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How to limit the processes for a specific queue in Torque
One can set the max_running parameter in Torque. For example:
qmgr -c "set queue foo max_running=20"
You might think you could modify the max_queuable setting as well, but such a setting will be ignored by the gLite 3.1 WMS, while it is respected by the EMI-1 WMS:
The setting then may lead your CE to be overloaded when jobs keep getting submitted to that queue by gLite 3.1 WMS nodes. So, for the time being it is advised not to limit the number of jobs that can be queued.