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

reply "W³odzimierz 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:
"W³odzimierz 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


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.
Feb 27 2003
parent reply "W³odzimierz 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.

"W³odzimierz Skiba" <abx abx.art.pl> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ:
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


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
parent "W³odzimierz 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:
"W³odzimierz 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


improve

 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 "W³odzimierz Skiba" <abx abx.art.pl> writes:
"Walter" <walter digitalmars.com> wrote in
news:b3o8c1$98$4 digitaldaemon.com: 

 "W³odzimierz 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:
"W³odzimierz 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