Firefly is a shared-memory multiprocessor workstation, created by DEC Systems Research Center. Its first version built contains up to seven MicroVAX 78032 processors. The cache from each of the processors keep a consistent view of the same main memory using a cache coherency algorithm. The second version of the Firefly contains faster CVAX 78034 processors.
Contents |
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.
Benchmarks
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Conclusions
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See also
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