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List:       openais
Subject:    RE: [Openais] Hot nodes and timeout option in config file
From:       Steven Dake <sdake () mvista ! com>
Date:       2005-05-26 22:19:19
Message-ID: 1117145959.16557.17.camel () persist ! az ! mvista ! com
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Muni

this is defect 577
http://www.osdl.org/developer_bugzilla/post_bug.cgi

On Fri, 2005-05-13 at 06:38, Muni Bajpai wrote:
> I think the general consensus about this topic earlier was that as
> long as the cluster size was greater than 1 the cpu ussage is decent
> as mark noticed (30% idle), the thing to note is that even with very
> HIGH traffic the usage only goes up to 40-50% total. 
> 
> There is no scheduling issue as we are single threaded.
> 
> The ISSUE is single nodes running HOT. That has to be fixed and I
> think steve already has some ideas that are sitting on his disk
> somewhere.
> 
> Thanks
> 
> Muni
> 
>  
> 
> 
> -----Original Message-----
> From: openais-bounces@lists.osdl.org
> [mailto:openais-bounces@lists.osdl.org] On Behalf Of Mark Haverkamp
> Sent: Thursday, May 12, 2005 6:01 PM
> To: Howlett, Liam [CAR:3P40:EXCH]
> Cc: Openais List
> Subject: Re: [Openais] Hot nodes and timeout option in config file
> 
> 
> On Thu, 2005-05-12 at 18:32 -0400, Liam Howlett wrote:
> > Hey,
> > 
> > Thanks for the quick reply, but I need to clarify what I was saying
> > about key and values. 
> > > > does anyone have
> > > > a list of valid keys and what are reasonable values for these
> > keys?
> > >  
> > > You just make you own key with the keygen program from the exec
> > > directory.  Here is an excerpt from the quickstart guide: 
> > I meant key=value in the /etc/ais/openais.conf file under timeout.
> > There are probably better names for this, I was in a hash way of 
> > thinking when I said that.  But seen as this will not solve my
> > problem, 
> > that's fine.  I guess I'll have to pull down a nightly build to have
> > a 
> > look.
> > 
> > What is the usual usage you see when running openais?  I seem to get
> > about 10-16% cpu on the 2.4GHz dual HT boxes when there are only two
> > nodes in the group (10-16% out of a total of 400% on all
> > processors).  
> > Perhaps a newer kernel would lower this with a better scheduler
> > though.  
> > Not sure if rhel supports the newer scheduler, doesn't really give
> > much 
> > info on the features list on the site.  I could probably update a
> few
> > of 
> > my boxes to see.  Some of my co-workers say they experienced it
> going
> > up 
> > if you leave it soak for a while.  I'm going to leave it running
> > tonight 
> > and see where I stand in the morning.
> 
> I copied the openais list so others could comment about their cpu
> usage if they want to.
> 
> I have systems with 867 Mhz processors and I see 30% or so usage of a
> processor with aisexec sitting idle.  It doesn't seem to go up a lot
> when actively sending and receiving events for instance.  I'm using
> 2.6.12-rc2 and have 4 nodes with 2 processors in each node.
> 
> Mark.
> 
> 
> > 
> -- 
> Mark Haverkamp <markh@osdl.org>
> 
> 
> 
> ______________________________________________________________________
> _______________________________________________
> Openais mailing list
> Openais@lists.osdl.org
> http://lists.osdl.org/mailman/listinfo/openais



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