Path: utzoo!mnetor!uunet!husc6!bloom-beacon!gatech!udel!burdvax!bpa!cbmvax!vu-vlsi!lehi3b15!lxn!chris
From: chris@lxn.UUCP (Christopher D. Orr)
Newsgroups: comp.unix.questions
Subject: Determining system memory
Message-ID: <248@lxn.UUCP>
Date: 30 Mar 88 20:18:57 GMT
Organization: Alcyone Inc., Bethlehem PA
Lines: 39


I have been trying to find a nice, clean way to determine system
memory under SYS V 2.2.  I have come up with two solutions to this
problem.  However, there must be a cleaner/faster way :-).

Solution 1:  The command 'wc -c /dev/mem' seems to work though it
             takes *FOREVER* on systems with large amounts on memory.

Solution 2:  The following 'C' program reports system memory much
             faster that Solution 1, but is still fairly slow:
	     #include <stdio.h>
	     #include <fcntl.h>

	     extern int errno;
	     static char BUF[32768];

	     void main()
	     {
	     long int L;
	     int M;
		 
	     M = open("/dev/mem",O_RDONLY);
	     if (M < 0) 
	      {
	        printf("Error: unable to open /dev/mem. errno=%d\n",errno);
	        exit(1);
	      }

	     for (L=0;read(M,BUF,16384) == 16384 ;++L);
	     printf("Memory Size: %ld\n",L * 16384);
	     }

Any other solutions are welcome (especially those that are faster :-)

---
Christopher D. Orr                  | US MAIL: Alcyone Inc.
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