Re: Comparative Performance of C++ Compilers (including gcc cygming special)

["Alex Vinokur" <alexvn at connect dot to>]

"chris" wrote in message 407C0198.4000707@cs.york.ac.uk">news:407C0198.4000707@cs.york.ac.uk...
> Alex Vinokur wrote:
>
> >        ========================================
> >        Comparative Performance of C++ Compilers
> >        C/C++ Performance Tests
> >        =========================================
> >
> >
> >
> <snip>
>
> While this is quite interesting, it seems to me you aren't really
> running these programs for long enough for us to be able to see what
> differences are due to startup time and due to runtime.

How can we know how long the startup time is?

> How about a couple of extra jobs, one of which runs for 1 minute and one for 2?
>
>
>

Three extra jobs for copyfile.cpp, g++ (Mingw32 Interface), No optimization.
* job-1 : 1 min 10 sec
* job-2 : 2 min 28 sec
* job-2 : 5 min 57 sec



$ g++ -mno-cygwin copyfile.cpp

$ command time -p a 1000 50 750 1 > out 2>&1  // job-1

$ cat out

=======================================
Simple C/C++ Perfometer : Copying files
Version CF-1.1
=======================================


---------------------
GNU gcc 3.3.1 (MINGW)
---------------------

 YOUR COMMAND LINE : a.exe 1000 50 750 1

 ### File size             : 1000
 ### Number of runs        : 1
 ### Number of tests       : 50
 ### Number of repetitions : 750
 ### CLOCKS_PER_SEC        : 1000



   Run-1 of 1 : Started ..................................................
c_1__functions_getc_putc                 :     45 units (0.045 secs)
c_2__functions_fgetc_fputc               :    175 units (0.175 secs)
c_3__functions_fread_fwrite              :     22 units (0.022 secs)
cpp_1__operators_in_out                  :    434 units (0.434 secs)
cpp_2__methods_get_put                   :    235 units (0.235 secs)
cpp_3__methods_sbumpc_sputc              :     89 units (0.089 secs)
cpp_4__method_sbumpc__op_out             :     41 units (0.041 secs)
cpp_5__method_rdbuf__op_out              :     38 units (0.038 secs)
cpp_6__methods_cpp_read_write__const_buf :     39 units (0.039 secs)
cpp_7__methods_cpp_read_write__max_buf   :     35 units (0.035 secs)
   Run-1 of 1 : Finished

real 70.24
user 0.02
sys 0.07




$ command time -p a 1000 100 750 1 > out 2>&1  // job-2

$ cat out

=======================================
Simple C/C++ Perfometer : Copying files
Version CF-1.1
=======================================


---------------------
GNU gcc 3.3.1 (MINGW)
---------------------

 YOUR COMMAND LINE : a.exe 1000 100 750 1

 ### File size             : 1000
 ### Number of runs        : 1
 ### Number of tests       : 100
 ### Number of repetitions : 750
 ### CLOCKS_PER_SEC        : 1000



   Run-1 of 1 : Started ....................................................................................................
c_1__functions_getc_putc                 :     85 units (0.085 secs)
c_2__functions_fgetc_fputc               :    324 units (0.324 secs)
c_3__functions_fread_fwrite              :     42 units (0.042 secs)
cpp_1__operators_in_out                  :    782 units (0.782 secs)
cpp_2__methods_get_put                   :    411 units (0.411 secs)
cpp_3__methods_sbumpc_sputc              :    157 units (0.157 secs)
cpp_4__method_sbumpc__op_out             :     71 units (0.071 secs)
cpp_5__method_rdbuf__op_out              :     64 units (0.064 secs)
cpp_6__methods_cpp_read_write__const_buf :     67 units (0.067 secs)
cpp_7__methods_cpp_read_write__max_buf   :     62 units (0.062 secs)
   Run-1 of 1 : Finished

real 208.71
user 0.05
sys 0.04




$ command time -p a 1000 200 750 1 > out 2>&1  // job-2

$ cat out

=======================================
Simple C/C++ Perfometer : Copying files
Version CF-1.1
=======================================


---------------------
GNU gcc 3.3.1 (MINGW)
---------------------

 YOUR COMMAND LINE : a.exe 1000 200 750 1

 ### File size             : 1000
 ### Number of runs        : 1
 ### Number of tests       : 200
 ### Number of repetitions : 750
 ### CLOCKS_PER_SEC        : 1000



   Run-1 of 1 : Started
....................................................................................................................................
....................................................................
c_1__functions_getc_putc                 :     81 units (0.081 secs)
c_2__functions_fgetc_fputc               :    307 units (0.307 secs)
c_3__functions_fread_fwrite              :     39 units (0.039 secs)
cpp_1__operators_in_out                  :    734 units (0.734 secs)
cpp_2__methods_get_put                   :    385 units (0.385 secs)
cpp_3__methods_sbumpc_sputc              :    152 units (0.152 secs)
cpp_4__method_sbumpc__op_out             :     67 units (0.067 secs)
cpp_5__method_rdbuf__op_out              :     62 units (0.062 secs)
cpp_6__methods_cpp_read_write__const_buf :     62 units (0.062 secs)
cpp_7__methods_cpp_read_write__max_buf   :     59 units (0.059 secs)
   Run-1 of 1 : Finished

real 357.10
user 0.01
sys 0.04


--
   Alex Vinokur
     mailto:alexvn@connect.to
     http://mathforum.org/library/view/10978.html






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