On Wed, 11 Mar 2009 08:08:57 -0400, Bill Fairchild wrote: > >The GTF hook for the event class will fire regardless of how finely you are >filtering. If you are tracing I/O interrupts for only two printers' device >numbers, then the hook will fire for every I/O interrupt. ... > >Once you have incurred all the overhead of getting through the filter, the >code to trace the I/O request is probably not very much additional overhead, >given that you have to go through at least some of the filtering logic for >every I/O interrupt regardless of device number or device class. ... > >I think you will have a lower total overhead if you have only one instance of >GTF that is defined to trace events from either of the two printers involved. > But then he might need to trace twice as long before the event of interest occurs, incurring the GTF hook overhead during that longer time.
>Your mileage may vary. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
