mailbox size

[Pierluigi Di Cerbo]

Hi,

there is a way to retrieve the number of elements within a mailbox of an actor at a certain moment?

Or, as alternative, there is a way to know if the size of a mailbox exceeds a given number?

 

Thank you in advance,

Cheers

Pierluigi

 

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[Dominik Charousset]

there is a way to retrieve the number of elements within a mailbox of an actor at a certain moment?

Yes: self->mailbox().size().

    Dominik

[Pierluigi Di Cerbo]

Thank you Dominik!

I wasn’t able to find it neither in the User Manual nor in the API documentation..

 

However, we still have a couple of question about the computational complexity of this function call.

We are building a real time application that may be required to process large amount of data.

So we would use the mailbox size to monitor if a specific actor is going to accumulate too much work (i.e. its mailbox size increases).

In a high throughput scenario, can the computation of the mailbox size lead to a significant performance worsening?

 

Actually we are interested to just know if the mailbox size exceedes a specific threshold.

In the version 0.15.7, in the single_reader_queue there was a count function that had a similar behaviour.

In the last version there is a similar functionality?

 

Thank you in advance,

Pierluigi

 

Da: actor-f...@googlegroups.com <actor-f...@googlegroups.com> Per conto di Dominik Charousset
Inviato: giovedì 5 settembre 2019 11:24
A: actor-f...@googlegroups.com
Oggetto: Re: [caf] mailbox size

 

there is a way to retrieve the number of elements within a mailbox of an actor at a certain moment?

 

Yes: self->mailbox().size().

 

    Dominik

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[Dominik Charousset]

> However, we still have a couple of question about the computational complexity of this function call.
> We are building a real time application that may be required to process large amount of data.
> So we would use the mailbox size to monitor if a specific actor is going to accumulate too much work (i.e. its mailbox size increases).
> In a high throughput scenario, can the computation of the mailbox size lead to a significant performance worsening?
>
> Actually we are interested to just know if the mailbox size exceedes a specific threshold.
> In the version 0.15.7, in the single_reader_queue there was a count function that had a similar behaviour.
> In the last version there is a similar functionality?

The old count() function had complexity O(n). That’s why there was the option to not count past a threshold. However, the new mailbox implementation has a counter and mailbox().size() no longer has to iterate the mailbox for counting.