Are forks needed for this, or could you be making your API requests using a non-blocking user agent?

Forks have their own overhead, and when you make an HTTP request against an API, most of your time is spent just sitting around waiting for the response -- you're not CPU bound. If this describes your situation, have a look at Mojo::UserAgent, Mojo::IOLoop, and Mojo::Promise. There are other options: AnyEvent::UserAgent, for example, but Mojo::UserAgent makes such tidy work of the problem, it's a really nice option.

Of course I don't know what type of API you're hitting. Hopefully this suggestion is useful in your case. Example:

my @promises = map {$ua->get_p($_)} @api_points;

Mojo::Promise->all(@promises)->then(sub {
    my (@results) = @_;

    print Dumper $_->[0]->{'result'}->json
        foreach @results;
});

[download]

If you have six @api_points this will make six GET requests in rapid fire and then process the results when they all return. There's a little code that I didn't show that surrounds this; using Mojo::UserAgent, getting a $ua object, kicking off the event loop if it hasn't started, that sort of thing. But it's all documented in the links above.


Dave

In reply to Re: Parallel::ForkManager right approach by davido
in thread Parallel::ForkManager right approach by Takamoto

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