Total Store Ordering (TSO)

Total Store Ordering is the name for the ordering implemented on multi-processor SPARC systems. The SPARC architecture also defines a number of weaker orderings. TSO basically guarantees that loads are visible between processors in the order in which they occurred, the same for stores, and that loads will see the values of earlier stores. There's a very helpful description of this in the SPARC architecture documentation on pages 418-427 (section 9.5). Particularly useful is table 9-2 on page 422, which gives a useful summary of where membar operations are required.

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TSO is the only ordering used by \*Solaris\* on MP SPARC systems. Many SPARC cpus have implemented other orderings such as PSO and RMO that the software has not taken advantage of for a variety of reasons.

Posted by blackbird on August 31, 2007 at 08:19 AM PDT #

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About

Darryl Gove is a senior engineer in the Solaris Studio team, working on optimising applications and benchmarks for current and future processors. He is also the author of the books:
Multicore Application Programming
Solaris Application Programming
The Developer's Edge

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