MULTIPROCESSOR SYSTEM WITH MULTIPLE CONCURRENT MODES OF EXECUTION

摘要

A multiprocessor system supports multiple concurrent modes of speculative execution. Speculation identification numbers (IDs) are allocated to speculative threads from a pool of available numbers. The pool is divided into domains, with each domain being assigned to a mode of speculation. Modes of speculation include TM, TLS, and rollback. Allocation of the IDs is carried out with respect to a central state table and using hardware pointers. The IDs are used for writing different versions of speculative results in different ways of a set in a cache memory.

主权项

1. A computer method, wherein the operations comprise carrying out operations in a multiprocessor system, the operations comprising:
allocating at least one identification number to a thread executing speculatively; maintaining directory based speculation control responsive to the identification number; counting instances of use of the identification number being active in the multiprocessor system; and preventing the identification number from being allocated to a new thread until the counting indicates no instances of use of that ID being active in the system.