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numastat | SYNTAX | DESCRIPTION | OPTIONS | NOTES | ENVIRONMENT VARIABLES | FILES | EXAMPLES | AUTHORS | SEE ALSO | COLOPHON |
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numastat(8) Administration numastat(8)
numastat - Show per-NUMA-node memory statistics for processes and the
operating system
numastat
numastat [-V]
numastat [<PID>|<pattern>...]
numastat [-c] [-m] [-n] [-p <PID>|<pattern>] [-s[<node>]] [-v] [-z]
[<PID>|<pattern>...]
numastat with no command options or arguments at all, displays per-
node NUMA hit and miss system statistics from the kernel memory
allocator. This default numastat behavior is strictly compatible
with the previous long-standing numastat perl script, written by Andi
Kleen. The default numastat statistics shows per-node numbers (in
units of pages of memory) in these categories:
numa_hit is memory successfully allocated on this node as intended.
numa_miss is memory allocated on this node despite the process
preferring some different node. Each numa_miss has a numa_foreign on
another node.
numa_foreign is memory intended for this node, but actually allocated
on some different node. Each numa_foreign has a numa_miss on another
node.
interleave_hit is interleaved memory successfully allocated on this
node as intended.
local_node is memory allocated on this node while a process was
running on it.
other_node is memory allocated on this node while a process was
running on some other node.
Any supplied options or arguments with the numastat command will
significantly change both the content and the format of the display.
Specified options will cause display units to change to megabytes of
memory, and will change other specific behaviors of numastat as
described below.
-c Minimize table display width by dynamically shrinking column
widths based on data contents. With this option, amounts of
memory will be rounded to the nearest megabyte (rather than
the usual display with two decimal places). Column width and
inter-column spacing will be somewhat unpredictable with this
option, but the more dense display will be very useful on
systems with many NUMA nodes.
-m Show the meminfo-like system-wide memory usage information.
This option produces a per-node breakdown of memory usage
information similar to that found in /proc/meminfo.
-n Show the original numastat statistics info. This will show
the same information as the default numastat behavior but the
units will be megabytes of memory, and there will be other
formatting and layout changes versus the original numastat
behavior.
-p <PID> or <pattern>
Show per-node memory allocation information for the specified
PID or pattern. If the -p argument is only digits, it is
assumed to be a numerical PID. If the argument characters are
not only digits, it is assumed to be a text fragment pattern
to search for in process command lines. For example, numastat
-p qemu will attempt to find and show information for
processes with "qemu" in the command line. Any command line
arguments remaining after numastat option flag processing is
completed, are assumed to be additional <PID> or <pattern>
process specifiers. In this sense, the -p option flag is
optional: numastat qemu is equivalent to numastat -p qemu
-s[<node>]
Sort the table data in descending order before displaying it,
so the biggest memory consumers are listed first. With no
specified <node>, the table will be sorted by the total
column. If the optional <node> argument is supplied, the data
will be sorted by the <node> column. Note that <node> must
follow the -s immediately with no intermediate white space
(e.g., numastat -s2). Because -s can allow an optional
argument, it must always be the last option character in a
compound option character string. For example, instead of
numastat -msc (which probably will not work as you expect),
use numastat -mcs
-v Make some reports more verbose. In particular, process
information for multiple processes will display detailed
information for each process. Normally when per-node
information for multiple processes is displayed, only the
total lines are shown.
-V Display numastat version information and exit.
-z Skip display of table rows and columns of only zero valuess.
This can be used to greatly reduce the amount of uninteresting
zero data on systems with many NUMA nodes. Note that when
rows or columns of zeros are still displayed with this option,
that probably means there is at least one value in the row or
column that is actually non-zero, but rounded to zero for
display.
numastat attempts to fold each table display so it will be
conveniently readable on the output terminal. Normally a terminal
width of 80 characters is assumed. When the resize command is
available, numastat attempts to dynamically determine and fine tune
the output tty width from resize output. If numastat output is not
to a tty, very long output lines can be produced, depending on how
many NUMA nodes are present. In all cases, output width can be
explicitly specified via the NUMASTAT_WIDTH environment variable.
For example, NUMASTAT_WIDTH=100 numastat. On systems with many NUMA
nodes, numastat -c -z .... can be very helpful to selectively reduce
the amount of displayed information.
NUMASTAT_WIDTH
/proc/*/numa_maps
/sys/devices/system/node/node*/meminfo
/sys/devices/system/node/node*/numastat
numastat -c -z -m -n
numastat -czs libvirt kvm qemu
watch -n1 numastat
watch -n1 --differences=cumulative numastat
The original numastat perl script was written circa 2003 by Andi
Kleen <andi.kleen@intel.com>. The current numastat program was
written in 2012 by Bill Gray <bgray@redhat.com> to be compatible by
default with the original, and to add options to display per-node
system memory usage and per-node process memory allocation.
numactl(8), set_mempolicy(2), numa(3)
This page is part of the numactl (NUMA commands) project.
Information about the project can be found at
⟨http://oss.sgi.com/projects/libnuma/⟩. If you have a bug report for
this manual page, send it to linux-numa@vger.kernel.org. This page
was obtained from the project's upstream Git repository
⟨https://github.com/numactl/numactl.git⟩ on 2018-02-02. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2018-02-01.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
Bill Gray 1.0.0 numastat(8)
Pages that refer to this page: migrate_pages(2), move_pages(2)
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