Monitoring and Tuning Your Server
Monitoring and Tuning Your Server |
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When the amount of available memory falls below about 4 MB, the system attempts to provide more available bytes by taking memory away from the working sets of processes. This strategy increases the rate of page faults, because each process must now retrieve data that was once in its working set either from disk or from elsewhere in memory. When the rate of page faults for a particular process rises, however, the system attempts to expand the working set of that process to lower the page fault rate. As the system tries to maintain this balance, the size of the working set of each process fluctuates accordingly.
If the system has sufficient memory, it can maintain enough space in the Inetinfo working set so that IIS 5.0 rarely needs to perform disk operations. One indicator of memory sufficiency is how much the size of the Inetinfo process working set varies in response to general memory availability on the server.
As Table 5.1 indicated, you can use the Computername\ Memory\ Available Bytes counter as an indicator of memory availability and the Computername\ Process\ Working Set: Inetinfo counter as an indicator of the size of the IIS 5.0 working set. Be sure to examine data collected over time, because these counters display the last value observed, rather than an average.
Tip You may want to have PerfMon alert you if the number of available bytes dips below about 5 percent of the amount of physical RAM on the server, or below a minimum of about 10 MB on small servers.