On 10/20/2011 09:38 AM, Maxim Potekhin wrote: > I happen to have 48GB on each machines I use in the cluster. Can I > assume that I can't really use all of this memory productively? Do you > have any suggestion related to that? Can I run more than one instance on > Cassandra on the same box (using different ports) to take advantage of > this memory, assuming the disk has enough bandwidth?
You are likely to not have good luck with a JVM heap that large. But you can: - Leave all that memory to the OS page cache. - mmap index files - use an off heap cache All of those are productive uses.
