Charm++ parallel programming system

[Jozsef Bakosi <jbakosi AT gmail.com>]

Hi folks,

I have classes A and B each with an entry method, e.g., in a .ci file:

chare A {

    entry [threaded] void evaluate( CkFuture f );

}

chare B {

    entry [threaded] void run( CkFuture f );

}

Then B.run(), receiving a future, calls A.evaluate() via its proxy, passing its future on, which in turn creates a message and sends it via CkSendToFuture() to some function that's waiting for it. B.run() does not create a message, only A.evaluate() does eventually.

The manual's Sec.12.2 advises that sync entry methods must be threaded (are threaded by default?), while Sec.12.3, discussing futures, declares fib::run() as threaded.

Should the entry method that calls CkSendToFuture() be declared [threaded] or only the one that forwards a future or both?

Does a [sync] method automatically assumes a [threaded] attribute as well?

Would you recommend passing a future by value or it is also okay to pass it by reference? (I assume it needs to be communicated so it shouldn't matter.)

Thanks,

Jozsef