NAMEpmem - report per-process memory usage
SYNOPSISpmem [-a archive] [-h host] [-n pmnsfile] [-S starttime] [-u username]
[-w] [-z] [-Z timezone]
DESCRIPTIONpmem reports per-process memory usage statistics within the Performance
Co-Pilot framework. Both virtual size and pro-rated physical memory
usage are reported.
Unless directed to another host by the -h option, pmem will contact the
PMCD (see pmcd(1)) on the local host to obtain the required information.
Alternatively, the -a option may be used to obtain the required
information from an archive (see pmlogger(1)). If the -a option is used,
then the -S option may be used to specify the temporal position relative
to the start of the archive in seconds.
The -u option restricts the report to the specified username on the
target host or archive. Normally the report is truncated at the 80th
column. This is over-ridden with the -w option.
By default, pmem reports the time of day according to the local timezone
on the system where pmem is run. The -Z option changes the timezone to
timezone in the format of the environment variable TZ as described in
environ(5). The -z option changes the timezone to the local timezone at
the host that is the source of the performance metrics, as identified via
either the -h or -a options.
Normally pmem operates on the default Performance Metrics Namespace
(PMNS), however if the -n option is specified an alternative namespace is
loaded from the file pmnsfile.
If the PCP product is installed, then the tools psmon(1) and
mkpmemarch(1) are available to assist in the creation of PCP archives
that can be replayed with pmem(1).
REPORT FORMAT
In the report, all sizes are reported in Kbytes unless shown with a
suffix of M, in which case the size is Mbytes (multiples of 1048576
bytes), or a suffix of G, in which case the size is Gbytes (multiples of
1073741824 bytes). The virtual memory usage statistics represent the
total virtual size of each process, irrespective of how many pages are
valid (resident). The physical memory statistics indicate real memory
usage (only valid pages are counted) and are pro-rated on a per-page
basis between all processes which reference each page.
The columns in the report should be interpreted as follows:
pid Process ID.
ppid Parent process ID.
username User name of process owner.
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PMEM(1)PMEM(1)
vtxt Total virtual memory used by text (executable code) regions
mapped by the process.
ptxt Pro-rated physical memory used by text regions.
vdat Total virtual memory used by all non-executable regions,
excluding shared memory regions. This includes initialized
data, bss and stack but not shared memory regions.
pdat Pro-rated physical memory used by all data regions (data, bss
and stack but not shared memory regions).
vshm Total virtual memory used by all shared memory regions.
pshm Pro-rated physical memory used by shared memory regions.
command The command and arguments, truncated so each line in the report
is at most 80 columns (unless the -w option is given).
The report heading shows the amount of physical memory configured on the
target host and the amount of free memory, as reported by the operating
system (see the PCP metric mem.freemem).
Only memory used in user space is counted - memory used in kernel tables
such as that used for ptes (page table entries), and the proc and user
structures are not counted because they are allocated in the kernel's
address space.
If any shared memory segments are found with no process attachment, the
size of these are summed. If the total is more than 4096 bytes, then
this is reported as vshm belonging to a virtual process with a command of
``orphaned shmem'' and a pid of ``???''.
At the end of the report, a summary is printed indicating the totals for
each column and the grand totals. The difference between the total
physical memory in use by all processes and the total configured physical
memory will always be more than the free memory reported by the operating
system because the latter also accounts for memory allocated in the
kernels address space.
All statistics are accurate to within one 256th of a page.
FILES
$PCP_VAR_DIR/pmns/*
default PMNS specification files
PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the
file and directory names used by PCP. On each installation, the file
/etc/pcp.conf contains the local values for these variables. The
$PCP_CONF variable may be used to specify an alternative configuration
file, as described in pcp.conf(4).
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PMEM(1)PMEM(1)SEE ALSOmkpmemarch(1), pmcd(1), pmchart(1), pmdumplog(1), pminfo(1), pmlogger(1),
pmval(1) and sproc(2).
DIAGNOSTICS
All are generated on standard error and are intended to be self-
explanatory.
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