Re: Clusterwide pids

["Bill Todd" <billtodd@foo.mv.com>]

----- Original Message -----
From: "J . A . Magallon" <jamagallon@able.es>
To: <irbis@orcero.org>
Cc: "Greg Freemyer" <freemyer@NorcrossGroup.com>; "Bruce Walker"
<bruce@kahuna.cag.cpqcorp.net>; <linux-cluster@nl.linux.org>
Sent: Tuesday, July 10, 2001 6:29 PM
Subject: Re: Clusterwide pids

...


> I have read sometimes about 32bit pids in lkml. I think the first thing to
do is
> ask lkml (well, really Linus) what are the plans for 32bit pids on main
kernel
> stream. Perhaps it is a 2.5 planned feature.

Not being at all Linux-savvy, I'll just mention that if the PID size may be
changing anyway taking it all the way to 64 bits might avoid another change
later.  It would allow fairly arbitrary internal formats (including support
for a node to be a member of multiple clusters, should that prove useful,
plus enough space to use just about any node-local PID as the basis for a
cluster-wide PID) with larger-than-16-bit ranges.  If I were a fan of UUIDs
for such things I might even suggest 128 bits, but I tend to prefer
physically-based identifiers where there's no compelling reason to require a
level of look-up indirection.

- bill




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