linux-kernel - Re: [RFC][PATCH] Cross Memory Attach

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Message-ID: <20100915081653.GA16406@elte.hu>
Date:	Wed, 15 Sep 2010 10:16:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christopher Yeoh <cyeoh@....ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org
Subject: Re: [RFC][PATCH] Cross Memory Attach


> > NPB:
> > ====
> > BT - 12% improvement
> > FT - 15% improvement
> > IS - 30% improvement
> > SP - 34% improvement
> > 
> > IMB:
> > ===
> > 		
> > Ping Pong - ~30% improvement
> > Ping Ping - ~120% improvement
> > SendRecv - ~100% improvement
> > Exchange - ~150% improvement
> > Gather(v) - ~20% improvement
> > Scatter(v) - ~20% improvement
> > AlltoAll(v) - 30-50% improvement

btw., how does OpenMPI signal the target tasks that something happened 
to their address space - is there some pipe/socket side-channel, or 
perhaps purely based on flags in the modified memory areas, which are 
polled?

	Ingo
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