I thought -w 3 might be worth revisiting since the speedups seem to have
stabilized some...I only tested this with "-m 1" since prior testing showed
no improvement for more threads. I am going to test -m 2 -w 3 and will show
those results later.
On two machines -- one Windows 7 desktop several years old with Dual
x5450@3Ghz which we'll call M1. Newer HP Envy laptop with I7-4702MQ @2.2Ghz
which we'll call M2.
Using r4940 and testing wisdom 2 & 3 (modified the code and recompiled for
that).
Numbers here reported after a few dozen iterations so is a pretty accurate
average.
Mike W9MDB
M1, M2
1.50,1.03 Jt9 -w 2
1.44,1.01 Jt9 -w 3
1.08,0.79 Jt9_omp -w 2
1.06,0.73 Jt9_omp -w 3
So -w 3 gives a 3.8% improvement on the old machine for jt9 and a 1.9%
improvement on the new laptop.
And -w 3 gives a 1.9% improvements on the old machine for jt9_omp and a 7.6%
improvement on the new laptop.
Mike W9MDB
#include <stdio.h>
#include <math.h>
int main(int argc,char *argv[])
{
char cmdbuf[4096];
double total=0;
int n=0;
int nthreads=1;
char buf[4096];
char *cmd="jt9";
if (argc > 1) {
nthreads = atoi(argv[1]);
}
if (nthreads > 0) {
cmd = "jt9_omp";
}
printf("Testing %s with %d thread%c\n",cmd,nthreads,nthreads==1?'
':'s');
sprintf(cmdbuf,"TimeMem-1.0.exe %s -p 1 -d 3 -w 3 -m %d
130610_2343.wav | grep Elapsed | cut -f2 -d: >doit.txt",cmd,nthreads);
while(1) {
system(cmdbuf);
FILE *fp=fopen("doit.txt","r");
fgets(buf,sizeof(buf),fp);
fclose(fp);
double sec = atof(buf);
++n;
total+=sec;
double avg = total/n;
if (sec > avg*1.5) {
printf("\nlong run %.2f avg=%.2f\n",sec,avg);
}
printf("%d sec=%.2f avg=%.2f\r",n,sec,avg);
fflush(stdout);
}
}
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