LHC@home

In LHC-Prefs 8 is the max. number of tasks or no limit.
When setting no limit, the PC is flooding from the Server, because of the Boinc-bug!

Theory and ATLAS are limited server side to avoid swamping the clients with too many tasks.
ATLAS uses 4 * #cores, Theory ... (don't know).


On your 12 core computer you can use "3" #cores on the web prefs page to allow 12 ATLAS tasks to be downloaded.
Then use this app_config.xml:

<app_config>
   <app_version>
       <app_name>ATLAS</app_name>
       <plan_class>vbox64_mt_mcore_atlas</plan_class>
       <avg_ncpus>1.0</avg_ncpus>
       <cmdline>--memory_size_mb 3900</cmdline>
   </app_version>
</app_config>

Be aware:
ATLAS uses a 2nd memory configuration parameter that can't be modified via app_config.xml.
This limits the number of ATLAS tasks on your computer to 11 (may be less).

Could you please give me parameters to run single-core CMS?

Right now CMS does not send out jobs to prepare a WMAgent update.
See:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=4614&postid=50120

The days before they sent only 4-core tasks.
Computers that configured their VMs for less cores ran only empty envelope tasks without any scientific value.

Once the update is done you may check what they send and set your web prefs accordingly:
https://lhcathome.cern.ch/lhcathome/prefs.php?subset=project