memtx: introduce read view statistics #8510
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Closes tarantool#8501 @TarantoolBot document Title: Document memtx read view statistics New entries have been added to `box.stat.memtx()` output: ``` tarantool> box.stat.memtx().data --- - garbage: 0 total: 24986 read_view: 0 ... tarantool> box.stat.memtx().index --- - read_view: 0 total: 933888 ... ``` `data` shows how much memory is allocated for memtx tuples: - `data.total` - total amount of memory allocated for data tuples. This includes `data.read_view` and `data.garbage` plus tuples that are actually stored in memtx spaces. - `data.read_view` - memory held for read views. - `data.garbage` - memory that is unused and scheduled to be freed (freed lazily on memory allocation). `index` shows how much memory is allocated for memtx index extents: - `index.total` - total amount of memory allocated for indexing data. This includes `index.read_view` plus memory used for indexing tuples that are actually stored in memtx spaces. - `index.read_view` - memory held for read views. All numbers are given in bytes. `data.read_view` and `index.read_view` include memory allocated both for system read views (snapshot, replication) and user read views (EE-only). They should be non-zero only if there are open read views. To list all open read views, use `box.read_view.list()`.
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alyapunov
approved these changes
Mar 29, 2023
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New entries have been added to
box.stat.memtx()output:datashows how much memory is allocated for memtx tuples:data.total- total amount of memory allocated for data tuples. This includesdata.read_viewanddata.garbageplus tuples that are actually stored in memtx spaces.data.read_view- memory held for read views.data.garbage- memory that is unused and scheduled to be freed (freed lazily on memory allocation).indexshows how much memory is allocated for memtx index extents:index.total- total amount of memory allocated for indexing data. This includesindex.read_viewplus memory used for indexing tuples that are actually stored in memtx spaces.index.read_view- memory held for read views.All numbers are given in bytes.
data.read_viewandindex.read_viewinclude memory allocated both for system read views (snapshot, replication) and user read views (EE-only). They should be non-zero only if there are open read views. To list all open read views, usebox.read_view.list().Closes #8501
Closes https://github.com/tarantool/tarantool-ee/issues/143