command.c: gm benchmark iterations and duration

Hi,

gm benchmark has 2 options, but we can use only one of them.
I think we should state this in "gm benchmark -help":

static void BenchmarkUsage(void)
{
  static const char
    *options[]=
    {
      "-duration duration  duration to run the benchmark (in seconds)",
      "-iterations loops   number of iterations to execute",
      "Note that you can only specify one of the parameters, not both at a
time"
      (char *) NULL
    };
[snip]
}

And in function BenchmarkImageCommand, as of 1.3 now, the benchmark results
are as follows:

# magick/command.c
MagickExport unsigned int BenchmarkImageCommand(ImageInfo *image_info,  int
argc,char **argv,char **metadata,ExceptionInfo *exception) {
[snip]
      (void) printf("Results: %ld iter %.2fs user %.2fs total %.2f iter/s
(%.2f iter/s cpu)\n",
                    iteration,user_time,elapsed_time,rate_total,rate_cpu);
[snip]
}

but I think sometimes average time is not enough, we need to know deviation
of times
to see how balance the elapsed time is.

Iteration per second ( iter/s) is not as intuitive as s/iter( Average time
for one iteration- i.e one
benchmark command - to be done).

If anyone think it worths, I can do the code.

------
CF.  gm benchmarck output:
[vuhung@tmp]$gm benchmark -duration 30 -iterations 2 convert real_1.png
real_1.jpg
Results: 1 iter 0.00s user 0.00s total 1000000000000.000 iter/s
gm benchmark: Unrecognized command 'iterations'. Use -help for a usage
summary or see manual..
[vuhung@tmp]$gm benchmark -help
GraphicsMagick 1.1.10 2007-09-19 Q8 http://www.GraphicsMagick.org/
Copyright (C) 2002-2007 GraphicsMagick Group.
Additional copyrights and licenses apply to this software.
See http://www.GraphicsMagick.org/www/Copyright.html for details.

Usage: gm benchmark options command ...
Where options include one of:
  -duration duration  duration to run the benchmark (in seconds)
  -iterations loops   number of iterations to execute
Followed by some other GraphicsMagick command
gm benchmark: Improper arguments supplied, please see manual.
[vuhung@tmp]$

[vuhung@aoclife tmp]$ gm benchmark -iterations 2 convert uen_5710.jpg
uen_5710.png
arg: -iterations
iterations = 2
Results: 2 iter 24.95s user 24.97s total 0.08 iter/s (0.08 iter/s cpu)
[vuhung@aoclife tmp]$ time gm convert uen_5710.jpg uen_5710.png

-- 
Best Regards,
Nguyen Hung Vu ( Nguyễn Vũ Hưng )
vuhung16plus{remove}@gmail.dot.com
<vuhung16plus%7Bremove%[email protected]>, YIM: vuhung16 , Skype:
vuhung16dg
Japan through an eye of a gaijin:
http://www.flickr.com/photos/vuhung/tags/fav/

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