![]() ![]() For each processor, the field “physical id” is either 0 or 1, corresponding to one of two physical CPUs. ![]() We can see that there are 16 distinct “processors” with processor IDs 0-15. 15 other cores are displayed in the same format ~]$ Pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avxį16c rdrand lahf_lm ida arat xsaveopt pln pts dts tpr_shadow vnmi flexpriorityĪddress sizes : 46 bits physical, 48 bits virtual Rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tscĪperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr Pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb Model name : Intel(R) Xeon(R) CPU E5-2650 v2 2.60GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov The following output is obtained on ~]$ cat /proc/cpuinfo We do not expect this information to change over time on a given node. The special “/proc/cpuinfo” file can be queried to get information about which CPUs are available on the current node. We make use of the proc filesystem, which contains special files that describe static things like hardware, as well as dynamic things like the current running processes. Note that the discussion on this page is specific to Unix, and might possibly be different on other Unix systems than ours. On this page, we discuss ways of reporting the identity of the host CPU for our processes. A memory intensive job requiring two processes may have vastly different performance if the processes share a physical CPU, than if they are each allocated to their own CPU. Why would this be of interest? For example, on an HPCF2013 node there are two physical CPUs with eight cores each. It may also be of interest to find out which processor cores are in use, although this is also more difficult to control. ![]() In the how to run tutorial, we discussed how to select the number of nodes and processes per node for a job.
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