Charm++ parallel programming system

[Abhinav S Bhatele <bhatele AT illinoisalumni.org>]

We have a paper on CkDirect which you can read for more information:

http://charm.cs.illinois.edu/papers/08-11

You can also find some examples in the charm distribution at:

examples/charm++/ckdirect

- Abhinav

On Tue, Jun 21, 2011 at 9:31 PM, SAGAR SHEDGE <sagar.shedge92 AT gmail.com> wrote:

Hi,

Thank you for your reply.

I used both parameter marshalling and message passing and I also observed that there is no such difference in execution time in both code. It requires relatively same time.

So that I was thinking about using CkDirect but I never tried it. I will try for it also.

But I want ask that :

1. what is difference between message passing and using CkDirect?
2. How it works?
3. How it will help me to reduce communication time over computation in both cases?

If you have small example of CkDirect then please forward.

Thank you once again and I enjoy CHARM++.

On Tue, Jun 21, 2011 at 9:47 PM, Aaron Becker <abecker3 AT illinois.edu> wrote:

I would recommend starting with parameter marshalling, because it is
the simplest technique and it works well in most scenarios. If
marshalling and unmarshalling turn out to be a significant bottleneck
in your application you could then consider other techniques that are
potentially faster. There may be a slight overhead for parameter
marshalling vs direct message passing, but in most cases it is not
significant. The potential gains from using CkDirect are much better,
assuming your application can make use of it, but the effort and
complexity involved are also higher.

Regards,
Aaron

On Tue, Jun 21, 2011 at 1:23 AM, SAGAR SHEDGE <sagar.shedge92 AT gmail.com> wrote:
> Hi ,
>
> I am trying to send an array of objects to remote array element. In remote
> method it will read this array and will perform calculation.
>
> So I want to know that in which format should I send data to entry method
> i.e. using
>
> 1. parameter marshalling.
> 2. Message passing.
> 3. Ck-Direct.
>
> Which technique should I use and why?
> Will it affect total time required for execution?
>
> Thank you in advance for your response.
>
> --
> Sagar Dilip Shedge.
>
> C-DAC R&D,
> Pune.
>
> With Regards.
>
>

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>

--
Sagar Dilip Shedge.

C-DAC R&D,
Pune.

With Regards.

 

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