Ruby 2.0 Fiber stack size is adjustable!

[Tony Arcieri]

Hey there Celluloids,

I know lots of people have had trouble with the meager 4kB stack sizes that Fibers afford. One solution is to use TaskThreads instead of TaskFibers now that they're (mostly) stable.

There's another option on Ruby 2.0: you can actually adjust the fiber stack size at the time the VM is booted. Unfortunately it's not particularly well documented:

https://github.com/ruby/ruby/blob/ruby_2_0_0/vm.c#L1702

Thanks to Schmurfy for pointing this out. We'll try to get this info into the Celluloid Wiki!

--
Tony Arcieri

[AJ Christensen]

Yay! I'll have to test this. I was running some stack-heavy code
yesterday that was plagued with this, and changing to a TaskThread
skill kind of feels like a hack.

Cheers,

AJ

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[Ben Langfeld]

fbernier highlighted this on IRC a couple'a days ago: http://irclogger.com/.celluloid/2013-05-14#1368553166

Regards,
Ben Langfeld

[Julien Ammous]

Thats' something which should have been mentioned in the changelog but was not :/

There are two set of environment variables "MACHINE" and "VM", after some researches it seems they are both the same but some

oses use the first while others use the last one.

[Ben Langfeld]

It was listed in both the changelog (https://github.com/ruby/ruby/blob/ruby_2_0_0/ChangeLog#L4122) and NEWS (https://github.com/ruby/ruby/blob/ruby_2_0_0/NEWS#L168). I'm afraid in this instance, it was only us at fault for not seeing it.

Regards,
Ben Langfeld

--

[Ben Langfeld]

I've updated the wiki page here: https://github.com/celluloid/celluloid/wiki/Fiber-Stack-Errors#mri-you-are-exceeding-the-stack-depth-available-inside-a-fiber

Regards,
Ben Langfeld

[Tim Carey-Smith]

On May 16, 2013, at 4:32 PM, Tony Arcieri <tony.a...@gmail.com> wrote:

> Hey there Celluloids,
>
> I know lots of people have had trouble with the meager 4kB stack sizes that
> Fibers afford. One solution is to use TaskThreads instead of TaskFibers now
> that they're (mostly) stable.

There are still some issues with TaskThread with celluloid-io.
I have not been able to track them down or really reproduce.

I'd be interested in anyone who has a large-ish use of celluloid-io or reel to try TaskThread and report any issues they have.

If this is something you'd like to help with, ping me at @Cellubeard on twitter. :P

Ciao,
Tim

P.S. Or @halorgium :)

> There's another option on Ruby 2.0: you can actually adjust the fiber stack
> size at the time the VM is booted. Unfortunately it's not particularly well
> documented:
>
> https://github.com/ruby/ruby/blob/ruby_2_0_0/vm.c#L1702
>
> Thanks to Schmurfy for pointing this out. We'll try to get this info into
> the Celluloid Wiki!
>
> --
> Tony Arcieri
>

[Schmurfy]

When I said changelog I was thinking about the short version, that's an area we can surely widely disagree on but while I like DTrace support this is a far more obscure additions to most people than the fact that they greatly increased the default fiber stack size and even add a way to let us configure that and yet DTrace was on the release news ;)

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