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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: Apache + mod_php performance
Date: Fri, 27 Sep 2024 02:36:18 -0000 (UTC)
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On Thu, 26 Sep 2024 22:17:29 -0400, Arne Vajhøj wrote:

> On 9/26/2024 9:26 PM, Lawrence D'Oliveiro wrote:
>
>> That and the need for all the ASTs.
> 
> Why should AST's be a problem?
> 
> The "call this function when task is done" approach is a very common
> design today. DEC was ahead of time with that.

Set attention AST → wait for AST to trigger → queue actual I/O → wait for 
AST to signal completion. Too many system calls and transitions back and 
forth between user and kernel modes.

Note that Linux servers can efficiently handle thousands of concurrent 
client connections without this.