Methods and systems for performing a replay execution

An apparatus, comprising:

• at least one processor;
• and
• a replayer machine unit configured to execute on the at least one processor to perform a replay of a previous execution of a program to:
• generate an order of recorded chunks of instructions across a plurality of recorded threads generated from the previous execution of the program;
• initiate an execution of the program, the executing program to include a plurality of threads, each thread to include a number of chunks of instructions;
• store a reference to a chunk of a thread and an instruction range of the chunk, wherein the reference is an indication that the chunk is active;
• intercept an instruction of the executing program before the instruction is executed;
• determine that the intercepted instruction is not supposed to run based, at least in part, on the order of recorded chunks, wherein determining that the intercepted instruction is not supposed to run includes comparing the intercepted instruction to the instruction range corresponding to the reference and determining that the intercepted instruction is outside the instruction range;
• determine whether to change the indication that the chunk is active based, at least in part, on determining that the intercepted instruction is not supposed to run;
• and
• determine whether to stall the intercepted instruction based, at least in part, on determining whether to change the indication that the chunk is active.

A method to perform a replay of a previous execution of a program, the method comprising:

• generating an order of recorded chunks of instructions across a plurality of recorded threads generated from the previous execution of the program;
• initiating an execution of the program, the executing program to include a plurality of threads, each thread to include a number of chunks of instructions;
• storing a reference to a chunk of a thread and an instruction range of the chunk, wherein the reference is an indication that the chunk is active;
• intercepting an instruction of the executing program before the instruction is executed;
• determining that the intercepted instruction is not supposed to run based, at least in part, on the order of recorded chunks, wherein determining that the intercepted instruction is not supposed to run includes comparing the intercepted instruction to the instruction range corresponding to the reference and determining that the intercepted instruction is outside the instruction range;
• determining whether to change the indication that the chunk is active based, at least in part, on determining that the intercepted instruction is not supposed to run;
• and
• determining whether to stall the intercepted instruction based, at least in part, on the determining whether to change the indication that the chunk is active.