On Fri, 26 Feb 2016 17:29:58 +0000 "Patrick O'Callaghan"
<pocallaghan(a)gmail.com> wrote:
On Fri, 2016-02-26 at 08:31 -0600, Ranjan Maitra wrote:
> Hi,
>
> Disclaimer: This is clearly marked OT, with the only connection to
> this group being the fact that I am running F23 on a 20-core Dell
> T5810 @3.1 GHz each and 64 GiB memory. My OT queries over the past 13
> years (almost) here have elicited great wealth of information so I am
> posing here.
>
> So, I am trying to compare two kinds of methods in a C program. Both
> are written as efficiently as possible (assumed because no point
> otherwise). I would like to know which of these is more efficient. I
> have been using get_rusage but I was wondering whether there is a
> better way?
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.
You might want to read some of the extensive literature on
benchmarking.
I have found the literature extremely confusing and unclear.
> Separately, is there a way to get the number of floating point
> instructions in C? Both FLOPS and MIPS?
Instructions executed on every code path? On the most likely code path?
Remember: MIPS = Meaningless Indicator of the Performance of Systems.
OK, is there a way to calculate the FLOP instructions in C?
Many thanks and best wishes,
Ranjan
____________________________________________________________
FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family!
Visit
http://www.inbox.com/photosharing to find out more!