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Re: Revisited: Hurd on a cluster computer

From: Mark Morgan Lloyd
Subject: Re: Revisited: Hurd on a cluster computer
Date: Sun, 21 May 2017 14:14:46 +0000
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On 21/05/17 13:45, Justus Winter wrote:
Samuel Thibault <samuel.thibault@gnu.org> writes:

Though there was some work, a reimplementation if memory serves, of the
netmsg servers.  The archive should have some infos on that.

Yes, by Brent who was the instigator of the original thread that I was belatedly commenting to :-)

Well, that's unrelated to the question above, which was actually
unrelated to the original thread, which you are answering now :)

Ah, segmentation... Indeed, I wasn't reading that carefully, I thought
is was related to the in-kernel forwarding of Mach messages across

Which is of course an interesting question in itself, and one which entirely by chance a hardware engineer of my acquaintance has been casually pondering.

Incidentally, I've also just remembered http://www.scalemp.com/products/product-comparison/ which is another interesting attempt to build a cluster on top of Linux.

Finally, I'm not entirely sure where IBM mainframe operating systems stand on the "SSI or not SSI" question: they have, of course, been doing this sort of thing for decades. My understanding is that a single computer (i.e. one "frame") is basically SMP with SSI, but that a sysplex has multiple OS instances with jobs moved around as required. It's perhaps interesting that Moshe Bar, who was originally responsible for MOSIX, is occasionally seen hanging out in IBM mainframe mailing lists.

CC not necessary, I'm subscribed.

Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

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