time command does not show CPU time for MinGW binaries. I have this
sample piece of code:
#include <stdio.h>
#include <time.h>
#define N 100000
#define K 10000
double data[N];
int main()
{
clock_t t = clock();
for (unsigned long n = 0; n < N; ++n)
for (unsigned long k = 0; k < K; ++k)
data[n] += data[n] * data[k];
t = clock() - t;
printf("Time %.3f\n", (double)t / CLOCKS_PER_SEC);
return 0;
}
When I compile it using Cygwin's gcc, time shows CPU time (user time) as
expected:
$ gcc -o test test.c -O3
$ time ./test
Time 1.890
real 0m2,043s
user 0m1,890s
sys 0m0,000s
However when code is compiled using MinGW's gcc, time reports 0.000 as a
user time. Note that clock() function still provides valid values:
$ x86_64-w64-mingw32-gcc -o test test.c -O3
$ time ./test
Time 1.889
real 0m1,998s
user 0m0,000s
sys 0m0,015s
I have updated Cygwin to latest version today.
$ uname -r
2.9.0(0.318/5/3)
gcc (GCC) 6.4.0
x86_64-w64-mingw32-gcc (GCC) 6.4.0
I am using Win10 Pro now. As I recall, it worked when I was using it
about year ago on Win7 Pro. So it is probably Win10 issue.
Is this a known bug, or should I log a new one? Do you know if there is
any workaround?
Daniel
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