Hi!
I have a program ( written on C++ and compiled by Intel Parallel Studio XE 2018 ), which needs a lot of memory & CPU cores ( MPI ). During execution maximum memory usage for test example of input data is about 110 Gb. When I run it on server with 512 Gb ( or above ), the computation time is124 min. When I take off 10 ( of 12 ) memory module, and total memory reduces to 128 Gb, the computation time reduces to 30 min.
Server Lenovo, 2 x Intel(R) Xeon(R) Gold 6134 CPU @ 3.20GHz, Windows Server 2016 Standard. The memory modules are DDR4 64Gb ECC 2666MHz, passed all tests.
The same effect I see on HP, Dell, SuperMicro servers.
Can anybody explain this ?
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Less memory - computation faster ?
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