Full-Screen Operation Mode

Performance Toolkit causes additional paging and I/O operations compared to a standard VM system console with TERMINAL MODE set to CP. Response times should be similar to those experienced in an ordinary CMS machine. They can be improved by giving the system operator virtual machine a better dispatching priority and, if necessary, by using the 'SET RESERVED' command to reduce paging activity for that specific machine.

You may also have to give the Performance Toolkit operator machine a better dispatching priority if it has to handle many incoming messages in quick succession: the CP IUCV *MSG service sets a limit of 2048 messages in z/VM. If Performance Toolkit is too slow in receiving them, the remainder will be directly displayed on the operator's terminal. Although this should not normally happen, the situation might occur if another user generates messages very fast. You may face this situation when running a CP command which produces more than the maximum of output lines which *MSG can handle in your own machine (for example, a 'Q RDR ALL' command on a large system), and even the best dispatching priority is not going to change that.