How to Determine Whether a Web Server Is Allocated Enough CPU Capacity

1. Use the prctl command to place a privileged (superuser-owned) resource control on the tasks that contain an httpd process. Limit each task's total number of LWPs to 40, and disable all local actions.

   # prctl -n task.max-lwps -v 40 -t privileged -d all `pgrep httpd`

   
   

2. Enable a system log global action on the task.max-lwps resource control.

   # rctladm -e syslog task.max-lwps

   
   

3. Observe whether the workload trips the resource control.

   If it does, you will see /var/adm/messages such as:

   Jan 8 10:15:15 testmachine unix: [ID 859581 kern.notice] NOTICE: privileged rctl task.max-lwps exceeded by task 19