Question
Morgan Stanley
IN
Last activity: 1 Nov 2016 3:00 EDT
WHY: Caching happens only when a rule is accessed 3 times
I have read an article about the caching mechanism in PRPC which states that caching of a rule happens only if its accessed for 3 times.
Any reason for setting the count as 3?
Accepted Solution
Pegasystems Inc.
US
The setting of three is arbitrary and has been chosen as the most effective OOB configuration. You can tune this (along with other cache related parameters) using prconfig file and "cache/probationthreshold".
As I understand, even if you set this to 0, it will still result in rules having to be accessed twice before they are cached. The probation policy keeps rare rules from filling up your rule cache. First access puts a rule on "probation" to be cached, second access will see if subsequent access count has exceeded "cache/probationthreshold".