Denis, Do we really need to measure cache sizes precisely? We can use approach 1 and also we have average pagesFillFactor metric. These two metrics can give a good estimation of page memory size per cache.
2018-03-22 21:04 GMT+03:00 Denis Magda <dma...@apache.org>: > Igniters, > > Glad to see that 2.4 made it possible to show memory usage in bytes for > data regions. Good progress but it's definitely not enough. > > I'd like to discuss how we can support "memory usage per cache/table" in > bytes. That's actually what the users are interested in. Talking to Alex G. > we came up with 2 possible approaches: > > 1. Usage of a per cache counter that accumulates total size of all binary > objects passed through our cache update/insert/remove API. Pros: easy to > implement. Cons: we don't consider extra space taken by our data pages and > other memory components. > > 2. To address the cons of 1. we can count the size of the data pages, but > in that scenario, a data page must not store entries of varies cache. This > approach is ideal for the memory usage by cache reporting but requires more > changes in the architecture side. > > Alex G., please step in and give more details suggesting your approach. > > Others, please join the discussion as well. > > -- > Denis > -- Best regards, Andrey Kuznetsov.
