Re: [Help-gsl] Speed problem

Re: [Help-gsl] Speed problem

[Jochen Küpper]

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Paolo Zavarise <physics@paolo.zavarise.name> writes:

> GSL 1.6 compiled by myself is five/ten time slower than GSL included in 
> ubuntu (1.5.90, same one I think). I've compiled with configure/make, no 
> options, and installed in a non-default dir.

Did you compile with optimizations? If not, try setting CFLAGS, i.e. 
,----
| export CFLAGS="-g -O2 -pipe -Wall"
`----
Best would be to look at the GCC manual...

Greetings,
Jochen
-- 
Einigkeit und Recht und Freiheit                http://www.Jochen-Kuepper.de
    Liberté, Égalité, Fraternité                GnuPG key: CC1B0B4D
        (Part 3 you find in my messages before fall 2003.)

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Re: [Help-gsl] Speed problem

[Dirk Eddelbuettel]

On 25 May 2005 at 23:09, Jochen Küpper wrote:
| Paolo Zavarise <physics@paolo.zavarise.name> writes:
| 
| > GSL 1.6 compiled by myself is five/ten time slower than GSL included in 
| > ubuntu (1.5.90, same one I think). I've compiled with configure/make, no 
| > options, and installed in a non-default dir.

Is that a recompiled Ubuntu version, or the "straight" Debian package I
maintain?  In that case, the flags we use are 

DEB_BUILD_GNU_TYPE = $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
DEB_HOST_GNU_TYPE = $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
ifneq ($(DEB_BUILD_GNU_TYPE),$(DEB_HOST_GNU_TYPE))
CONFARGS = --host=$(DEB_HOST_GNU_TYPE)
endif
[...]
compilerflags	= "-O2 -D_REENTRANT"
[...]
	./configure 	--prefix=/usr 		\
			--enable-shared 	\
			--enable-static 	\
			--with-gnu-ld 		\
			$(CONFARGS)
[...]
	$(MAKE)		CFLAGS=$(compilerflags)			

i.e. it is basically just doing a regular -O2. (-D_REENTRANT is mandated by
Debian Policy as it should make multi-threaded apps behave better, as I
recall, as has no performance implications.)

| Did you compile with optimizations? If not, try setting CFLAGS, i.e. 
| ,----
| | export CFLAGS="-g -O2 -pipe -Wall"
| `----
| Best would be to look at the GCC manual...

Also, what are you using as the benchmark, and how are you comparing this?
On a dual-boot system where you may have Atlas under Ubuntu but not on the
second system? Just a thought.

Dirk

-- 
Statistics: The (futile) attempt to offer certainty about uncertainty.
         -- Roger Koenker, 'Dictionary of Received Ideas of Statistics'

Re: [Help-gsl] Speed problem

[C J Kenneth Tan -- OptimaNumerics]

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Paolo,

What are the operations/functions/routines that you are using?  How
are you measuring performance?  Which platform is this?  


Kenneth Tan
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On 2005-05-25 23:09 +0200 Jochen Küpper (jochen@fhi-berlin.mpg.de) wrote:

> Date: Wed, 25 May 2005 23:09:27 +0200
> From: "[iso-8859-1] Jochen Küpper" <jochen@fhi-berlin.mpg.de>
> To: gsl-discuss@sources.redhat.com
> Subject: Re: [Help-gsl] Speed problem
> 
> Paolo Zavarise <physics@paolo.zavarise.name> writes:
> 
> > GSL 1.6 compiled by myself is five/ten time slower than GSL included in 
> > ubuntu (1.5.90, same one I think). I've compiled with configure/make, no 
> > options, and installed in a non-default dir.
> 
> Did you compile with optimizations? If not, try setting CFLAGS, i.e. 
> ,----
> | export CFLAGS="-g -O2 -pipe -Wall"
> `----
> Best would be to look at the GCC manual...
> 
> Greetings,
> Jochen
> -- 
> Einigkeit und Recht und Freiheit                http://www.Jochen-Kuepper.de
>     Liberté, Égalité, Fraternité                GnuPG key: CC1B0B4D
>         (Part 3 you find in my messages before fall 2003.)
>