Re: Recommendations
"Moshe Bar" <[email protected]> Wed, 18 Jul 2007 11:20:52 -0500
| Newsgroups | gmane.linux.cluster.openmosix.general |
|---|---|
| Message-ID | <[email protected]> |
--===============1388820885== Content-Type: multipart/related; boundary="----=_Part_95426_11070526.1184775652951" ------=_Part_95426_11070526.1184775652951 Content-Type: multipart/alternative; boundary="----=_Part_95425_286151.1184775652951" ------=_Part_95425_286151.1184775652951 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Robert openMosix *is* SMP safe, and has been for the past 10 years or so. openMosix does not, however, support thread migration. We had it in the past, and the performance is very slow because of true and false sharing over the network. Moshe On 7/18/07, pogson <[email protected]> wrote: > > On Wed, 2007-18-07 at 07:24 -0700, Wes Wagner wrote: > > The other virtue of > openmosix is the ability to PXE boot/CD boot random systems all over the > network and borrow them, plus later gracefully shut them down. > > > Last year I set up an LTSP system that used multiple servers. OpenMosix > showed promise with a very flexible clustering solution. I was wishing 2.6/Opteron/MigSHM > were available. As it turned out, I used static allocation which would be > painful whenever I needed to do any work on a server. Fortunately uptime was > good. > > I often work in computer labs where 24 PCs sit idling with a few users > clicking and gawking. OM can put them to work while SMP cannot. > > The question about the need for OpenMosix vs SMP is interesting. In the > universe there must be quite a mix of needs. Some mixes worked very well > with OM 2.4 . Perhaps the obstacle is "not SMP-safe". As many CPUs are > SMP, it would be very inefficient if the logic of OM could not be made to > work with SMP. Why is OM not SMP-safe if most of OM is now to be in > userland? > > There are hundreds of millions of PCs. I would be very surprised if there > were only a few thousand OM clusters out there. Sourceforge shows 384,668 > downloads and there are several distros incorporating OM technology. I am > sure activity would increase if 2.6 could be finished. > > Maybe it is time I learned C and kernel-hacking. If only I weren't so > old... [image: ;-)] > > Robert Pogson > > > -- > A problem is an opportunity. > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > openMosix-general mailing list > openMosix-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org > https://lists.sourceforge.net/lists/listinfo/openmosix-general > > ------=_Part_95425_286151.1184775652951 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Robert<br><br>openMosix *is* SMP safe, and has been for the past 10 years or so. <br><br>openMosix does not, however, support thread migration. We had it in the past, and the performance is very slow because of true and false sharing over the network. <br><br>Moshe<br><br><br><div><span class="gmail_quote">On 7/18/07, <b class="gmail_sendername">pogson</b> <<a href="mailto:[email protected]">[email protected]</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div><span class="q"> On Wed, 2007-18-07 at 07:24 -0700, Wes Wagner wrote:<br> <blockquote type="CITE"> <tt><font color="#000000">The other virtue of</font></tt><br> <tt><font color="#000000">openmosix is the ability to PXE boot/CD boot random systems all over the</font></tt><br> <tt><font color="#000000">network and borrow them, plus later gracefully shut them down.</font></tt><font color="#000000"> </font><br> </blockquote></span> <br> Last year I set up an LTSP system that used multiple servers. OpenMosix showed promise with a very flexible clustering solution. I was wishing 2.6/Opteron/MigSHM were available. As it turned out, I used static allocation which would be painful whenever I needed to do any work on a server. Fortunately uptime was good. <br> <br> I often work in computer labs where 24 PCs sit idling with a few users clicking and gawking. OM can put them to work while SMP cannot.<br> <br> The question about the need for OpenMosix vs SMP is interesting. In the universe there must be quite a mix of needs. Some mixes worked very well with OM 2.4 . Perhaps the obstacle is "not SMP-safe". As many CPUs are SMP, it would be very inefficient if the logic of OM could not be made to work with SMP. Why is OM not SMP-safe if most of OM is now to be in userland? <br> <br> There are hundreds of millions of PCs. I would be very surprised if there were only a few thousand OM clusters out there. Sourceforge shows 384,668 downloads and there are several distros incorporating OM technology. I am sure activity would increase if 2.6 could be finished.<br> <br> Maybe it is time I learned C and kernel-hacking. If only I weren't so old... <img src="cid:1184772184.10402.104.camel@Beast" alt=";-)" align="middle" border="0"><br> <br> Robert Pogson<br> <table cellpadding="0" cellspacing="0" width="100%"> <tbody><tr> <td> <pre> -- A problem is an opportunity. </pre> <br></td> </tr> </tbody></table> </div> <br>-------------------------------------------------------------------------<br>This SF.net email is sponsored by DB2 Express<br>Download DB2 Express C - the FREE version of DB2 express and take<br>control of your XML. No limits. Just data. 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