we have this has the Heap settings . is the HEAP_NEWSIZE is required only for CMS. can we get rid of that for G1GC so that it can be used? MAX_HEAP_SIZE="8192M" HEAP_NEWSIZE=“800M"
> On Jun 13, 2018, at 11:15 AM, Chris Lohfink <clohf...@apple.com> wrote: > > That metric is the total number of seconds spent in GC, it will increase over > time with every young gc which is expected. Whats interesting is the rate of > growth not the fact that its increasing. If graphing tool has option to graph > derivative you should use that instead. > > Chris > >> On Jun 13, 2018, at 9:51 AM, rajpal reddy <rajpalreddy...@gmail.com >> <mailto:rajpalreddy...@gmail.com>> wrote: >> >> jvm_gc_collection_seconds_count{gc="G1 Young Generation”} and also young >> generation seconds count keep increasing >> >> <PastedGraphic-1.png> >> >>> On Jun 13, 2018, at 9:52 AM, Chris Lohfink <clohf...@apple.com >>> <mailto: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 >>>> <mailto: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 >>>> <mailto:user-unsubscr...@cassandra.apache.org> >>>> For additional commands, e-mail: user-h...@cassandra.apache.org >>>> <mailto:user-h...@cassandra.apache.org> >>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org >>> <mailto:user-unsubscr...@cassandra.apache.org> >>> For additional commands, e-mail: user-h...@cassandra.apache.org >>> <mailto:user-h...@cassandra.apache.org> >>> >> >
