how do i find out if JVM is GCing? On Sun, Jul 12, 2009 at 10:37 PM, Sandeep Tata <[email protected]>wrote:
> What hardware are you running one? dual quadcore intel xeon 2.0 ghz, 32GB ram, and hardware raid config operating system is fedora core 9 How long does the slowdown last ? i stopped inserting data after slowdown starts, and it is still slow now after over 10 hours. however if i stop cassandra and start it, it becomes super fast immediately. till i insert another 100k or so rows when it becomes really slow again. > > There are a few reasons for temporary slowdowns ... perhaps the JVM > started GCing? how do i find out if this is the cause? > Cassandra spends time cleaning up the on-disk SSTables > in a process called compaction. This could cause the client to observe > a slowdown. > > Things you could try -- > Reduce the Memtable size in the config files. (If GCing was the problem) > Increasing the number of SSTables written before compaction kicks in. > can you tell me what numbers i should use? thanks!
