56 lines
2.7 KiB
Plaintext
56 lines
2.7 KiB
Plaintext
Introduction:
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====================================================================================================================
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NUMA ( Non-Uniform Memory Access ) is topology in which, time taken in accessing a memory dependes upon
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the local node or remote node memory. With the help of numa libraries or numactl command we could able
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to use the numa topology such that we can run an application on a specified node ( node affinity ) and
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also, we can apply memory policies such that an application running on a node can get memory alloctaion
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from any specified nodes memory. So, we can use the policies offered by numa libraries or numactl command
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to either decrease the memory latencies or increase the memory bandwidth by properly applying polcies.
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Please refer http://lse.sourceforge.net/numa/ to know the basics of numa and refer
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http://www.novell.com/collateral/4621437/4621437.pdf to understand the usage of numactl and numa libraries.
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We can always get the latest package from http://oss.sgi.com/projects/libnuma/.
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Testcase Description:
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====================================================================================================================
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numa01.sh shell script holds all the numa testcases and support_numa.c will help numa01.sh as and when needed.
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Testcase1:
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Verifies the node affinity and memory affinity by running the support_numa process which will allocate 1MB of memory.
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TestCase2:
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Verifies the preferred node memory policy which will allocate memory from the node we specify. This
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testcase will use the support_numa process for the verfication.
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TestCase3:
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Verifies the memory interleaving policy which will distribute the memory evenly among all nodes. This
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testcase will use the support_numa process for the verfication.
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TestCase4:
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Verifies the physical cpu affinity which runs the process support_numa on the specified physical cpu number.
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TestCase5:
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Verifies the local allocation policy which always allocates memory from the local node. This testcase
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will use the support_numa process for the verfication.
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TestCase6:
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Verifies the memory interleaving policy which will distribute the memory evenly among all nodes. This
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testcase will use memhog for the verfication.
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TestCase7:
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Verifies the numa_node_size api with hardware checking.
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TestCase8:
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Verifies the hugepage memory allocated from the node we specify.
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TestCase9:
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Verifies the preferred node policy with THP memory allocating from the node we specify.
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Pre-requisites
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====================================================================================================================
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* libnuma should be installed on the NUMA machine before executing theses testcases
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* Testcases will not run by default in LTP-runall, they also skip on non-numa machines
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