Hi I am observing memory usage in top command, but there in RSS it is showing 18G ( which I think is sum of used memo + page cache). I want to know how to find how much used by Cassandra process and how much of it is in page cache. I want this information because I want to check memory usage for monitoring.
On Sat, Apr 11, 2020 at 9:42 PM Nitan Kainth <nitankai...@gmail.com> wrote: > You can look at top command. There is column of memory > > > Regards, > > Nitan > > Cell: 510 449 9629 > > On Apr 11, 2020, at 11:10 AM, HImanshu Sharma < > himanshusharma0...@gmail.com> wrote: > > > Hi > > But I see memory not decreasing even if there is no traffic on cluster. > How can I find actual memory usage by Cassandra process. If it is OS page > cache then how to find how much is page cache and how much is used by > process? > > Thanks > Himanshu > > On Sat, Apr 11, 2020 at 9:07 PM Laxmikant Upadhyay < > laxmikant....@gmail.com> wrote: > >> It is OS page cache used during read..your os will leverage memory if not >> being used by any other applications and it improves your read performance. >> >> On Sat, Apr 11, 2020, 12:47 PM HImanshu Sharma < >> himanshusharma0...@gmail.com> wrote: >> >>> Hi >>> >>> I am very new to the use of cassandra. In a cassandra cluster of 3 >>> nodes, I am observing memory usage of cassandra process going more than the >>> heap memor allocated. As I understand, cassandra allocates off heap memory >>> for bloom filters, index summary etc. >>> >>> When I run nodetool info, I see off heap memory usage around 1.5G, my >>> heap is 8G. So memory usage should not go above 10G. But in running node >>> it goes as high as 18G with heavy loads. It comes down with different loads >>> but always more than 12G. >>> >>> I would like to know why memory usage is high and is there way to >>> control it. >>> >>> Thanks >>> Himanshu Sharma >>> >>
