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Chapter 30. Profiling memory allocation with numastat
With the numastat tool, you can display statistics over memory allocations in a system.
The numastat tool displays data for each NUMA node separately. You can use this information to investigate memory performance of your system or the effectiveness of different memory policies on your system.
30.1. 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_missevent has a correspondingnuma_foreignevent on another node. numa_foreign-
The number of pages initially intended for this node that were allocated to another node instead. Each
numa_foreignevent has a correspondingnuma_missevent 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.
Note
High numa_hit values and low numa_miss values (relative to each other) indicate optimal performance.
30.2. Viewing memory allocation with numastat
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You can view the memory allocation of the system by using the numastat tool.
Prerequisites
Install the
numactlpackage:yum install numactl
# yum install numactlCopy to Clipboard Copied! Toggle word wrap Toggle overflow
Procedure
View the memory allocation of your system:
Copy to Clipboard Copied! Toggle word wrap Toggle overflow
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