Invention Publication
EP0514024A2 Method and apparatus for an improved memory architecture
失效
Verfahren und Vorrichtungfüreine verbesserte Speicherarchitektur。
- Patent Title: Method and apparatus for an improved memory architecture
- Patent Title (中): Verfahren und Vorrichtungfüreine verbesserte Speicherarchitektur。
-
Application No.: EP92303551.3Application Date: 1992-04-21
-
Publication No.: EP0514024A2Publication Date: 1992-11-19
- Inventor: Frailong, Jean-Marc , Sindhu, Pradeep , Cekleov, Michel , Powell, Michael , Jenson, Eric
- Applicant: SUN MICROSYSTEMS, INC.
- Applicant Address: 2550 Garcia Avenue Mountain View, CA 94043 US
- Assignee: SUN MICROSYSTEMS, INC.
- Current Assignee: SUN MICROSYSTEMS, INC.
- Current Assignee Address: 2550 Garcia Avenue Mountain View, CA 94043 US
- Agency: Wombwell, Francis
- Priority: US702781 19910517
- Main IPC: G06F9/38
- IPC: G06F9/38
Abstract:
An improved memory model and implementation is disclosed. The memory model includes a Total Store Ordering (TSO) and Partial Store Ordering (PSO) memory model to provide a partial order for the memory operations which are issued by multiple processors. The TSO memory model includes a FIFO Store Buffer for Store, and Atomic Load-Store operations. The Load operations are not placed in the FIFO Store Buffer. The Load operation checks for a value stored in the same location in the FIFO Store Buffer; if no such value is found, then requested value is returned from memory. The PSO model also includes a Store Buffer for Store, and Atomic Load-Store operations. However, unlike the TSO model, the Store Buffer in the PSO model is not FIFO. The processors in the PSO model may issue the Store and Atomic Load-Store in a certain order; however, such operations may be executed by memory out of the order issued by the processors. The execution order is assured only by address matching and the STBAR operation. Two Store operations separated by a STBAR operations guarantees memory will execute the operations in an order issued by the processors. Load operations in the PSO model are not placed in the Store Buffer. The Load operation first checks for a value stored in the same location in the Store Buffer; if no such value is found, then the requested value is returned from memory.
Public/Granted literature
- EP0514024B1 Method and apparatus for an improved memory architecture Public/Granted day:2000-06-28
Information query