ACC compiler for CPU performance

[j773303]

Does anybody has the experince about how to improve CPU performance in hpux rx2600? I has written C++ program man I'm not sure how to compiler codes, may I know which compiler option can enhance CPU performance? Thanks.

[A. Clay Stephenson · Accepted solution]

I assume that you have turned on the maximum optimization and enabled parallel operations. You really are much too vague about your problem for anyone to help you much. It would help to at least know what your application is in general terms.

In general, compilers are so good now that you don't normally have to worry about these things but I'm sure there are exceptions.

It's time to add profiling
to your code to see where it's spending the most time. It's been my experience that in almost all cases, poor performance has little to do with the compiler and much to do with the efficiency of the algorithms.

[rick jones]

As pointed-out - profiles. For example, such as are produced by say Caliper. Higher levels of optimizations would include things like PBO - Profile Based Optimization. You might find some ideas in the compiler options used for some of the components of HP's SPECcpu2000 numbers. I believe that a few of the components of SPECint2000 are C++ and perhaps they do things similar to your application.