Using Larger Trace Buffers.

To increase the size of trace buffers beyond the default value, use the Prism command

(prism all) tnffile filename size

where size is the size in Kbytes of the output file for each process. The default value is 128 Kbytes.

By default, trace buffers are placed in /usr/tmp before they are merged into the user's trace file. If this file partition is too small for very large traces, buffers can be redirected to other directories using the PRISM_TNFDIR environment variable. In order to minimize profile disruption caused by writing very large trace files to disk, one should use local file systems such as /usr/tmp and /tmp whenever possible instead of file systems that are mounted over a network.

While Prism generally cleans up trace buffers after the final merge, abnormal conditions could leave large files behind. Users who abort profiling sessions with large traces should check /usr/tmp periodically for large, unwanted files.