#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <pthread.h>
#define TIME_DIFF(ts,te) ((te.tv_sec-ts.tv_sec)+(te.tv_usec-ts.tv_usec)*1.0/1000000)
int main(int argc, char** argv){
if(argc<2){
printf("Usage: %s mem_size\n", argv[0]);
exit(0);
}
struct timeval s,e;
int i;
char buff[5120000];
int ranges[] = {1024, 10240, 102400, 1024000, 2048000, 4096000, 5120000};
int pos = 0;
int max = 5120000 * 200;
gettimeofday(&s, NULL);
for(i=100000;i<99999999;i++){
pos += sprintf(buff+pos, "%d", i);
//printf("%d\n", pos);
pos--;
if(pos+4>5120000){
//buff[5120000-1] = 0;
break;
}
}
gettimeofday(&e, NULL);
double time_use = TIME_DIFF(s,e);
int count = sizeof(ranges)/sizeof(int);
printf("Step count=%d,set up time_use=%10.6f, len=%d, pos=%d\n", count, time_use, strlen(buff), pos);
char* mem = malloc(max);
pos = 0;
for(i=0;i<count;i++){
gettimeofday(&s, NULL);
pos = 0;
int count1 = max/ranges[i];
int count2 = 0;
while(count1--){
memcpy(mem+pos, buff, ranges[i]);
count2++;
}
gettimeofday(&e, NULL);
time_use = TIME_DIFF(s,e);
count1 = count2*ranges[i];
double speed = count1/time_use/1024/1024/1024;
printf("%2d>Write block size=%8d , time_use=%10.6f, copy times=%10d, size=%d, speed %18.6f G/s\n", i, ranges[i], time_use, count2, count1,speed);
}
return 0;
}
[root@lein lein]# ./tmem 1
Step count=11,set up time_use= 0.186764, len=5119999, pos=5119998
0>Write block size= 1024 , time_use= 0.065535, copy times= 1000000, size=1024000000, speed 14.552137 G/s
1>Write block size= 10240 , time_use= 0.060471, copy times= 100000, size=1024000000, speed 15.770771 G/s
2>Write block size= 12288 , time_use= 0.060541, copy times= 83333, size=1023995904, speed 15.752474 G/s
3>Write block size= 15360 , time_use= 0.063964, copy times= 66666, size=1023989760, speed 14.909399 G/s
4>Write block size= 18432 , time_use= 0.124406, copy times= 55555, size=1023989760, speed 7.665746 G/s
5>Write block size= 20480 , time_use= 0.126707, copy times= 50000, size=1024000000, speed 7.526611 G/s
6>Write block size= 102400 , time_use= 0.116850, copy times= 10000, size=1024000000, speed 8.161526 G/s
7>Write block size= 1024000 , time_use= 0.114569, copy times= 1000, size=1024000000, speed 8.324017 G/s
8>Write block size= 2048000 , time_use= 0.158859, copy times= 500, size=1024000000, speed 6.003275 G/s
9>Write block size= 4096000 , time_use= 0.251965, copy times= 250, size=1024000000, speed 3.784948 G/s
10>Write block size= 5120000 , time_use= 0.349343, copy times= 200, size=1024000000, speed 2.729908 G/s
[root@lein lein]# ./tmem 1
Step count=11,set up time_use= 0.186145, len=5119999, pos=5119998
0>Write block size= 1024 , time_use= 0.067273, copy times= 1000000, size=1024000000, speed 14.176182 G/s
1>Write block size= 10240 , time_use= 0.060461, copy times= 100000, size=1024000000, speed 15.773380 G/s
2>Write block size= 12288 , time_use= 0.060521, copy times= 83333, size=1023995904, speed 15.757679 G/s
3>Write block size= 15360 , time_use= 0.062843, copy times= 66666, size=1023989760, speed 15.175354 G/s
4>Write block size= 18432 , time_use= 0.125159, copy times= 55555, size=1023989760, speed 7.619626 G/s
5>Write block size= 20480 , time_use= 0.126732, copy times= 50000, size=1024000000, speed 7.525126 G/s
6>Write block size= 102400 , time_use= 0.115774, copy times= 10000, size=1024000000, speed 8.237379 G/s
7>Write block size= 1024000 , time_use= 0.115338, copy times= 1000, size=1024000000, speed 8.268518 G/s
8>Write block size= 2048000 , time_use= 0.162651, copy times= 500, size=1024000000, speed 5.863317 G/s
9>Write block size= 4096000 , time_use= 0.261244, copy times= 250, size=1024000000, speed 3.650512 G/s
10>Write block size= 5120000 , time_use= 0.344416, copy times= 200, size=1024000000, speed 2.768961 G/s
[root@lein lein]# ./tmem 1
Step count=11,set up time_use= 0.186370, len=5119999, pos=5119998
0>Write block size= 1024 , time_use= 0.061831, copy times= 1000000, size=1024000000, speed 15.423886 G/s
1>Write block size= 10240 , time_use= 0.060461, copy times= 100000, size=1024000000, speed 15.773380 G/s
2>Write block size= 12288 , time_use= 0.060496, copy times= 83333, size=1023995904, speed 15.764191 G/s
3>Write block size= 15360 , time_use= 0.063776, copy times= 66666, size=1023989760, speed 14.953349 G/s
4>Write block size= 18432 , time_use= 0.118645, copy times= 55555, size=1023989760, speed 8.037969 G/s
5>Write block size= 20480 , time_use= 0.126454, copy times= 50000, size=1024000000, speed 7.541670 G/s
6>Write block size= 102400 , time_use= 0.116525, copy times= 10000, size=1024000000, speed 8.184289 G/s
7>Write block size= 1024000 , time_use= 0.116533, copy times= 1000, size=1024000000, speed 8.183727 G/s
8>Write block size= 2048000 , time_use= 0.162223, copy times= 500, size=1024000000, speed 5.878786 G/s
9>Write block size= 4096000 , time_use= 0.263963, copy times= 250, size=1024000000, speed 3.612909 G/s
10>Write block size= 5120000 , time_use= 0.348008, copy times= 200, size=1024000000, speed 2.740380 G/s