Advanced Versioned Memory

A non-transitory computer readable medium having stored thereon machine readable instructions to provide versioned memory implementation, the machine readable instructions, when executed, cause a computer system to:

• compare, by a processor, a global memory version to a block memory version, the global memory version corresponding to a plurality of memory blocks, and the block memory version corresponding to one of the plurality of memory blocks;
• evaluate a subblock-bit-vector (SBV) corresponding to a plurality of subblocks of the one of the plurality of memory blocks;
• based on the comparison and the evaluation, determine in which level in a cell of one of the plurality of subblocks of the one of the plurality of memory blocks checkpoint data is stored;
• detect an error state of data stored in the cell;
• and
• read the checkpoint data stored in the determined level in the cell to recover from the error state.

A versioned memory implementation apparatus comprising:

• a memory controller circuit to:
• compare a global memory version to a block memory version, the global memory version corresponding to a plurality of memory blocks, and the block memory version corresponding to one of the plurality of memory blocks;
• evaluate a subblock-bit-vector (SBV) corresponding to a plurality of subblocks of the one of the plurality of memory blocks;
• and
• based on the comparison and the evaluation, determine in which level in a cell of one of the plurality of subblocks of the one of the plurality of memory blocks checkpoint data is stored.