> This would require that Cassandra run as root on Linux systems, as 'man > mlockall' states:
IIRC, mlock() (as opposed to mlockall()) does not require root privileges - but is subject to resource limitations. However, given a lack of control of how memory is allocated in the JVM I suppose mlock() is probably not very useful. > http://andrigoss.blogspot.com/2008/02/jvm-performance-tuning.html > > Basically when mmapping using HUGETLB you don't have to be root, but your > memory ends up being effectively locked, so that would prevent the swapping, > and might have the added bonus of slightly faster memory allocation/access. Very nice, especially since it doesn't require native code/tricks. I imagine the need for contiguous space could be a practical annoyance though. Has anyone tried this specifically with cassandra? -- / Peter Schuller
