On a multi core CPU, like many newer AMD and Intel processors, yafu takes as many cores as BOINC will allow. We need a way to limit yafu to some lower number of cores, somehow. Other projects need CPU cores to run, but yafu takes them all.

Preferences on web site is ideal. 2, 3, 4, 5, 6... max cpu cores to run

Copy the line below in notepad, name it app_config.xml
and place this app_config.xml file in your Yafu directory:

<app_config>
<app_version>
<app_name>yafu</app_name>
<plan_class>mt</plan_class>
<avg_ncpus>2</avg_ncpus>
<cmdline>--nthreads 2</cmdline>
</app_version>
</app_config>