On Tue, July 12, 2011 12:55, Sven Fuchs wrote: > 1 VM ~20 min http://staging.travis-ci.org/#!/svenfuchs/rails/builds/1927 > 5 VMs ~55 min http://staging.travis-ci.org/#!/svenfuchs/rails/builds/1985 > 10 VMs ~125 > min http://staging.travis-ci.org/#!/svenfuchs/rails/builds/1914 > > So it seems to degrade somewhat lineary with the number of VMs. > >
Note: Your system has 1 processor with 4 cores, each of those cores shares a memory pipe to main memory. You have hyper-threading enabled, this means that each of your cores is performing the tasks of two threads. While there are some optimizations with HT such as pipelining, it doesn't double-up the processing capacity of each core. You are running all systems on a single disk, this means that there is another potential choke point there. While virtualisation is great, don't expect to get 8 times the performance of a single core, non-HT equivalent processor on a quad-core HT-enabled one. There are many potential bottlenecks here, to identify what is the _current_ bottleneck would require some granular monitoring of the system as a whole and attempting to overcome that. Hope that helps. Giles ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2 _______________________________________________ VBox-users-community mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/vbox-users-community
