Firefly is a shared-memory multiprocessor workstation, created by DEC Systems Research Center. The Systems Research Center ( SRC) was a research laboratory created by Digital Equipment Corporation (DEC in 1984, in Palo Alto, California Its first version built contains up to seven MicroVAX 78032 processors. Name "VAX" was originally an Acronym for V irtual A ddress e' X' tension, both because the VAX was seen as a 32-bit The cache from each of the processors keep a consistent view of the same main memory using a cache coherency algorithm. In computing Cache coherency (also cache coherence) refers to the integrity of data stored in local caches of a shared resource The second version of the Firefly contains faster CVAX 78034 processors.
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Hardware description
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Processors
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Processor boards
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Memory and cache
The Firefly processors communicate with the main memory through individual caches and a dedicated bus named MBus. The following table shows some information about the two versions of the Firefly.
| MicroVAX Version | CVAX Version | |
|---|---|---|
| memory size | 4Mb to 16Mb | 32Mb to 128Mb |
| memory access time | 400ns | 200ns |
| cache size | 4096 four-byte lines | 16384 four-byte lines |
| cache type | direct mapped | direct mapped |
The Firefly_protocol is used to ensure cache coherence. The Firefly Cache coherence protocol is the schema used in the DEC Firefly multiprocessor workstation developed by DEC Systems Research Center. In computing Cache coherency (also cache coherence) refers to the integrity of data stored in local caches of a shared resource
Benchmarks
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Conclusions
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See also
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External links
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