ARM vs. x86 speed comparison

Moderators: Site Moderators, FAHC Science Team

ARM vs. x86 speed comparison

Postby SilvioMartin » Mon Feb 08, 2021 8:27 pm

I found this morning, that my iMac was working on a WP of a project, for which my Raspberry Pi rack did a lot of WPs. So a good chance to compare the speed. I assume that all WPs of a project require the same effort. Here is an run from a Raspberry Pi 4B, which has a 1.5 GHz quad core ARM processor. FAH uses all four cores and there is nothing else running on the Raspberry Pi:

Code: Select all
00:12:21:WU01:FS00:0xa8:Project: 16923 (Run 1, Clone 43, Gen 42)
14:47:11:WU01:FS00:0xa8:Completed 500000 out of 500000 steps (100%)

So it needed 52,490 seconds. If it would run on a single core, it would probably need 4x more time. Running at 1 GHz would give another factor of 1.5. So after normalizing to 1 GHz and a single core, it would need 314,940 seconds. The iMac has a 3.4 GHz quad core Intel i5 processor. FAH uses 3 cores and there is nothing else running, which would need a lot of computing power:

Code: Select all
05:19:08:WU00:FS00:0xa8:Project: 16923 (Run 51, Clone 93, Gen 261)
06:46:03:WU00:FS00:0xa8:Completed 500000 out of 500000 steps (100%)

It took just 5215 seconds. Normalizing to 1 GHz and a single core gives a factor of 3.4 x 3, thus a total of 53,193 seconds. On both systems there is a 64 bit OS running on a 64 bit processor. So no need to normalize anything here.

For this type of task, the Intel + MacOS architecture looks around 6 times faster than the ARM + Raspberry Pi OS architecture after normalizing to the same number of cores and processor clock rate.
My Raspberry Pi folding rack:
Posts: 27
Joined: Thu Sep 24, 2020 7:06 pm
Location: Oberhausen, Germany

Re: ARM vs. x86 speed comparison

Postby bruce » Mon Feb 08, 2021 8:58 pm

I think the big/little differences probably need to be normalized. I'm not sure the best way to do that. Maybe run projects just on BIG threads.
Posts: 20535
Joined: Thu Nov 29, 2007 11:13 pm
Location: So. Cal.

Re: ARM vs. x86 speed comparison

Postby JimboPalmer » Mon Feb 08, 2021 11:01 pm

There are some 11 Generations of i5 CPUs. some only support SSE2, some support AVX_256, and some support AVX2-256 as their SIMD instruction sets.

If SSE2 is normalized to 1, AVX-256 should be just over 2, and AVX2-256 should be around 2.6, sadly all will be called i5. Your log will show which instruction set was chosen.

The RPi should use the NEON SIMD instruction set.
Tsar of all the Rushers
I tried to remain childlike, all I achieved was childish.
A friend to those who want no friends
Posts: 2177
Joined: Mon Feb 16, 2009 5:12 am
Location: Greenwood MS USA

Return to Software for ARM hardware

Who is online

Users browsing this forum: No registered users and 1 guest