Re: multiprocessing with gnat

Re: multiprocessing with gnat

[Robert Dewar]

Gerald asks

<<How can I build a program that uses multiple processors ?
If I compile with gnatmake -O3 xxx only one is used.
I'm using gnat3.07 on sgi powerchallenge with 8 proc.>>

Check the documentation that comes with the SGI product, it has full details
on how to do multi-processing using the SGI Ada product. If you are not an
SGI customer, talk to SGI, they have a special university deal to get this
and other software with inexpensive site licenses, and since you have serious
hardware, this makes good sense. The SGI Ada product comes with a lot of
extra goodies, like bindings to all their graphics libraries, so it is 
well worth obtaining it.

Re: multiprocessing with gnat

[Peter Hermann]

Gerald.Kasner@Physik.Uni-Magdeburg.de wrote:
: How can I build a program that uses multiple processors ?
: If I compile with gnatmake -O3 xxx only one is used.
: I'm using gnat3.07 on sgi powerchallenge with 8 proc.
: - Thanks Gerald

setenv PTHREAD_SPROC_COUNT "AUTO"

;-)

--
Peter Hermann  Tel:+49-711-685-3611 Fax:3758 ph@csv.ica.uni-stuttgart.de
Pfaffenwaldring 27, 70569 Stuttgart Uni Computeranwendungen
Team Ada: "C'mon people let the world begin" (Paul McCartney)

Re: multiprocessing with gnat

[Tom Quiggle]

In article <5git7c$29ji@info4.rus.uni-stuttgart.de>, ica2ph@alpha1.csv.ica.uni-stuttgart.de writes:
> Gerald.Kasner@Physik.Uni-Magdeburg.de wrote:
> : How can I build a program that uses multiple processors ?
> : If I compile with gnatmake -O3 xxx only one is used.
> : I'm using gnat3.07 on sgi powerchallenge with 8 proc.
> : - Thanks Gerald

Are you trying to parallize the build, or the execution of the resulting
executable?  If you want to parallelize the build, use "gnatmake -jnnn"
where nnn is the number of concurrent compiles you desire (hint, try 8
on your system).  Assuming you are using the SGI Ada95 product and not
the free FTP distribution, "man gnatmake" will give you all the info you
need.

> setenv PTHREAD_SPROC_COUNT "AUTO"
> 
> ;-)
If you want to parallelize the executable, the SGI implementation will
distribute Ada tasks across multiple processors via the above mechanism.

Tom Quiggle

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