On Thu, 24 Feb 2005, Gordon Russell wrote: > We have a cluster of 5 machines, each running about 15 UMLs. Things > seem to run great for a while, then performance of the UMLs seems to > die for a while. > --snip-- > Machines are all 1GB or better, 2GHz or better, on a 0.1GB network > backbone.
With 15 guests per host, could you be running yourself out of physical memory? If one guest got memory-intensive it could set all of them thrashing, until the memory-intensive task finished, causing a major slowdown for everyone. Use "top" or "ps" on the host to look at the resident set size of the guests and the memory and swap summaries, and vmstat on the host and the guests to see who was swapping how much in and out. If you gave each guest skimpy memory and a generous swap file, only the memory-intensive guest would be slowed down, except when other tasks needed to use the disc. I've had good results with openvpn, but wouldn't have thought of it for connecting from a student's workstation to a UML guest. James F. Carter Voice 310 825 2897 FAX 310 206 6673 UCLA-Mathnet; 6115 MSA; 405 Hilgard Ave.; Los Angeles, CA, USA 90095-1555 Email: [EMAIL PROTECTED] http://www.math.ucla.edu/~jimc (q.v. for PGP key) ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
