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Hello Kernel Developers,
I have run a very trivial program called loops=2Ec:
oinclude <math=2Eh>
oinclude <sys/types=2Eh>
oinclude <stdio=2Eh>
odefine MAXLOOPS 60000000L
main()
{
unsigned long i =3D 0L;
double x =3D 0=2E0;
time_t start =3D time(NULL);
while(i++ < MAXLOOPS) {
x =3D sin(x/(i+1));
}
printf("%ld\n", time(NULL) - start);
return 0;
}
/* compile gcc loops=2Ec -O2 -lm -o loops */
on various platforms=2E Here are the timings of 10 instances of loops
run concurrently on otherwise idle machine:
1=2E Pentium 200MHz, Linux 2=2E0=2E32: 6 seconds
2=2E IBM ThinkPad 755c, Linux 2=2E0=2E32: 46 seconds
3=2E IBM J40, 2proc, AIX 4=2E1=2E5: 177 seconds
4=2E IBM SP node, running some (??) RISC 135MHz, 8proc: 42 seconds
5=2E Sequent SE20, 6proc x P100, ptx 4=2E4=2E1: 70 seconds
6=2E Sequent SE20, 2proc x P66, ptx 4=2E1=2E2: 269 seconds
The IBM-related guy who installed the SP node was quite amazed to see
that his new fresh (half-a-million-worth) 8-processor SP node can just
about beat my old cheap laptop=2E Needless to say, he was converted to
Linux immediately=2E ;)
Regards,
Tigran=2E
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