Chris, We have total memory on the machine as 16G so we kept 50% to heap . initial we had CMS we had same issues so thought of changing to G1GC we have the same problem still > On Jun 13, 2018, at 9:52 AM, Chris Lohfink <clohf...@apple.com> wrote: > > The gc log file is best to share when asking for help with tuning. The top of > file has all the computed args it ran with and it gives details on what part > of the GC is taking time. I would guess the CPU spike is from full GCs which > with that small heap of a heap is probably from evacuation failures. > Reserving more of the heap to be free (-XX:G1ReservePercent=25) can help, > along with increasing the amount of heap. 8GB is pretty small for G1, might > be better off with CMS. > > Chris > >> On Jun 13, 2018, at 8:42 AM, rajpal reddy <rajpalreddy...@gmail.com> wrote: >> >> Hello, >> >> we are using G1GC and noticing garbage collection taking a while and during >> that process we are seeing cpu spiking up to 70-80%. can you please let us >> know. if we have to tune any parameters for that. attaching the >> cassandra-env file with jam-options.<cassandra-env.txt> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org >> For additional commands, e-mail: user-h...@cassandra.apache.org > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org >
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