README
1Introduction:
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3====================================================================================================================
4
5NUMA ( Non-Uniform Memory Access ) is topology in which, time taken in accessing a memory dependes upon
6the local node or remote node memory. With the help of numa libraries or numactl command we could able
7to use the numa topology such that we can run an application on a specified node ( node affinity ) and
8also, we can apply memory policies such that an application running on a node can get memory alloctaion
9from any specified nodes memory. So, we can use the policies offered by numa libraries or numactl command
10to either decrease the memory latencies or increase the memory bandwidth by properly applying polcies.
11
12Please refer http://lse.sourceforge.net/numa/ to know the basics of numa and refer
13http://www.novell.com/collateral/4621437/4621437.pdf to understand the usage of numactl and numa libraries.
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15We can always get the latest package from http://oss.sgi.com/projects/libnuma/.
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17Testcase Description:
18====================================================================================================================
19numa01.sh shell script holds all the numa testcases and support_numa.c will help numa01.sh as and when needed.
20
21Testcase1:
22Verifies the node affinity and memory affinity by running the support_numa process which will allocate 1MB of memory.
23
24TestCase2:
25Verifies the preferred node memory policy which will allocate memory from the node we specify. This
26testcase will use the support_numa process for the verfication.
27
28TestCase3:
29Verifies the memory interleaving policy which will distribute the memory evenly among all nodes. This
30testcase will use the support_numa process for the verfication.
31
32TestCase4:
33Verifies the physical cpu affinity which runs the process support_numa on the specified physical cpu number.
34
35TestCase5:
36Verifies the local allocation policy which always allocates memory from the local node. This testcase
37will use the support_numa process for the verfication.
38
39TestCase6:
40Verifies the memory interleaving policy which will distribute the memory evenly among all nodes. This
41testcase will use memhog for the verfication.
42
43TestCase7:
44Verifies the numa_node_size api with hardware checking.
45
46TestCase8:
47Verifies the hugepage memory allocated from the node we specify.
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49TestCase9:
50Verifies the preferred node policy with THP memory allocating from the node we specify.
51
52Pre-requisites
53====================================================================================================================
54 * libnuma should be installed on the NUMA machine before executing theses testcases
55 * Testcases will not run by default in LTP-runall, they also skip on non-numa machines
56