On Apr 26, 12:10 pm, n00m <[EMAIL PROTECTED]> wrote:
> Both codes below read the same huge(~35MB) text file.
> In the file > 1000000 lines, the length of each line < 99 chars.
>
> Stable result:
> Python runs ~0.65s
> C : ~0.70s
>
> Any thoughts?
>
> import time
> t=time.time()
> f=open('D:\\some.txt','r')
> z=f.readlines()
> f.close()
> print len(z)
> print time.time()-t
> m=input()
> print z[m]
>
> #include <cstdio>
> #include <cstdlib>
> #include <iostream>
> #include <ctime>
>
> using namespace std;
> char vs[1002000][99];
> FILE *fp=fopen("D:\\some.txt","r");
>
> int main() {
> int i=0;
> while (true) {
> if (!fgets(vs[i],999,fp)) break;
> ++i;
> }
> fclose(fp);
> cout << i << endl;
> cout << clock()/CLOCKS_PER_SEC << endl;
>
> int m;
> cin >> m;
> cout << vs[m];
> system("pause");
> return 0;
>
> }
>
>
First try again with pure C code and compile with a C compiler, not
with C++ code and C++ compiler.
Then, tweak the code to use more buffering, to make it more similar
to readline code, like this (not tested):
#include <stdio.h>
#include <time.h>
char vs[1002000][100];
char buffer[65536];
int main(void) {
FILE *fp;
int i, m;
clock_t begin, end;
double t;
begin = clock();
fp = fopen("cvspython.txt", "r");
i = 0;
setvbuf(fp, buffer, _IOFBF, sizeof(buffer));
while(1) {
if(!fgets(vs[i], 100, fp)) break;
++i;
}
fclose(fp);
printf("%d\n", i);
end = clock();
t = (double)(end - begin)/CLOCKS_PER_SEC;
printf("%g\n", t);
scanf("%d", &m);
printf("%s\n", vs[m]);
getchar();
return 0;
}
Finally, repeat your statement again, if necessary.
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