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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: Apache + mod_php performance
Date: Thu, 26 Sep 2024 00:20:23 -0000 (UTC)
Organization: A noiseless patient Spider
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On Wed, 25 Sep 2024 19:14:58 -0400, Arne Vajhøj wrote:

> Based on some messages in error_log it looks like it uses mailboxes
> APACHE$AWS_CONTROL_MBX_nn.
> 
> If every request result in mailbox comm between master process and a
> child process, then that could slow down things.

I also wonder about the difference in handling nondeterministic 
communication.

On *nix systems, you have poll/select (also other options like epoll or 
kqueue, depending on the *nix variant) for monitoring multiple 
communication channels at once, and all your files/pipes/sockets are 
treated as byte streams.

On VMS, you have to have async QIO calls pending on every channel that you 
want to monitor, and all the communication channels are treated as record-
oriented.