Memory Management in Symunix Ii a Design for Large Scale Shared Memory Multipro
Memory Management in Symunix Ii a Design for Large Scale Shared Memory Multipro
Jan Edler
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The kernel would trap stores to shared cacheable memory, and immediately notify other processors to invali- date their caches. C) Do not enforce cache consistency in the kernel, but provide for user mode control over cacheability. Option a) is not adequate, because there are a significant number of parallel applica- tions for which the ability to cache read-write shared memory is important for performance. A typical example is a parallel program in which each process computes values within a se...c- tion of a grid represented as a multi-dimensional array. Such applications exhibit great locality of reference, with occasional non-local references to neighboring grid sections. Both for ease of programming and compilation, and to allow for dynamic adjustment of the grid and temporary access of neighboring grid sections, the grid array should be allocated in shared memory. Moreover, because of the local nature of the computation, efficiency suffers greatly if shared writable memory is not cacheable.
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