Re: Please help me test this glibc patch

[Samuel Thibault]

Justus Winter, le Tue 09 Dec 2014 18:06:17 +0100, a écrit :
> teythoon@darnassus:~/build/time-memcpy$ bash driver.bash
>    size iterations      gcc_memcpy      memcpy          vm_copy
>    4096   16777216      6.09            6.07            15.67
>    8192    8388608      7.02            6.29            7.87
>   12288    5592405      5.19            5.29            5.22
>   16384    4194304      6.36            5.71            3.56
>   32768    2097152      7.03            7.03            2.03
>   65536    1048576      7.29            7.33            0.87

My native laptop:

   size iterations      gcc_memcpy      memcpy          vm_copy
   4096    8388608      8.69            8.69            18.83           
   8192    4194304      8.52            8.52            9.39            
  12288    2796202      8.58            8.58            6.29            
  16384    2097152      8.79            8.80            4.66            
  32768    1048576      10.74           10.74           2.38            
  65536     524288      10.72           10.73           1.23

My laptop in kvm virtualization:
   size iterations      gcc_memcpy      memcpy          vm_copy
   4096    8388608      5.97            5.92            15.16           
   8192    4194304      5.78            5.78            7.65            
  12288    2796202      5.98            5.86            4.88            
  16384    2097152      5.96            5.96            3.69            
  32768    1048576      7.32            7.30            1.85            
  65536     524288      7.34            7.29            0.96

Yes, that's really the results, I guess mach is missing some cache
configuration or some such.

Samuel