| Up to higher level directory | |||
| Name | Date | Size | |
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| .gitignore | 05-Oct-2017 | 30 | |
| Makefile | 05-Oct-2017 | 1K | |
| numa01.sh | 05-Oct-2017 | 23.9K | |
| numa_node_size.c | 05-Oct-2017 | 3.5K | |
| README | 05-Oct-2017 | 3.4K | |
| support_numa.c | 05-Oct-2017 | 5K | |
| test.sh | 05-Oct-2017 | 2K | |
README
1 Introduction: 2 3 ==================================================================================================================== 4 5 NUMA ( Non-Uniform Memory Access ) is topology in which, time taken in accessing a memory dependes upon 6 the local node or remote node memory. With the help of numa libraries or numactl command we could able 7 to use the numa topology such that we can run an application on a specified node ( node affinity ) and 8 also, we can apply memory policies such that an application running on a node can get memory alloctaion 9 from any specified nodes memory. So, we can use the policies offered by numa libraries or numactl command 10 to either decrease the memory latencies or increase the memory bandwidth by properly applying polcies. 11 12 Please refer http://lse.sourceforge.net/numa/ to know the basics of numa and refer 13 http://www.novell.com/collateral/4621437/4621437.pdf to understand the usage of numactl and numa libraries. 14 15 We can always get the latest package from ftp://ftp.suse.com/pub/people/ak/numa. 16 17 Testcase Description: 18 ==================================================================================================================== 19 numa01.sh shell script holds all the numa testcases and support_numa.c will help numa01.sh as and when needed. 20 21 Testcase1: 22 Verifies the node affinity and memory affinity by running the support_numa process which will allocate 1MB of memory. 23 24 TestCase2: 25 Verifies the preferred node memory policy which will allocate memory from the node we specify. This 26 testcase will use the support_numa process for the verfication. 27 28 TestCase3: 29 Verifies the memory interleaving policy which will distribute the memory evenly among all nodes. This 30 testcase will use the support_numa process for the verfication. 31 32 TestCase4: 33 Verifies the physical cpu affinity which runs the process support_numa on the specified physical cpu number. 34 35 TestCase5: 36 Verifies the local allocation policy which always allocates memory from the local node. This testcase 37 will use the support_numa process for the verfication. 38 39 TestCase6: 40 Verifies the memory interleaving policy on the shared memory which will interleave the shared memory on 41 all nodes equally. Here, the testcase use touch command instead of running a seperate process to verify 42 the policy applied. 43 44 Pre-requisites 45 ==================================================================================================================== 46 * libnuma should be installed on the NUMA machine before executing theses testcases 47 * Testcases can also be executed on non-numa machines, but they will fail, 48 49 Building the Tescases 50 ==================================================================================================================== 51 From LTP-Root, use <make> to build the testcases 52 ltp-full-20070731]$ make 53 or, from 54 ltp-full-20070731_numa/testcases/kernel/numa]# make 55 56 Installing the Testcases 57 ==================================================================================================================== 58 From LTP-Root, use <make> to install the testcases 59 ltp-full-20070731]$ make install 60 or, from 61 ltp-full-20070731_numa/testcases/kernel/numa]# make install 62 63 Running the Tescases 64 ==================================================================================================================== 65 From LTP-Root, invoke ./runltp 66 ltp-full-20070731]$ ./runltp -p -l <logfile> -f numa 67 68 * NUMA testcases will not run by default in LTP-runall 69
