Charm++ parallel programming system

[Nicolas Bock <nicolasbock AT gmail.com>]

Hi Jonathan,

From the examples in the manual it appears that the syntax of the when construct is

when method() [, method2() [...]] [serial] { ...C code... }

what is the difference between constructs that include the serial keyword and ones that don't? Isn't the suspension you mention around the when statement, and hence before the { ...C code... } block?

nick

On Tue, Jun 25, 2013 at 8:15 PM, Jonathan Lifflander <jliffl2 AT illinois.edu> wrote:

Sorry about the belated response.

An SDAG serial block only indicated that the block is C++ code. It has
no relation to threaded entry methods. The point in the manual means
that serial only indicated the block on code will execute without
preemption. Note that an SDAG entry method is different than an
ordinary entry method, so it can be suspended at a "when" while
Charm++ is waiting for incoming data.

If you need more explanation let me know.

Thanks,

Jonathan

On Wed, Jun 19, 2013 at 10:38 AM, Nicolas Bock <nicolasbock AT gmail.com> wrote:
> Hi,
>
> are SDAG serial blocks only necessary for threaded entry methods?
>
> Since "ordinary entry methods are completely non-preemptive" (p. 8, Charm++
> Manual), I don't otherwise understand the statement: "atomic code [...]
> without returning control to the Charm++ runtime scheduler" (p. 28, Charm++
> Manual).
>
> Thanks already,
>
> nick
>
>

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