On Fri, 2016-02-26 at 12:40 -0600, Ranjan Maitra wrote: > > I don't claim to be an expert but at first glance I wonder if > you've > > defined what you mean by efficiency. Execution time? Program size? > > Memory locality (affects virtual memory performance) etc. > > I responded to this on another thread, but I am interested in the > amount of time taken by a program in executing a set of instructions. > If that includes memory allocation, etc, then fine.
Sorry, still not clear. Memory allocation is done by a combination of library functions and system calls. You need to know what you're trying to measure if your measurements are going to mean anything. The numbers you get can be change a lot between a first run and subsequent runs of the same program (because of cache effects), so you need to decide how much that matters. > > You might want to read some of the extensive literature on > > benchmarking. > > I have found the literature extremely confusing and unclear. Perhaps if you asked specific questions about what you find confusing, people could help you understand. > OK, is there a way to calculate the FLOP instructions in C? What do you mean "calculate the FLOP instructions"? Are you trying to evaluate an algorithm or benchmark an implementation? These are two different things. You can compare algorithms theoretically or by measurement, but only measurement will work for implementations. You can count each floating point instruction generated by the compiler by looking at the binary code, but maybe you want to count every instruction during execution, or see which instructions take longer, or just measure the total execution time of the algorithm on a given set of input. All of these things are different and need different techniques to measure them. The degree of accuracy you need will also have an effect. poc -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
