[Info-vax] Apache + mod_php performance

[Arne Vajhøj]

On 10/2/2024 7:50 PM, Lawrence D'Oliveiro wrote:
> On Wed, 2 Oct 2024 19:05:31 -0400, Arne Vajhøj wrote:
>> The descriptor being moved is a kernel close thing on *nix, so for a
>> kernel reassigning is work but not crazy much work.
>>
>> VMS is totally different. Especially for a file.
>> A file descriptor is pointing to some user mode C RTL data structures
>> that reference some RMS user mode data structures that reference some
>> RMS executive mode data structures that reference some VMS kernel mode
>> data structures.
> 
> If you leave RMS out of it, at the basic QIO level you have a channel,
> which is an index into the CCB array, which is in per-process P1 space (or
> whatever the 64-bit equivalent is). That in turn contains a reference to a
> WCB in system space, which is how VMS kept track of an open file --
> presumably there is some analogous structure for a comms socket etc.
> 
> So sharing those in-kernel structures is not the hard part -- it would be
> easy enough to allocate a channel in the CCB array in another process and
> have it point back to the same in-kernel structures.

It would be a lot easier without the C RTL data structures and the
RMS data structures.

But they exist.

Arne