share a var between workers

[arjan]

If I use Starman with this code:

my $counter = 0;

my $app = sub {
my $senv = shift;
$counter++;
return [ 200, [ 'Content-Type' => 'text/html' ], [ "counter: $counter" ] ];
};

Each worker gets it's own copy of $counter. The value of $counter depends on the worker serving the request.

Would it be somehow possible to share a variable between workers?

Kind regards,
Arjan.

[Tatsuhiko Miyagawa]

use memcache or some other shared memory mechanism.

[Nuba Princigalli]

Hi Arjan,

Redis' been my "shared-memory of choice" for quite some time, might want to check it out:

* simple case http://redis.io/commands/incr

* with the counter in a hash http://redis.io/commands/hincrby

Have fun,

Nuba

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[arjan]

Hi Nuba,

Thanks, I know redis, it's really cool. 

But I'm not looking for anything database-like, I want to make a server that has a large hash of bit::vectors and serves information about that collection. Hence I need access to an instantiated variable with instantiated objects. The counter was just a simple example to demonstrate the problem with implementing this with starman. 

So I should either find out how to share it between workers, or I should find some single process solution perhaps.

Kind regards,
Arjan.

Op vrijdag 17 augustus 2012 18:49:30 UTC+2 schreef Nuba Princigalli het volgende:

[Tatsuhiko Miyagawa]

Static data can be shared by initializing them on the parent process (inside your app, with --preload-app option) and then referenced safely via the workers, but you can't update the data in the parent without using some kind of IPC mechanism. It's not just a problem with Starman it's a generic thing with forking multi processes.

--

Tatsuhiko Miyagawa

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[arjan]

Dear Tatsuhuko,

Thank you, I understand. So, I should be ok, with any non-forking solution, like Twiggy.

Kind regards,
Arjan

Op maandag 20 augustus 2012 00:56:01 UTC+2 schreef Tatsuhiko Miyagawa het volgende: