llvm dev - Mar 2011 - [LLVMdev] Parallelization

Hi All,

   I am new to LLVM. So please help me out. Here is what I am trying to
achieve:

      If there are 2 statements in a source program -
         S1;
         S2;

      and I know these is no data and control dependency between them and
both take large amount of time to execute. So I want to execute them
in parallel.

      So as S1 starts executing, I want to launch another thread and
execute S2 in parallel.

  I need help on how to launch a new thread and schedule some specific
code on this new thread. I searched for it but did not get satisfiable
results. Please help me out LLVM Developers.

Regards,
Gokul Ramaswamy H.C

Hi Gokul Ramaswamy,
>     I am new to LLVM. So please help me out. Here is what I am trying to
> achieve:
>
>        If there are 2 statements in a source program -
>           S1;
>           S2;
>
>        and I know these is no data and control dependency between them and
> both take large amount of time to execute. So I want to execute them
> in parallel.
>
>        So as S1 starts executing, I want to launch another thread and
> execute S2 in parallel.
>
>    I need help on how to launch a new thread and schedule some specific
> code on this new thread. I searched for it but did not get satisfiable
> results. Please help me out LLVM Developers.
llvm-gcc and dragonegg support GOMP (gnu open-mp).  The way it works is that the
front-end lowers parallel constructs into library calls, extra functions and so
on.

Ciao, Duncan.
>
> Regards,
> Gokul Ramaswamy H.C
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Hi Duncan Sands,

    As I have understood, GOMP and OpenMP provides support for parallelizing
program at source program level. But I am at the IR level. That is I am
trying to parallelize the IR code. This is the case of automatic
parallelization. The programmer writing the code does not have any idea of
parallelization going behind the hood.

So my question is instead of support at the source program level, is the an
support at the LLVM IR level to parallelize things ??


Regards,
Gokul Ramaswamy H.C


On Tue, Mar 22, 2011 at 10:08 PM, Duncan Sands <baldrick at free.fr>
wrote:
> Hi Gokul Ramaswamy,
>
> >     I am new to LLVM. So please help me out. Here is what I am trying
to
> > achieve:
> >
> >        If there are 2 statements in a source program -
> >           S1;
> >           S2;
> >
> >        and I know these is no data and control dependency between them
> and
> > both take large amount of time to execute. So I want to execute them
> > in parallel.
> >
> >        So as S1 starts executing, I want to launch another thread and
> > execute S2 in parallel.
> >
> >    I need help on how to launch a new thread and schedule some
specific
> > code on this new thread. I searched for it but did not get satisfiable
> > results. Please help me out LLVM Developers.
>
> llvm-gcc and dragonegg support GOMP (gnu open-mp).  The way it works is
> that the
> front-end lowers parallel constructs into library calls, extra functions
> and so
> on.
>
> Ciao, Duncan.
>
> >
> > Regards,
> > Gokul Ramaswamy H.C
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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