Posts by Luminescence

1) Message boards : Number crunching : Trial Factoring (Message 9372)
Posted 10 Dec 2023 by Luminescence

You can ignore that:

The current jobfile only contains <task> <application>mfaktc-win-64.exe</application> <append_cmdline_args/> //this config is empty </task>

You should add this to your app_config.xml

<cmdline>-d $GPU_DEVICE_NUM</cmdline>

Is this only for mfaktc or mfakto too? Can it work with multi-GPU?

Looking at mfakto's source, it should work as well. Takes the same -d argument.

Unfortunately I can't test this stuff, as I don't have a multi-gpu system. Not too sure if it works with the app_config.xml, someone else would have to try.

2) Message boards : Number crunching : Trial Factoring (Message 9370)
Posted 10 Dec 2023 by Luminescence

I've looked into the "device 0" issue.

Under https://boinc.berkeley.edu/trac/wiki/WrapperApp it is stated:

command_line
command-line arguments to be passed to the worker program. This string is macro-substituted as follows:
$NTHREADS is replaced with the number of CPUs the client is allocating for this job.
$GPU_DEVICE_NUM is replaced with the device number of the GPU allocated to this job.

The current jobfile only contains

<task> <application>mfaktc-win-64.exe</application> <append_cmdline_args/> </task>

mfaktc ignores any command-line arguments it doesn't know, so it ignores the appended

--device N

passed to the wrapper.

Could the following change to the jobfile work?

<task> <application>mfaktc-win-64.exe</application> <command_line>-d $GPU_DEVICE_NUM</command_line> </task>

The wrapper should replace $GPU_DEVICE_NUM with the device number it is passed from the BOINC client and mfaktc recognizes the argument -d.

Otherwise it would be trivial to get mfaktc to recognize --device.

3) Message boards : Number crunching : Trial Factoring (Message 8624)
Posted 6 Jan 2023 by Luminescence

Thx for the hint, I have updated a new app version with the latest ini file, also used a very old file from yesterday as the wrapper.

And thx for compiling the app, its working without the dll files.

Sweet!

The DLL insanity was a real pain if you did not have the toolkit installed.

4) Message boards : Number crunching : Trial Factoring (Message 8622)
Posted 6 Jan 2023 by Luminescence

Can you change the mfaktc.ini configuration? GPU Sieve Size is set to 64, but the version supports up to 2047. There is quite a bit of performance to be gained with that change.

Not to mention the godawful coil whine my 4090 produces with this low amount.