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2. Change the value of the parameter by starting with 100.
3. Save the changes and restart the IBM HTTP server.
The recommended method is to start with a size of 100, then increase as necessary. An HTTP error message of type
503 (a refused connection) is a good indicator for the need to increase the value.
There are two ways to find how many threads are being used under load. The following procedures show how this
is done.
Checking for thread usage with the Windows 2000 Performance Monitor
Use the following procedure to check thread usage with the Windows 2000 Performance Monitor:
1. Select Start -> Programs -> Administrative Tools -> Performance Monitor.
11. In Performance Monitor, click Edit -> Add to chart. Then set the following:
• Object: IBM HTTP Server
• Instance: Apache
• Counter: Waiting for connection
To calculate the number of busy threads, subtract the number waiting (Windows 2000 Performance Monitor) from
the total available (ThreadsPerChild).
Checking for thread usage using IBM HTTP Server server-status
Use the following procedure to check thread usage with IBM HTTP Server server-status:
1. Edit the IBM HTTP Server file httpd.conf by removing the comment character "#" from the following lines:
#LoadModule status_module modules/ApacheModuleStatus.dll
#<Location /server-status>
#SetHandler server-status
#</Location>
2. Save the changes and restart the IBM HTTP server.
In a Web browser, go to the following URL and click Reload to update status: http://yourhost/server-status.
Alternatively, if the browser supports refresh, go to http://yourhost/server-status?refresh=5 to refresh every 5
seconds. You should see 5 requests currently being processed, 45 idle servers.
MaxKeepAliveRequests
This parameter specifies the maximum number of requests to allow during a persistent connection.
Use the following procedure to change this parameter:
1. Edit the IBM HTTP Server file httpd.conf located in the directory
IBM_HTTP_Server_root_directory/conf.
2. Change the value of the parameter.
3. Save the changes and restart the IBM HTTP server.
The recommended value is 0. This will allow for an unlimited amount of requests.
MaxRequestsPerChild
This parameter specifies how many requests each process will handle before it exists and another process is started.
Appendix A: LMS Performance and Fine-tuning Information 113