[Bug c++/14563] octave built under Cygwin very slow

[paulthomas2 at wanadoo dot fr]

------- Additional Comments From paulthomas2 at wanadoo dot fr  2004-03-28 21:18 -------
Subject: Re: [Fwd:  octave built under Cygwin very slow]

Well, we seem to have got rid of the smoked fish (sorry, red herring) 
and now have a smoking howitzer......

Paul,

It strikes me that not only is new/delete slow for cygwin331 but that 
malloc/delete must also take most of the execution time for the octave 
tests.  These seem to be totally excluded from the profiling.

I have added the Intel, Visual C and gcc331 times for Windows XP on an 
Athlon 1700

Paul T

PS I would have added the exit but I was going to bash ctrl-c is 
anything went wrong with the allocation.

Paul Kienzle wrote:

> Tests of malloc and new [] for cygwin and mingw 3.2 and 3.3 and linux 
> gcc 3.3.
> Someone please fill in numbers for 'native' windows compilers, such as
> visual C and Intel.
>
> === Times, running under msys on a Windows 2000 PII-300 system
>
> System        real        user        sys
> mingw333    17.936    0.030    0.040
> cygwin331    72.394    0.020    0.060
> Cmingw333    12.277    0.010    0.060
> Ccygwin331    24.355    0.030    0.050
>
> System        real        user        sys
> mingw323    18.837    0.020    0.040
> mingw32        14.160    0.010    0.060
> cygwin32        15.933    0.020    0.050
> Cmingw32    12.668    0.030    0.040
> Ccygwin32    14.410    0.010    0.080

Paul Thomas adds...

   === Elapsed times running under Windows XP on an Athlon 1700

  System              execution time (octave> 
tic;system('./malloctest.exe');toc
  intel                   2.19
  VC                    2.17
  cygwin331        19.86
  Cintel                2.58
  CVC                 2.37
  Ccygwin331     4.34   
 

>
> === Times, running under bash on a Debian PII-400 system
>
> System        real        user        sys
> linux332         4.808    4.800    0.010
> Clinux332     3.162    3.160    0.000
>
> === Versions
>
> mingw32        3.2 (mingw special 20020817-1)
> mingw323    3.2.3 (mingw special 20030504-1)
> mingw333    3.3.3 (mingw special)
> cygwin32        3.2 (20020927 prerelease), linked against stdc++.dll
> cygwin331    3.3.1-3 (cygming special)
> linux332        3.3.2 20030908 (Debian prerelease)
>
> === C++ Compiled with g++ -O2.  Run under msys.
> // Author Paul Thomas
> #include <iostream>
> using namespace std;
>
> int main()
> {
>   for (int iloop = 0; iloop < 10000000; iloop++)
>   {
>     double *myarray;
>     if ((myarray = new double [1]) == NULL)
>         cout << "unable to allocate my array at iloop=" << iloop << endl;
>     delete [] myarray;
>   }
>   cout << "done looping" << endl;
>   return 0;
> }
>
> === C Compiled with gcc -O2.  Run under msys.
> /* modified from C++ by Paul Kienzle */
> #include <stdio.h>
> int main()
> {
>   int iloop;
>   for (iloop = 0; iloop < 10000000; iloop++)
>   {
>     double *myarray = (double *)malloc(sizeof(double));
>     if (myarray== NULL) { printf("alloc failed\n"); exit(1); }
>     else free (myarray);
>   }
>   return 0;
> }
>
>




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563