Path: utzoo!utgpu!utorvm!ryerson!acps5788
Organization: Ryerson - Academic Computing Services
Date: Saturday, 23 Mar 1991 15:24:27 EST
From: Roger Smith <ACPS5788@Ryerson.Ca>
Message-ID: <91082.152427ACPS5788@Ryerson.Ca>
Newsgroups: comp.sys.mac.programmer
Subject: Think C vs MPW C??

Hi
 I am in the process of writing a network simulation program which will have
 15 nodes and run .. until a steady state is assumed. I have both Think C
 and MPW C and have been trying various things under both,The Code i am
 including was run under both systems and the timings noted. The results
 seem to indicate that Think C runs faster am I doing something wrong?
 Why is there such a large Difference in the Loop Times? I am using the
 CC script file from the Macintosh Programmers WorkShop. Any Feedback is
 appreciated.

# Example 8-6: cc comand file
# Compiles and links a C program that runs under the MPW
# shell
# syntax:
#       cc -o toolname file.c
#

If {#} != 3 || "{1}" != "-o" ||6
 "{2}" =~ /%-E/ || "{3}"=~ /%-E/
 Echo "### {0} - Wrong parameters."
 Echo "# Usage - {0} -o toolname file.c"
 Exit 1
End

Set CLibs "{CLibraries}CRuntime.o"6
" {CLibraries}StdCLib.o"6
" {CLibraries}CInterface.o"6
" {CLibraries}ToolLibs.o"6
" {CLibraries}CSANELib.o"6
" {CLibraries}Interface.o"
C "{3}"

Link -w -o "{2}" -t MPST -c 'MPS ' "{3}.o" {CLibs}
Delete "{3}.o"

cc -o test test.c
test

---------- MPW C Results ------------
 Enter Number of Iterations 150000
Broke out of Loop after:  51.00 seconds
Number of Iterations: 57054

 Enter Number of Iterations 150000
Broke out of Loop after:  51.00 seconds
Number of Iterations: 57224

 Enter Number of Iterations 150000
Broke out of Loop after:  51.00 seconds
Number of Iterations: 56755

 Enter Number of Iterations 150000
Broke out of Loop after:  51.00 seconds
Number of Iterations: 57605

---------- Think C Results within Think C ------------

 Enter Number of Iterations 150000
loop used  44.00 seconds
Loop Size 150000

 Enter Number of Iterations 150000
loop used  45.00 seconds
Loop Size 150000

 Enter Number of Iterations 150000
loop used  45.00 seconds
Loop Size 150000

 Enter Number of Iterations 150000
loop used  44.00 seconds
Loop Size 150000

-----------Think C Results Run From Finder --------------

 Enter Number of Iterations 150000
loop used  45.00 seconds
Loop Size 150000

 Enter Number of Iterations 150000
loop used  44.00 seconds
Loop Size 150000

.... etc

--- C Code ---
#include <time.h>
#include <stdio.h>

#define MAXTIME 50

 void main(void)
 {
        time_t start,end;
        long int flag,n;
        double time_out;
        long t;

        flag = 0;
                printf(" Enter Number of Iterations ");
                scanf("%ld",&n);
        start = time(NULL);
        for(t=0; t < n; t++)
         {
            if (flag) break;
                end = time(NULL);
                time_out = difftime(end,start);
                    if (time_out > (double) MAXTIME) {
                         flag =1;
                          printf("Broke out of Loop after: %6.2f
seconds\n",time_out);
                          printf("Number of Iterations: %ld \n",t);
                }
         }

        end = time(NULL);
        time_out = difftime(end,start);
        if (!flag) {
                printf("loop used %6.2f seconds\n",time_out);
                printf("Loop Size %ld\n",n);
        }
 }