On 29 Dec 2010 at 14:25, patsy wrote:
> Hello list,
>
> I have written a program and would like to trace its memory usage as it runs
> and output the data to a file for easy logging/comparison/graphing.
>
> getrusage(2) looks as though it would be appropriate for this. Unfortunately
> I seem to be misunderstanding how it should be used, since I would not expect
> the program below to output five 0's, yet it does on 4.8-release (i386) and a
> slightly out of date 4.8-current (amd64).
>
> Could somebody give me a hint as to where my misunderstanding lies or how
> else I might track the memory usage of my program?
>
> Many thanks,
> Patsy
>
>
>
> #include <stdio.h>
> #include <sys/time.h>
> #include <sys/resource.h>
>
> int main()
> {
> struct rusage val;
> int retval;
> long buf[10000];
>
> retval = getrusage(RUSAGE_SELF, &val);
>
> printf("retval = %d\n", retval);
> printf("mem = %ld\n", val.ru_maxrss);
> printf("mem = %ld\n", val.ru_ixrss);
> printf("mem = %ld\n", val.ru_idrss);
> printf("mem = %ld\n", val.ru_isrss);
>
> return 0;
> }
>
Got my attention -- discovered a missing declaration in
/usr/include/sys/resource.h
on my SVR4 system -- added it from Solaris, compiled your program, an on SVR4
I get:
# ./rusage
retval = 0
mem = 0
mem = 0
mem = 0
mem = 0
Anyway, I appreciate discovering the omission for the structure declaration in
the
header file (not obsd however)
Michael
