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• W2127605311 abstract "Summary form only given. Dismal performance often results when the memory requirements of a process exceed the physical memory available to it. Moreover, significant throughput reduction is experienced when this process is part of a synchronous parallel job on a nondedicated computational cluster. A possible solution is to develop programs that can dynamically adapt their memory usage according to the current availability of physical memory. We explore this idea on scientific computations that perform repetitive data accesses. Part of the program's data set is cached in resident memory, while the remainder that cannot fit is accessed in an out-of-core fashion from disk. The replacement policy can be user defined. This allows for a graceful degradation of performance as memory becomes scarce. To dynamically adjust its memory usage, the program must reliably answer whether there is a memory shortage or surplus in the system. Because operating systems typically export limited memory information, we develop a parameter-free algorithm that uses no system information beyond the resident set size (RSS) of the program. Our resulting library can be called by scientific codes with little change to their structure or with no change at all, if computations are already blocked for reasons of locality. Experimental results with both sequential and parallel versions of a memory-adaptive conjugate-gradient linear system solver show substantial performance gains over the original version that relies on the virtual memory system. Furthermore, multiple instances of the adaptive code can coexist on the same node with little interference with one another." @default.
• W2127605311 created "2016-06-24" @default.
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• W2127605311 date "2004-06-10" @default.
• W2127605311 modified "2023-10-14" @default.
• W2127605311 title "Adapting to memory pressure from within scientific applications on multiprogrammed COWs" @default.
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• W2127605311 doi "https://doi.org/10.1109/ipdps.2004.1303002" @default.
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