I have done some tests on my machine, the machine has both Linux and FreeBSD
installed,
the following is the data:
MALLOC_SIZE = 1024*1024*400
has bzero
Red Linux 6.2(kernel 2.2.14)
5.09user 5.62system 1:15.33elapsed 14%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (115298major+206560minor)pagefaults 161471swaps
4.70user 5.73system 1:17.13elapsed 13%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (116402major+206554minor)pagefaults 160731swaps
4.88user 5.68system 1:17.04elapsed 13%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (117309major+206550minor)pagefaults 161273swaps
FreeBSD 4.5-STABLE
5.489u 6.815s 1:25.96 14.2% 4+425738k 0+0io 12937pf+0w
5.342u 6.728s 1:24.40 14.2% 4+414152k 0+0io 12929pf+0w
5.073u 6.815s 1:28.58 13.4% 3+408011k 1+0io 12920pf+0w
-------
MALLOC_SIZE = 1024*1024*400
no bzero
Red Linux 6.2(kernel 2.2.14)
2.01user 4.16system 0:24.79elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (5127major+103353minor)pagefaults 59369swaps
1.82user 4.31system 0:24.90elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (4897major+103339minor)pagefaults 59250swaps
1.76user 4.29system 0:24.51elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (5814major+103343minor)pagefaults 59360swaps
FreeBSD 4.5-STABLE
2.802u 3.604s 0:23.20 27.5% 4+415497k 0+0io 81pf+0w
2.975u 3.434s 0:23.58 27.1% 4+412937k 0+0io 83pf+0w
2.871u 3.480s 0:23.91 26.5% 4+413607k 0+0io 83pf+0w
/*
* vmstress.c
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define MALLOC_SIZE 1024*1024*400
int main(int argc, char **argv) {
char *ptr;
int i, i_count;
int j;
ptr = (char *) malloc(MALLOC_SIZE);
bzero(ptr, MALLOC_SIZE);
i_count = MALLOC_SIZE / 16;
fprintf(stderr, "*");
for (i = 0; i < i_count; i ++) {
ptr[i >> 4] = ptr[(i >> 3) + 1]++;
}
fprintf(stderr, "#");
for (j = 0; j < i_count; j ++) {
ptr[j << 4] = ptr[(j >> 3) + 1]++;
}
free(ptr);
return 0;
}
Unfortunately, I havn't Linux kernel 2.4.17 installed, is Linux kernel 2.4.17 faster?
--
David Xu
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