Que'est-que c'est "HIS"? Horrible name to Google for, of course. I'm guessing it's a HIStogram generator of some sort?
On Wed, Apr 15, 2009 at 11:08 AM, Edward Jaffe <[email protected]> wrote: > Miklos Szigetvari wrote: >> >> We have converted our complex C++ document generation application to 64 >> bit mode. >> With different test cases, we see the average CPU time is about 4% >> higher in 64 bit mode as in 32, > > This is not an altogether unexpected outcome. There are many possible > reasons: your programs and data areas might be larger--thus taking longer to > load/move/page, address translation involving a region 3rd will be slower > than segment-only translation (imagine what would happen with region > 2nd--stay below 4TB!), and so forth. All code might not be apples to apples > either. For example, if any service you're calling uses BAKR for 64-bit > callers, yet traditional STM/LAM, STAM/LAM, for 31-bit callers, it will run > noticeably slower. > > It might be worth using HIS or a commercial execution analyzer product to > look for program "hot spots". We did that and found *one* instruction that > was so slow, and executed so often, it brought our product to its "knees". > Replacing that one instruction with a multi-instruction equivalent made the > performance problem disappear. (Of course, this was an assembler language > program. You might not have as much control with C++ over such things. But, > the analysis can still be valuable.) > > -- > Edward E Jaffe > Phoenix Software International, Inc > 5200 W Century Blvd, Suite 800 > Los Angeles, CA 90045 > 310-338-0400 x318 > [email protected] > http://www.phoenixsoftware.com/ > > ---------------------------------------------------------------------- > 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 > ---------------------------------------------------------------------- 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
