Absolutely. Best practice is still to disable swap entirely on server machines; mlockall is just our best attempt to at least keep your JVM from swapping if you've forgotten this.
On Thu, Apr 12, 2012 at 11:15 AM, Omid Aladini <omidalad...@gmail.com> wrote: > Hi, > > Cassandra issues an mlockall [1] before mmap-ing sstables to prevent > the kernel from paging out heap space in favor of memory-mapped > sstables. I was wondering, what happens to the off-heap row cache > (saved or unsaved)? Is it possible that the kernel pages out off-heap > row cache in favor of resident mmap-ed sstable pages? > > Thanks, > Omid > > [1] http://pubs.opengroup.org/onlinepubs/007908799/xsh/mlockall.html -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
