Hi,

I seen on my NVIDIA 2070 Super that only up to 60% GPU and 5% Memory are used.

Is there a way to run for example 2 WU's at the same time?

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Yes. Create an app_config.xml file in the project folder and put the following in it:

<app_config>
<app_version>
<app_name>mlds-gpu</app_name>
<plan_class>cuda10200</plan_class>
<avg_ncpus>1</avg_ncpus>
<ngpus>.5</ngpus>
</app_version>
</app_config>

The number between ngpus determines what percentage of the GPU each task takes. so 0.5 for 2 per gpu, 0.25 for 4 per gpu etc.
Same for cpu's allocated using the avg_ncpus.
Refer to https://boinc.berkeley.edu/wiki/BOINC_Data_directory to find your data directory if unknown.
Refer to https://boinc.berkeley.edu/wiki/Client_configuration for further information on config files.