This alarm is activated when the system up time exceeds the value specified in the related threshold.
The Windows CPU alarm is activated when the average CPU utilization of the system exceeds a threshold. This value is taken over a specific number of refresh intervals (by default, four).
Sustained high CPU utilization can adversely effect the performance of the system.
When this alarm is current, you should:
This alarm becomes active when a process approaches the two gigabyte virtual address space limit imposed by Windows. Processes attempting to exceed this limit may fail catastrophically. Any process that approaches this limit should be closed to free the address space and then restarted if required.
Regardless of the amount of physical memory in your system, Windows uses a virtual address space of 4 GB, with 2 GB allocated to user-mode processes (for example, applications) and 2 GB allocated to kernel-mode processes (for example, the operating system and kernel-mode drivers).
NOTE: Some versions of Windows Server allow users to change this ratio to 3 GB for user-mode and 1 GB for kernel-mode processes via the /3GB switch in boot.ini. Versions that support this switch are:
Windows Server 2003 x64 Editions do not support the /3GB switch. On these systems:
Thus this alarm is disabled for 64 bit systems.
This alarm is activated when free virtual memory drops below a threshold.
When this alarm is current you should:
Look at the Processes page on the Processes drilldown. Look at the VM Size (MB) column to see which applications are using the most virtual memory.
Some applications (such as Microsoft Exchange or Microsoft SQL Server) can have their memory utilization limited.