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HugePages

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What are HugePages?

For an introduction for HugePages check [[ https://en.wikipedia.org/wiki/Page_%28computer_memory%29#Huge_pages |HugePage@Wiki ]]

Why use HugePages?

How to use HugePages?

The following hugepages are available on hazelhen:

craype-hugepages128K  craype-hugepages2M    craype-hugepages512M
craype-hugepages128M  craype-hugepages32M   craype-hugepages64M
craype-hugepages16M   craype-hugepages4M    craype-hugepages8M
craype-hugepages256M  craype-hugepages512K

If you want to use HugePages you have to do both of the steps below if you compile yourself.

Self compiled applications

  • During Compilation
    • one of the craype-hugepages<size> (i.e. craype-hugepages16M) modules has to be loaded.
    • This will link the hugepages library to your application.
  • During runtime
    • Load the craype-hugepages<size> module with the pagesize you want to use.
    • The size chosen during runtime is completely independent from the size you have chosen during compilation.
    • Therefore you can compile once and test different sizes during runtime without changing the binary.

precompiled, dynamically linked applications