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c++.windows.32-bits - looking for settings

reply "W這dzimierz Skiba" <abx abx.art.pl> writes:
I'm looking for good compiler settings to made fastest win32 console 
application which heavily uses floating point operations. Currently I use:
  CFLAGS= -o -v0 -cpp -mn -6 -ff -WA -I$(CPATH) -Ae
but I'm not sure they are best. I have this application compiled with 5 
free-like compilers and DMC++ version is slowest :-( Does linker settings 
influence speed much ? If so what can be improved in
  LFLAGS= /B /N /NOL /P:32

I know I can use profiling for optimizing code but this would influence all 
compilations. I first want to get best settings specific for DMC++.

Thanks in advance, ABX
Feb 27 2003
parent reply "Walter" <walter digitalmars.com> writes:
"W這dzimierz Skiba" <abx abx.art.pl> wrote in message
news:b3ldsp$1dn9$1 digitaldaemon.com...
 I'm looking for good compiler settings to made fastest win32 console
 application which heavily uses floating point operations. Currently I use:
   CFLAGS= -o -v0 -cpp -mn -6 -ff -WA -I$(CPATH) -Ae
 but I'm not sure they are best. I have this application compiled with 5
 free-like compilers and DMC++ version is slowest :-( Does linker settings
 influence speed much ? If so what can be improved in
   LFLAGS= /B /N /NOL /P:32

-o -ff -6 should do the trick.
 I know I can use profiling for optimizing code but this would influence

 compilations. I first want to get best settings specific for DMC++.

If you could track down just what is slower about it, I can have a go at fixing it.
Feb 27 2003
parent reply "W這dzimierz Skiba" <abx abx.art.pl> writes:
"Walter" <walter digitalmars.com> wrote in
news:b3lo73$1k95$1 digitaldaemon.com: 
   CFLAGS= -o -v0 -cpp -mn -6 -ff -WA -I$(CPATH) -Ae

-o -ff -6 should do the trick.

This is already used.
 I know I can use profiling for optimizing code but this would
 influence  all
 compilations. I first want to get best settings specific for DMC++.

If you could track down just what is slower about it, I can have a go at fixing it.

I really would like to help making DMC++ faster in float operations but I have no idea how to extract slowest part. The application is large and complicated. First of all I would like to play with recompilation of snn.lib as suggested at http://cmeerw.org/prog/dm/rtl.html . Can it improve speed? What are the other ways I can follow to track speed differences between various compilations? The summary is available at http://news.povray.org/povray.unofficial.patches/30656/ (skip setup page). ABX
Feb 28 2003
next sibling parent reply "Nic Tiger" <nictiger progtech.ru> writes:
I think that problems could be due to -Ae switch. Code with exceptions
handling is usually slower than that without exceptions.

And what CPU you run tests on? I think DMC is much faster on Intels than on
AMDs or others.

Nic Tiger.

"W這dzimierz Skiba" <abx abx.art.pl> 衃狟楦/衃狟楦攽  恘豜衲捑 蚝鼴梏暙:
news:b3n7mn$2f6p$1 digitaldaemon.com...
 "Walter" <walter digitalmars.com> wrote in
 news:b3lo73$1k95$1 digitaldaemon.com:
   CFLAGS= -o -v0 -cpp -mn -6 -ff -WA -I$(CPATH) -Ae

-o -ff -6 should do the trick.

This is already used.
 I know I can use profiling for optimizing code but this would
 influence  all
 compilations. I first want to get best settings specific for DMC++.

If you could track down just what is slower about it, I can have a go at fixing it.

I really would like to help making DMC++ faster in float operations but I have no idea how to extract slowest part. The application is large and complicated. First of all I would like to play with recompilation of snn.lib as suggested at http://cmeerw.org/prog/dm/rtl.html . Can it

 speed? What are the other ways I can follow to track speed differences
 between various compilations? The summary is available at
 http://news.povray.org/povray.unofficial.patches/30656/
 (skip setup page).

 ABX

Feb 28 2003
parent "W這dzimierz Skiba" <abx abx.art.pl> writes:
"Nic Tiger" <nictiger progtech.ru> wrote in
news:b3npni$2obf$1 digitaldaemon.com: 

 I think that problems could be due to -Ae switch. Code with exceptions
 handling is usually slower than that without exceptions.

Are you refering to exception handling in DMC or in general? Exception was necessary due to features in code. I can't remove it from code. It is part of official binaries.
 And what CPU you run tests on? I think DMC is much faster on Intels
 than on AMDs or others.

As written at mentioned url, I used Intel Pentium II 233 MHz with NT4. ABX
Feb 28 2003
prev sibling parent reply "Walter" <walter digitalmars.com> writes:
"W這dzimierz Skiba" <abx abx.art.pl> wrote in message
news:b3n7mn$2f6p$1 digitaldaemon.com...
 I really would like to help making DMC++ faster in float operations but I
 have no idea how to extract slowest part. The application is large and
 complicated.

One way is to try the profiler, www.digitalmars.com/ctg/trace.html
 First of all I would like to play with recompilation of
 snn.lib as suggested at http://cmeerw.org/prog/dm/rtl.html . Can it

 speed?

No, I don't think that will help.
 What are the other ways I can follow to track speed differences
 between various compilations?

Are you using a high speed timer?
 The summary is available at
 http://news.povray.org/povray.unofficial.patches/30656/

Feb 28 2003
parent reply "W這dzimierz Skiba" <abx abx.art.pl> writes:
"Walter" <walter digitalmars.com> wrote in
news:b3o8c1$98$4 digitaldaemon.com: 
 "W這dzimierz Skiba" <abx abx.art.pl> wrote in message
 news:b3n7mn$2f6p$1 digitaldaemon.com...
 I really would like to help making DMC++ faster in float operations
 but I have no idea how to extract slowest part. The application is
 large and complicated.

One way is to try the profiler, www.digitalmars.com/ctg/trace.html

Ok. I have output of profiled MinGW console compilation and output of profiler used in DMC. Is there easy way to compare it or I have to explore it myself line by line ?
 What are the other ways I can follow to track speed differences
 between various compilations?

Are you using a high speed timer?

I think "yes".
 The summary is available at
 http://news.povray.org/povray.unofficial.patches/30656/


latest measurement at http://news.povray.org/ou566vgg0gqih2vvlsovillshbf09t7r4g%404ax.com ABX
Mar 05 2003
parent "Walter" <walter digitalmars.com> writes:
"W這dzimierz Skiba" <abx abx.art.pl> wrote in message
news:b44i9u$1gis$1 digitaldaemon.com...
 Ok. I have output of profiled MinGW console compilation and output of
 profiler used in DMC. Is there easy way to compare it or I have to explore
 it myself line by line ?

I think you'll have to explore it line by line.
Mar 06 2003