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Chapter 28. Profiling memory allocation with numastat

The numastat tool provides detailed statistics on memory allocations within a system, presenting data for each NUMA node individually. This information is valuable for analyzing system memory performance and evaluating the efficacy of various memory policies.

28.1. Default numastat statistics
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By default, the numastat tool displays statistics over these categories of data for each NUMA node:

numa_hit
The number of pages that were successfully allocated to this node.
numa_miss

The number of pages that were allocated on this node because of low memory on the intended node. Each numa_miss event has a corresponding numa_foreign event on another node.

Note

High numa_hit values and low numa_miss values (relative to each other) indicate optimal performance.

numa_foreign
The number of pages initially intended for this node that were allocated to another node instead. Each numa_foreign event has a corresponding numa_miss event on another node.
interleave_hit
The number of interleave policy pages successfully allocated to this node.
local_node
The number of pages successfully allocated on this node by a process on this node.
other_node
The number of pages allocated on this node by a process on another node.

28.2. Viewing memory allocation with numastat
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You can view the memory allocation of the system by using the numastat tool.

Prerequisites

  • You have installed the numactl package. 

    # dnf install numactl
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Procedure

  • View the memory allocation of your system: 

    $ numastat
                             node0         node1
numa_hit                  76557759      92126519
numa_miss                 30772308      30827638
numa_foreign              30827638      30772308
interleave_hit              106507        103832
local_node                76502227      92086995
other_node                30827840      30867162
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