Jeff Savit wrote: > Hi Dennis, > > You might not have enough RAM for 1,000. (Only 2MB/zone! Not counting > RAM needed for the kernel) For discussion, see Jeff Victor's blog > http://blogs.sun.com/JeffV/ especially the 3 entries titled "Spawning > 0.5kZ/hr". He reasched 1,000 zones, but he had more RAM. There are a > few kernel tunables he mentions that you'll need to adjust. I suggest > bring up an initial zone, turning off services you won't use in your > test (eg: svcadm disable webconsole; svcadm disable sendmail) to reduce > the memory footprint and number of processses. > > Each will have a JRE, even within a sparse root - No extra effort for > that. Each zone will have its own IP address too. I'll let somebody who > knows the other networking parts answer them > > regards, Jeff S > > Dennis wrote: > >> Hi, >> >> a friend of mine has written a P2P application in Java as a master thesis. >> Now we want to setup a testing configuration using containers to simulate >> the function of each node. Therefore I have several question, any help is >> appreciated >> >> - We are planning to test 1000 nodes (=containers) on a 2 GB RAM Athlon Dual >> Core 4.2 GHz machine. Is that possible?
I'll make a stronger statement than JeffS: a Solaris container requires at least 20MB of RAM to boot and start up even the most basic services. Running all of them *simultaneously* is unlikely to work: the system would be paging to disk all of the time. But if you only plan to run 10-20 containers at one time, things should work well until you run java vm's in each of them. I would be very interested in hearing the results of such a test, as I have never done that. The re-use of java text pages will increase the maximum usable number. >> - Each container should be a sparse zone that contains no application but a >> JRE. How do I create one of these? >> - Each node has its own IP adress >> - To simulate it as realistic as possible, we want to give each node a >> certain bandwith with crossbow. Is that possible with the lo interface or >> only with an external nic? >> - What is the recommended way to examine the traffic on a vnic if possible, >> or on each container? >> - Is there a way to check if a certain file is read or written in a >> container directory from the global zone? Each container has its own root directory. Each of those root directories is loopback-mounted from a directory in the global zone. Because of that, he root user in the global zone can traverse a non-global zone's directory tree. There is one exception: the global zone's root user cannot access an NFS share that a non-global zone has mounted into its directory tree. -- -------------------------------------------------------------------------- Jeff VICTOR Sun Microsystems jeff.victor @ sun.com OS Ambassador Sr. Technical Specialist Solaris 10 Zones FAQ: http://www.opensolaris.org/os/community/zones/faq -------------------------------------------------------------------------- _______________________________________________ zones-discuss mailing list zones-discuss@opensolaris.org
