Cannot get more than 2 CPU cores to work on one slot.

[InfiniteVoid]

Doesn't mater how many cores I set in slot, I always get message "WARNING:WU01:FS03:AS lowered CPUs from X to 2". I could fold stuff much faster if I could use 6 cores out of 8 I have. Is it because of WU limitation or it is with my configuration?

I run on Ubuntu 18.04. Here is some log from when I changed num of cores during work, but even if I start work with 8 cores, there is same message: "lowered CPUs from X to 2"

Code: Select all

08:06:53:WU01:FS03:Starting
08:06:53:WARNING:WU01:FS03:Changed SMP threads from 2 to 8 this can cause some work units to fail
08:06:53:WARNING:WU01:FS03:AS lowered CPUs from 8 to 2
08:06:53:WU01:FS03:Running FahCore: /usr/bin/FAHCoreWrapper /var/lib/fahclient/cores/cores.foldingathome.org/v7/lin/64bit/avx/Core_a7.fah/FahCore_a7 -dir 01 -suffix 01 -version 705 -lifeline 9194 -checkpoint 15 -np 2
08:06:53:WU01:FS03:Started FahCore on PID 15298
08:06:53:WU01:FS03:Core PID:15302
08:06:53:WU01:FS03:FahCore 0xa7 started
08:06:54:WU01:FS03:0xa7:*********************** Log Started 2020-04-16T08:06:53Z ***********************
08:06:54:WU01:FS03:0xa7:************************** Gromacs Folding@home Core ***************************
08:06:54:WU01:FS03:0xa7:       Type: 0xa7
08:06:54:WU01:FS03:0xa7:       Core: Gromacs
08:06:54:WU01:FS03:0xa7:       Args: -dir 01 -suffix 01 -version 705 -lifeline 15298 -checkpoint 15 -np
08:06:54:WU01:FS03:0xa7:             2
08:06:54:WU01:FS03:0xa7:************************************ CBang *************************************
08:06:54:WU01:FS03:0xa7:       Date: Nov 5 2019
08:06:54:WU01:FS03:0xa7:       Time: 06:06:57
08:06:54:WU01:FS03:0xa7:   Revision: 46c96f1aa8419571d83f3e63f9c99a0d602f6da9
08:06:54:WU01:FS03:0xa7:     Branch: master
08:06:54:WU01:FS03:0xa7:   Compiler: GNU 8.3.0
08:06:54:WU01:FS03:0xa7:    Options: -std=c++11 -O3 -funroll-loops -fno-pie -fPIC
08:06:54:WU01:FS03:0xa7:   Platform: linux2 4.19.0-5-amd64
08:06:54:WU01:FS03:0xa7:       Bits: 64
08:06:54:WU01:FS03:0xa7:       Mode: Release
08:06:54:WU01:FS03:0xa7:************************************ System ************************************
08:06:54:WU01:FS03:0xa7:        CPU: Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
08:06:54:WU01:FS03:0xa7:     CPU ID: GenuineIntel Family 6 Model 158 Stepping 9
08:06:54:WU01:FS03:0xa7:       CPUs: 8
08:06:54:WU01:FS03:0xa7:     Memory: 15.55GiB
08:06:54:WU01:FS03:0xa7:Free Memory: 6.62GiB
08:06:54:WU01:FS03:0xa7:    Threads: POSIX_THREADS
08:06:54:WU01:FS03:0xa7: OS Version: 4.15
08:06:54:WU01:FS03:0xa7:Has Battery: true
08:06:54:WU01:FS03:0xa7: On Battery: false
08:06:54:WU01:FS03:0xa7: UTC Offset: 2
08:06:54:WU01:FS03:0xa7:        PID: 15302
08:06:54:WU01:FS03:0xa7:        CWD: /var/lib/fahclient/work
08:06:54:WU01:FS03:0xa7:******************************** Build - libFAH ********************************
08:06:54:WU01:FS03:0xa7:    Version: 0.0.18
08:06:54:WU01:FS03:0xa7:     Author: Joseph Coffland <joseph@cauldrondevelopment.com>
08:06:54:WU01:FS03:0xa7:  Copyright: 2019 foldingathome.org
08:06:54:WU01:FS03:0xa7:   Homepage: https://foldingathome.org/
08:06:54:WU01:FS03:0xa7:       Date: Nov 5 2019
08:06:54:WU01:FS03:0xa7:       Time: 06:13:26
08:06:54:WU01:FS03:0xa7:   Revision: 490c9aa2957b725af319379424d5c5cb36efb656
08:06:54:WU01:FS03:0xa7:     Branch: master
08:06:54:WU01:FS03:0xa7:   Compiler: GNU 8.3.0
08:06:54:WU01:FS03:0xa7:    Options: -std=c++11 -O3 -funroll-loops -fno-pie
08:06:54:WU01:FS03:0xa7:   Platform: linux2 4.19.0-5-amd64
08:06:54:WU01:FS03:0xa7:       Bits: 64
08:06:54:WU01:FS03:0xa7:       Mode: Release
08:06:54:WU01:FS03:0xa7:************************************ Build *************************************
08:06:54:WU01:FS03:0xa7:       SIMD: avx_256
08:06:54:WU01:FS03:0xa7:********************************************************************************
08:06:54:WU01:FS03:0xa7:Project: 13832 (Run 0, Clone 3687, Gen 28)
08:06:54:WU01:FS03:0xa7:Unit: 0x0000002780fccb095e6d2a8e14d23b12
08:06:54:WU01:FS03:0xa7:Digital signatures verified
08:06:54:WU01:FS03:0xa7:Calling: mdrun -s frame28.tpr -o frame28.trr -x frame28.xtc -cpi state.cpt -cpt 15 -nt 2
08:06:54:WU01:FS03:0xa7:Steps: first=7000000 total=250000
08:06:55:WU01:FS03:0xa7:Completed 123112 out of 250000 steps (49%)

[Jesse_V]

Hi InfiniteVoid and welcome to the forum.

How long have you been seeing this message? I'm curious if it only occurs for workunits from project 13832 or if this is something that you've been seeing in general for a while now.

[JimboPalmer]

Here is a generic step by step guide to setting CPUs in F@H

In the taskbar to the lower right of the screen, you should see a F@H molecule icon, click it (you may need to click an Up Arrow to see it ^)

The second item in this menu is Advanced Control, click it

On this screen to the left is a Configure button, click it

Now you get a screen with a Slots tab, click it

On this white field should be a cpu item, click it and then click edit

By default F@H set the number of CPUs to -1 meaning let the software decide.
You can enter any number from 1 to the number of threads your CPU supports.
If you have GPUs, F@H reserves one CPU per GPU to feed it data across the PCIE bus.
F@H has difficulty with large primes and their multiples number of CPUs.
7 is always large, 5 is sometimes large, and 3 is never large. Try to choose a number that is a multiple of 2 and/or 3.
2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, etc. are good numbers of CPUs to choose.
5. 10. 15, 20 etc may work most of the time. Other numbers will bite you

Type the number you want, and click save. (i would choose 6 if I had a GPU that folds, and 8 if i didn't)

[Joe_H]

Also, any WU downloaded with a CPU setting will not be able to have its CPU sore usage increased above the number the WU was downloaded with. The setting will apply to the next WU downloaded. So if the WU was downloaded at a time that CPU:2 was set, then it will never run using more. However a WU downloaded at a higher number could be run for a time at CPU:2 and then returned to the original setting or one in between.