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an alert message to a specified computer.
Start Performance Data Log Runs an existing counter log. Run This Program Specifies a program to run when an alert is triggered. Click the Command Line Arguments button to add commandline arguments that provide additional information. For example, in Figure 20-14, selecting Alert Name, Counter Name, and Limit Value adds the details shown in the Example box.
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Figure 20-14.
Adding arguments to the alert to produce additional information.
Permissions for Counter Logs, Trace Logs, and Alerts
To create or modify a log or alert, you must have Full Control permission for the registry entry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \SysmonLog\LogQueries. Administrators are assigned this permission by default, and they can grant this permission to users in Regedit.exe. To run the Performance Logs and Alerts service, you must have permission to configure or start services on the system. Administrators are assigned this permission by default and can grant this permission to others using Group Policy. (The built-in groups Performance Log Users and Performance Monitor Users are useful for this.) To log data for a remote computer, the Performance Logs and Alerts service must run under an account that has access to that remote system. The service runs in the background after a log or alert is configured and running.
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Part VI Tuning and Troubleshooting
Real World Tuning and Testing Strategies Before starting System Monitor or Performance Logs and Alerts on the computer you are monitoring, turn off screen savers and stop services that are not essential to monitoring the system. Other best practices include the following:
Set up Performance Logs and Alerts to monitor and report data
on counters at regular intervals, such as every 10 to 15 minutes.
Make only one change at a time. Bottlenecks can be caused by
one component, or they can be the result of a series of faults. Making multiple changes at once can make it impossible to assess the impact each change has on the system.
Keep a record of changes you make, and repeat the monitoring
process after every change. Changes can affect other resources, and keeping records helps to determine the effect of each change and whether additional changes are necessary.
Compare programs that run over the network against those that
run locally. This tells you whether network components might be playing a part in performance problems.
Pay regular attention to event logs. Some performance problems
generate output into Event Viewer.
When logging data through Performance Logs and Alerts,
exclude times that include start-up events. Start-up events tend to skew overall performance results because they show temporarily high values.
Monitoring Memory Usage
Memory usage is usually the first item to look at when experiencing performance problems. If you find that your system is paging frequently, you probably need more memory. Some paging is expected to expand memory, but too much paging is a drain on system performance. Note Paging is used to free memory for other uses by moving fixed-size blocks of data and code from RAM to your disk in units called pages. Before monitoring memory usage, perform a few checks. For example, verify that your system has the recommended amount of memory for running the operating system as well as other applications and services. If you don t know
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Monitoring and Fine-Tuning Performance
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what the memory requirements are for a process, you can discover its working set within System Monitor. Shut the process down and observe the effect on paging activity. The amount of memory that is freed when you terminate a process is the amount of memory the process was using. Note
A working set is the portion of physical memory allocated to each program running on the computer.
Recommended Counters
To check for possible memory leaks or bottlenecks, monitor these counters:
Memory\ Pages/Sec Displays the number of pages written to or read
from disk to resolve hard page faults. A hard page fault occurs when a process requires code or data that must be retrieved from disk rather than from its working set or elsewhere in physical memory. If this value is above 20 per pagefile, you need to research paging activity and make adjustments as necessary. A high value for this counter might be more indicative of a paging problem than a memory problem.
Memory\ Committed Bytes Displays the number of committed bytes
of virtual memory on your system and is an instantaneous counter. Monitor this counter, along with Memory\ Available Bytes, over a period of time if you suspect a memory leak.
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