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TIBCO Rendezvous® 8.8.0

# Before You Test

Warning | Before running Rendezvous performance assessment software, read this section carefully.

## Test in an Insulated Environment

We strongly recommend that you run all performance tests in a network environment that is insulated from other Rendezvous applications and other network traffic.

Consider these two important benefits of an insulated environment:

| • | Insulation prevents performance assessment message traffic from disrupting deployed applications.

| • | Insulation ensures that traffic from other applications does not skew performance measurements.

Testing in a physically isolated network yields the most accurate measurements.

When physical isolation is impractical, you can still obtain valid measurements by insulating tests within unused multicast addresses. However, in this arrangement, `rvperfm` traffic can still affect the performance of other deployed network applications.

## rvd Reliability

Warning | To ensure accurate and efficient testing, it is critical that you first disable the reliable message storage feature of `rvd`. To disable reliability fordaemons, manually start `rvd` (or `rvrd`) with the command line parameter `-reliability 0`. This zero value instructs `rvd` not to retain outbound messages in case they are needed for retransmission. For more information, see Reliability and Message Retention Time.

`rvperfm` attempts to determine the carrying capacity of the network. To do so, it tests whether the network and a set of receivers can absorb a run of messages without missing any packets. The reliable delivery feature of `rvd` defeats this purpose; it compensates for transient network problems by retaining and retransmitting packets. This behavior is often beneficial in a production environment, but in a performance testing situation it is counterproductive—by compensating for network problems, it delays detection of those problems. This delay falsifies the results of performance testing, and unnecessarily prolongs the testing period.

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