Peter, Measure it basing under your load. Sometimes it’s enough to have Java heaps 8 GB in size to work under significant load with off-heap data in hundreds of GBs in size.
— Denis > On Jul 5, 2016, at 3:20 PM, Peter Schmitt <[email protected]> wrote: > > Hi Denis, > > we are trying to store a huge amount of data off-heap (more than 50 GB). > Therefore, we need to know the heap-size which is needed by Ignite to handle > such a huge off-heap cache (which we only need to keep the heap-size as low > as possible due to the GC overhead). > > Kind regards > Peter > > > > 2016-07-05 11:41 GMT+02:00 Denis Magda <[email protected] > <mailto:[email protected]>>: > Hi Peter, > > Basically it depends on your use case. Sometimes it’s enough 2 GB, sometimes > 5 GB or 10 GB. It depends on the workload. > However you shouldn’t allocate too big Java heaps with size more than 20 GB > because it can lead to long stop-the-world pauses at some time. > > — > Denis > >> On Jul 3, 2016, at 11:29 AM, Peter Schmitt <[email protected] >> <mailto:[email protected]>> wrote: >> >> Hi Val, >> >> after several tests I can confirm that it works with more heap-memory. >> However, I'm not sure how much heap-memory is needed for 50+ GB >> off-heap-data and I can't find hints for it in the docs. >> >> Kind regards >> Peter >> >> >> >> 2016-06-30 22:23 GMT+02:00 vkulichenko <[email protected] >> <mailto:[email protected]>>: >> Hi Peter, >> >> It sound like you just don't give enough heap memory to a node. Heap memory >> is still required, even if you store all the data off heap. Can you try to >> your JVM at least 2GB and check if this helps? >> >> -Val >> >> >> >> -- >> View this message in context: >> http://apache-ignite-users.70518.x6.nabble.com/Non-cluster-mode-tp5959p6028.html >> >> <http://apache-ignite-users.70518.x6.nabble.com/Non-cluster-mode-tp5959p6028.html> >> Sent from the Apache Ignite Users mailing list archive at Nabble.com >> <http://nabble.com/>. >> > >
