Is a Data copy made when dequeuing an element and requeueing somewhere else?

[AlexA]

Hi Guys,

 

I've started sending some really big messages around my application and I was wondering if memory is allocated at each message handler? See the following code pic for an example:

 

More generally, what are the best ways to pass around massive data blocks (100s of MB) between processes?

Cheers,

Alex

[ned]

Enqueue/Dequeue does not make a copy, so queues are a good choice here. Of course, if you enqueue data and continue to modify it at the same time, after it's already in the queue, then you'll force a copy because you'll need to have one copy in the queue and another to modify, so make sure that the wire ends at the enqueue. Preview Queue will make a copy of the data, since one copy needs to stay in the queue.

[Neville D]

You could use Data Value References when dealing with large blocks of data.  Thats what they were designed for.