Re: kcomd - was Re: OpenMOSIX process migration mechanism

"Ian Latter" <[email protected]>
Newsgroups gmane.linux.cluster.openmosix.devel
Message-ID <[email protected]> 
Thanks for the response - I've not been clear, its my fault
for not being explicit.  In both questions, I'm working from
a user-space perception;


  On "node awareness"

  Assuming that nodes have been discovered some
  other way - such as omautod - then does my question
  hold true?  That is, does kcomd provide a mechanism
  to allow oM to exclude nodes that have "disappeared",
  regardless of the autodiscovery daemon's perception?

  Alternatively, consider a static map.  Will oM drop its
  in-kernel host entries for nodes that do not 
  acknowledge kcomd messages?


  On node "message passing"

  As there is now a concept of a node-to-node 
  communication  (as opposed to a PID-to-PID-on-other-
  node communication),  I would like to know if there is
  a comms-channel that is now available for me to use
  from user space on node "a" to user space on node
  "b".  

  My current technique is via a socket, with a TCP
  channel via an IPv4 network transport.

  Currently (production oM) there are native Linux
  techniques available for message passing - such as
  named pipes - but there is nothing specific to oM to
  forward a message between two oM nodes.  
  Ultimately, I'm not expecting a message passing 
  protocol/facility to exist, as oM aims to be transparent,
  but if one is avaliable, I'd like to use it.



  Sorry for not being more specific, just running some
ideas while I program something else .. seeing where
new pieces might fit together.


Thanks,







----- Original Message -----
>From: "Niels de Vos" <[email protected]>
>To: "Ian Latter" <[email protected]>
>Subject:  Re: [Openmosix-devel] kcomd - was Re: OpenMOSIX process	
migration	mechanism
>Date: Sun, 13 Aug 2006 12:04:11 +0200
>
> Hello Ian,
> 
> <anyone please correct me if I'm wrong>
> 
> as far as I understand kcomd doesn't have a discovery functionality -
> this should be done in userspace. kcomd is used by oM to communicate
> between migrating/migrated processes. This is al running in-kernel and
> will only provide the most neccesary functions. By using this mechanism
> (see it as communication layer) oM should become more stable.
> 
> Node-to-node message passing is quite a general term... But I think the
> answer is more or less 'it depends, but kcomd sends and receives
> messages'. If a node-to-node-message and a kcomd-message are the 
same is
> not clear to me.
> 
> Cheers,
> Niels
> 
> On Sun, 2006-08-13 at 12:17 +1000, Ian Latter wrote:
> > Hello,
> > 
> > 
> >   Does kcomd monitor the availability of the neighbour?  
> > I.e. if I poll the oM Map will I know which nodes are 
> > active/up? Or just all nodes that have ever been?
> > 
> >   Also, does the existence of kcomd bring about a
> > node-to-node message passing mechanism?  Will keep 
> > using my own IP based version if there isn't  ...
> > 
> > 
> > Thanks,
> > 
> > 
> > ----- Original Message -----
> > >From: "Matt Dew" <[email protected]>
> > >To: <[email protected]>
> > >Subject:  Re: [Openmosix-devel] OpenMOSIX process migration 
> > mechanism
> > >Date: Fri, 11 Aug 2006 09:59:51 -0600
> > >
> > > (Evan, I'm assuming that was meant for Martin, not me.)
> > > 
> > > Agreed. You don't want to do this with oM.  Security implications
> > > abound.
> > > 
> > > Matt
> > > 
> > > On Fri, 2006-08-11 at 05:32 +0000, "Evan Hisey"  wrote:
> > > > Matt-
> > > >   What you are looking for sounds more like a batch scheduler than
> > > > openmosix. I think you would have better luck adapting something 
like
> > > > folding@home or SETI@home for what oyu want to do.
> > > > 
> > > > Evan
> > > > 
> > > > On 8/10/06, [email protected] <martin2@dslextreme.
com> 
> > wrote:
> > > > > If the node can be expected to run no more than one or two 
> > processes
> > > at a
> > > > > time,
> > > > > which would be the better system with less processor 
overhead?
> > > > >
> > > > > Sounds to me like 2.4. is less overhead for the nodes.
> > > > > The head node is the one that would benefit from 2.6.  Am I 
reading
> > > that
> > > > > correctly?
> > > > >
> > > > > Also, I want the owner of the node to be able to go to a website,
> > > click on
> > > > > a link
> > > > > and get connected to their choice of project to donate time to. 
> > > That
> > > > > would probably
> > > > > involve a URL such as:  "PROTOCOL://nn.nn.nn.nn#PORT" I'm 
not 
> > sure
> > > which
> > > > > protocol to use, or how to pass it to oM.  Any suggestions?
> > > > >
> > > > > > ...
> > > > > > Date: Thu, 10 Aug 2006 08:33:40 -0600
> > > > > > From: "Matt Dew" <[email protected]>
> > > > > > Subject: Re: [Openmosix-devel] OpenMOSIX process 
migration
> > > mechanism
> > > > > > ...
> > > > > > Hi Irfan,
> > > > > >   Under the covers they are quite different.  2.4 has each 
process
> > > > > > maintaining its own comm socket between deputy (home) and 
> > remote.
> > > > > >
> > > > > > 2.6 has a kernel daemon, kcomd, that manages all 
> > communications.
> > > > >
> > > > >
> > > -------------------------------------------------------------------------
> > > > > Using Tomcat but need to do more? Need to support web 
services,
> > > security?
> > > > > Get stuff done quickly with pre-integrated technology to make 
your
> > > job easier
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> > > http://sel.as-us.falkag.net/sel?
> > cmd=lnk&kid=120709&bid=263057&dat=121642
> > > > > _______________________________________________
> > > > > openMosix-devel mailing list
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> > > > > https://lists.sourceforge.net/lists/listinfo/openmosix-devel
> > > > >
> > > > 
> > > >
> > > -------------------------------------------------------------------------
> > > > Using Tomcat but need to do more? Need to support web services,
> > > security?
> > > > Get stuff done quickly with pre-integrated technology to make your 
job
> > > easier
> > > > Download IBM WebSphere Application Server v.1.0.1 based on 
Apache
> > > Geronimo
> > > >
> > > http://sel.as-us.falkag.net/sel?
> > cmd=lnk&kid=120709&bid=263057&dat=121642
> > > > _______________________________________________
> > > > openMosix-devel mailing list
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> > > > https://lists.sourceforge.net/lists/listinfo/openmosix-devel
> > > 
> > > 
> > > -------------------------------------------------------------------------
> > > Using Tomcat but need to do more? Need to support web services, 
> > security?
> > > Get stuff done quickly with pre-integrated technology to make your 
job 
> > easier
> > > Download IBM WebSphere Application Server v.1.0.1 based on 
Apache 
> > Geronimo
> > > http://sel.as-us.falkag.net/sel?
> > cmd=lnk&kid=120709&bid=263057&dat=121642
> > > _______________________________________________
> > > openMosix-devel mailing list
> > > openMosix-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > > https://lists.sourceforge.net/lists/listinfo/openmosix-devel
> > > 
> > 
> > 
> > --
> > Ian Latter
> > Late night coder ..
> > http://midnightcode.org/
> > 
> > 
> > -------------------------------------------------------------------------
> > Using Tomcat but need to do more? Need to support web services, 
security?
> > Get stuff done quickly with pre-integrated technology to make your job 
easier
> > Download IBM WebSphere Application Server v.1.0.1 based on Apache 
Geronimo
> > http://sel.as-us.falkag.net/sel?
cmd=lnk&kid=120709&bid=263057&dat=121642
> > _______________________________________________
> > openMosix-devel mailing list
> > openMosix-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > https://lists.sourceforge.net/lists/listinfo/openmosix-devel
> > 
> -- 
> Niels de Vos
> http://nixpanic.net/
> [email protected]
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, 
security?
> Get stuff done quickly with pre-integrated technology to make your job 
easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache 
Geronimo
> http://sel.as-us.falkag.net/sel?
cmd=lnk&kid=120709&bid=263057&dat=121642_______________________
________________________
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> 


--
Ian Latter
Late night coder ..
http://midnightcode.org/


-------------------------------------------------------------------------
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