Techniques for collecting and utilizing activity metrics

A system comprising:

• one or more processors;
• and
• a memory comprising code stored thereon that, when executed, performs a method comprising:
• recording, by a plurality of processing cores, occurrences of read misses and overwrites in entries of a first plurality of tablets designated as active tablets, wherein each of the plurality of processing cores has an associated pair of tablets including one of the first plurality of tablets and one of a second plurality of tablets designated as analytic tablets, wherein said each processing core records occurrences of read misses and overwrites in said one of the first plurality of tablets of the associated pair designated as an active tablet;
• determining, in accordance with one or more switching criteria, to switch roles of the first plurality of tablets and the second plurality of tablets;
• responsive to said determining, switching roles of the first plurality of tablets and the second plurality of tablets, wherein after said switching, the first plurality of tablets is designated as analytic tablets and the second plurality of tablets is designated as active tablets;
• merging, in accordance with physical block indices uniquely identifying physical blocks of storage, entries of the first plurality of tablets designated as analytic tablets, wherein said merging includes:
• generating one of a plurality of tables of merged entries for each of the physical block indices wherein said one table includes merged entries of the first plurality of tablets associated with said each physical block index, wherein each of the physical blocks of storage includes content referenced by one or more virtual blocks of a plurality of virtual blocks;
• updating, in accordance with the plurality of tables, a plurality of metric sets associated with the plurality of virtual blocks;
• determining, using a first of the plurality of metric sets for a first of the plurality of virtual blocks referencing first content stored on a first of the physical blocks of storage, first one or more temperature classifications of the first virtual block at a current point in time;
• and
• determining, in accordance with said first one or more temperature classifications of the first virtual block at the current point in time, placement of the first content referenced by the first virtual block in one of a plurality of storage tiers.

A non-transitory computer readable medium comprising code stored thereon that, when executed, performs a method comprising:

• recording, by a plurality of processing cores, occurrences of read misses and overwrites in entries of a first plurality of tablets designated as active tablets, wherein each of the plurality of processing cores has an associated pair of tablets including one of the first plurality of tablets and one of a second plurality of tablets designated as analytic tablets, wherein said each processing core records occurrences of read misses and overwrites in said one of the first plurality of tablets of the associated pair designated as an active tablet;
• determining, in accordance with one or more switching criteria, to switch roles of the first plurality of tablets and the second plurality of tablets;
• responsive to said determining, switching roles of the first plurality of tablets and the second plurality of tablets, wherein after said switching, the first plurality of tablets is designated as analytic tablets and the second plurality of tablets is designated as active tablets;
• merging, in accordance with physical block indices uniquely identifying physical blocks of storage, entries of the first plurality of tablets designated as analytic tablets, wherein said merging includes:
• generating one of a plurality of tables of merged entries for each of the physical block indices wherein said one table includes merged entries of the first plurality of tablets associated with said each physical block index, wherein each of the physical blocks of storage includes content referenced by one or more virtual blocks of a plurality of virtual blocks;
• updating, in accordance with the plurality of tables, a plurality of metric sets associated with the plurality of virtual blocks;
• determining, using a first of the plurality of metric sets for a first of the plurality of virtual blocks referencing first content stored on a first of the physical blocks of storage, first one or more temperature classifications of the first virtual block at a current point in time;
• and
• determining, in accordance with said first one or more temperature classifications of the first virtual block at the current point in time, placement of the first content referenced by the first virtual block in one of a plurality of storage tiers.