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Performance: Difference between revisions
→Multi-socket machines
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Multi-socket machines consist of several nodes each comprising several CPUs and some amount of memory. The nodes are connected by specialized hardware (sometimes called interconnect or bus) that transports data between the nodes. Typically, node-local memory is faster to read and write than memory on a different node. This NUMA (non-uniform memory architecture) setup has consequences for the performance when used for running XDS jobs. | Multi-socket machines consist of several nodes each comprising several CPUs and some amount of memory. The nodes are connected by specialized hardware (sometimes called interconnect or bus) that transports data between the nodes. Typically, node-local memory is faster to read and write than memory on a different node. This NUMA (non-uniform memory architecture) setup has consequences for the performance when used for running XDS jobs. | ||
In particular, good performance is obtained if MAXIMUM_NUMBER_OF_JOBS is chosen as the number of nodes, and MAXIMUM_NUMBER_OF_PROCESSORS is chosen as the number of CPU cores (physical + virtual) of each socket. One then has to take care that each job ends up on its own socket. The following scripts do this. Please note that < | In particular, good performance is obtained if MAXIMUM_NUMBER_OF_JOBS is chosen as the number of nodes, and MAXIMUM_NUMBER_OF_PROCESSORS is chosen as the number of CPU cores (physical + virtual) of each socket. One then has to take care that each job ends up on its own socket. The following scripts do this. Please note that <tt>numactl</tt> has to be installed. | ||
<pre> | <pre> | ||
#!/bin/bash | #!/bin/bash | ||