-09, 10:33	#1
avinashkv94 Sep 2021 1 Posts	Maximum core count support in latest Prime95 Is the maximum core count support for Prime95 24 ? If yes then how do we run it with CPUs like threadripper that has more than 24 cores?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Prime95 minor bug, "TortureThreads" not checked for maximum threads	Explorer09	Software	1	2014-08-19 04:13
Maximum number of threads for Prime95	treesong	Information & Answers	11	2012-06-18 13:35
Prime95 featured in Maximum PC!	ixfd64	Software	10	2010-05-31 15:21
latest fedora core 3 kernels causes segfault	blackguard	Linux	1	2005-07-06 01:05
Is 23.8.1 the latest Version of Prime95?	Bundu	Software	1	2004-11-03 23:18

2021-09-09, 15:26	#4
kriesel "TF79LL86GIMPS96gpu17" Mar 2017 US midwest 2⁶·101 Posts	Welcome to the forum. It's understandable you'd not be familiar with the following since you're new here. Just out of curiosity, where did the idea of 24 cores as a maximum for prime95 / mprime come from? Drkirkby has posted in various locations about running mprime on a dual-26-core system. Madpoo on dual-14 earlier. Some of us have run mprime or prime95 on KNL Xeon Phi with 64 or 68 actual cores, and tested what level of HT might be beneficial versus fft length. And posted benchmark results. There are whole threads about Xeon Phi. And posts in draft in the reference info.