WebSphere Virtual Enterprise (formerly Operations Optimization), Version 6.1
             Operating Systems: AIX, HP-UX, Linux, Solaris, Windows, z/OS


Tuning ODR persistent requests

Tune the persistent connection settings for ODR performance to minimize time spent in setting up new connections and taking down older connections during a barrage of requests. Primarily, this tuning is relevant to the connections between the ODR and the application servers.

Before you begin

Modify your JVM heap settings. See Modifying the JVM heap size for the on demand router .

About this task

Adjusting the application server's maximum persistent requests lets the ODR reuse the connection to the application server for as long as it can. To do this, adjust the ODR settings in the transport chains. You should set it high enough to avoid having to bring down and recreate a connection during a barrage of requests, so set the value to at least the number of requests in a single barrage of request. The barrage can be a single page with associated datat with a long think time, or a series of pages and associated data in short succession. If you set a value high than this, it will not negatively affect performance provided the persistent timeout is set appropriately to close idle connections.

The following steps show you how to adjust the application server's maximum persistent requests per connection.

Procedure

  1. In the administrative console click Servers > On Demand Routers odr_name > Ports > Details. Click View associated transports for the port whose transport chains you want to view.
  2. Select PROXY_HTTP_ADDRESS.
  3. Click PROXY_HTTP_ADDRESS.
  4. Click HTTP inbound channel.
  5. Ensure that Use persistent (keep-alive) connections is checked.
  6. Set Maximum persistent requests per connection to -1 . Setting this value very high to infinite (-1) yield the best performance.



Related tasks
Creating and configuring ODRs
Tuning ODR maximum connections
Modifying the JVM heap size for the on demand router
Tuning the on demand router (ODR)
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Last updated: Oct 30, 2009 6:17:06 PM EDT
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