iSeries / AS400 FAQ : (Category) Operations : Is WRKACTJOB a resource hog?
Q. I’ve often heard that WRKACTJOB takes up a lot of CPU power. Why? A. Over the years there have been changes to the way WRKACTJOB works. What was once true for DSPACTJOB on System/38 is no longer true for WRKACTJOB. Unfortunately people still pass on the old recommendations. In the following paragraphs I will attempt to provide an up to date description of WRKACTJOB. When you exit WRKACTJOB by using Enter, F3, or F12 you have totally ended WRKACTJOB. The statistics reported by WRKACTJOB are not collected by WRKACTJOB. The collection of those statistics is always done for every job in the system by LIC. This collection occurs even when WRKACTJOB has never been used on the system. WRKACTJOB does keep an internal space somewhere to save the current statistics so that it can report the changes the next time it is used within the same job. You can reset those statistics by using F13=Reset statistics or by using the RESET(*YES) parameter on the command.
