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NAME | SYNOPSIS | DESCRIPTION | PCP ATOPSAR OPTIONS | OUTPUT DESCRIPTION | EXAMPLES | FILES | PCP ENVIRONMENT | DEBUGGING OPTIONS | SEE ALSO | COLOPHON |
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PCP-ATOPSAR(1) General Commands Manual PCP-ATOPSAR(1)
pcp-atopsar - Advanced System Activity Report (pcp-atop related)
pcp [pcp options] atopsar [atop options] [-r file|date] [-h host]
[-R cnt] [-b [YYYMMDD]hh:mm[ss]] [-e [YYYMMDD]hh:mm[ss]]
pcp [pcp options] atopsar [atop options] interval [samples]
The pcp-atopsar program can be used to report statistics at the
system level.
In the first synopsis line (no sampling interval specified), pcp-
atopsar extracts data from a raw logfile that has been recorded
previously by pmlogger(1) (or via the -w option of the pcp-atop
program).
You can specify the name of the logfile with the -r option of the
pcp-atopsar program. When a pmlogger daily logfile is used, named
$PCP_LOG_DIR/pmlogger/[host]/YYYYMMDD (where YYYYMMDD reflects the
date), the required date of the form YYYYMMDD can be specified
with the -r option instead of the filename, or the symbolic name
'y' can be used for yesterday's daily logfile (this can be
repeated so 'yyyy' indicates the logfile of four days ago). If
the -r option is not specified at all, today's daily logfile is
used by default.
By default, the hostname of the localhost will be used when
resolving pmlogger archives, however an alternative host can be
specified using the -h option.
The starting and ending times of the report can be defined using
the options -b and -e followed by a time argument of the form
[YYYYMMDD]hh:mm[ss].
In the second synopsis line, pcp-atopsar reads actual activity
counters from the kernel with the specified interval (in seconds)
and the specified number of samples (optionally). When pcp-
atopsar is activated in this way it immediately sends the output
for every requested report to standard output. If only one type
of report is requested, the header is printed once and after every
interval seconds the statistical counters are shown for that
period. If several reports are requested, a header is printed per
sample followed by the statistical counters for that period.
When invoked via the pcp(1) command, the PCPIntro(1) options
-h/--host, -a/--archive, -O/--origin, -s/--samples, -t/--interval,
-Z/--timezone and several other pcp options become indirectly
available, see PCPIntro(1) for their descriptions.
Some generic flags can be specified to influence the behaviour of
the pcp-atopsar program:
-S By default the timestamp at the beginning of a line is
suppressed if more lines are shown for one interval. With
this flag a timestamp is given for every output-line (easier
for post-processing).
-a By default certain resources as disks and network interfaces
are only shown when they were active during the interval.
With this flag all resources of a given type are shown, even
if they were inactive during the interval.
-x By default pcp-atopsar only uses colors if output is directed
to a terminal (window). These colors might indicate that a
critical occupation percentage has been reached (red) or has
been almost reached (cyan) for a particular resource. See
the man-page of atop for a detailed description of this
feature (section COLORS).
With the flag -x the use of colors is suppressed
unconditionally.
-C By default pcp-atopsar only uses colors if output is directed
to a terminal (window). These colors might indicate that a
critical occupation percentage has been reached (red) or has
been almost reached (cyan) for a particular resource. See
the man-page of atop for a detailed description of this
feature (section COLORS).
With the flag -C colors will always be used, even if output
is not directed to a terminal.
-M Use markers at the end of a line to indicate that a critical
occupation percentage has been reached ('*') or has been
almost reached ('+') for particular resources. The marker '*'
is similar to the color red and the marker '+' to the color
cyan. See the man-page of atop for a detailed description of
these colors (section COLORS).
-H Repeat the header line within a report for every N detail
lines. The value of N is determined dynamically in case of
output to a tty/window (depending on the number of lines);
for output to a file or pipe this value is 23.
-R Summarize cnt samples into one sample. When the logfile
contains e.g. samples of 10 minutes, the use of the flag '-R
6' shows a report with one sample for every hour.
Other flags are used to define which reports are required:
-A Show all possible reports.
-c Report about CPU utilization (in total and per cpu).
-g Report about GPU utilization (per GPU).
-p Report about processor-related matters, like load-averages
and hardware interrupts.
-P Report about processes.
-m Current memory- and swap-occupation.
-s Report about paging- and swapping-activity, and
overcommitment.
-B Report about Pressure Stall Information (PSI).
-l Report about utilization of logical volumes.
-f Report about utilization of multiple devices.
-d Report about utilization of disks.
-n Report about NFS mounted filesystems on NFS client.
-j Report about NFS client activity.
-J Report about NFS server activity.
-i Report about the network interfaces.
-I Report about errors for network-interfaces.
-w Report about IP version 4 network traffic.
-W Report about errors for IP version 4 traffic.
-y General report about ICMP version 4 layer activity.
-Y Per-type report about ICMP version 4 layer activity.
-u Report about UDP version 4 network traffic.
-z Report about IP version 6 network traffic.
-Z Report about errors for IP version 6 traffic.
-k General report about ICMP version 6 layer activity.
-K Per-type report about ICMP version 6 layer activity.
-U Report about UDP version 6 network traffic.
-t Report about TCP network traffic.
-T Report about errors for TCP-traffic.
-h Report about Infiniband utilization.
-O Report about top-3 processes consuming most processor
capacity. This report is only available when using a log
file (not when specifying an interval).
-G Report about top-3 processes consuming most resident memory.
This report is only available when using a log file (not when
specifying an interval).
-D Report about top-3 processes issuing most disk transfers.
This report is only available when using a log file (not when
specifying an interval).
-N Report about top-3 processes issuing most IPv4/IPv6 socket
transfers. This report is only available when using a log
file (not when specifying an interval).
The following additional PCP command line long options are also
available:
--align=align
Force the initial sample to be aligned on the boundary of a
natural time unit align. Refer to PCPIntro(1) for a complete
description of the syntax for align.
--archive=archive
Performance metric values are retrieved from the set of
Performance Co-Pilot (PCP) archive files identified by the
argument archive, which is a comma-separated list of names,
each of which may be the base name of an archive or the name
of a directory containing one or more archives.
--finish=endtime
When reporting archived metrics, the report will be
restricted to those records logged before or at endtime.
Refer to PCPIntro(1) for a complete description of the syntax
for endtime.
--host=host
Fetch performance metrics from pmcd(1) on host, rather than
from the default localhost.
--hostzone
Use the local timezone of the host that is the source of the
performance metrics, as identified by either the --host or
the --archive options. The default is to use the timezone of
the local host.
--hotproc
Use the pmdaproc(1) hotproc metrics.
--interval=interval
Set the reporting interval to something other than the
default 1 second. The interval argument follows the syntax
described in PCPIntro(1), and in the simplest form may be an
unsigned integer (the implied units in this case are
seconds).
--samples=samples
The samples option defines the number of samples to be
retrieved and reported.
--start=starttime
When reporting archived metrics, the report will be
restricted to those records logged at or after starttime.
Refer to PCPIntro(1) for a complete description of the syntax
for starttime.
--timezone=timezone
Use timezone for the date and time. Timezone is in the
format of the environment variable TZ as described in
environ(7).
--version
Display version number and exit.
Depending on the requested report, a number of columns with output
values are produced. The values are mostly presented as a number
of events per second.
The output for the flag -c contains the following columns per cpu:
usr% Percentage of cpu-time consumed in user mode (program text)
for all active processes running with a nice value of zero
(default) or a negative nice value (which means a higher
priority than usual). The cpu consumption in user mode of
processes with a nice value larger than zero (lower
priority) is indicated in the nice%-column.
nice% Percentage of cpu time consumed in user mode (i.e. program
text) for all processes running witn a nice value larger
than zero (which means with a lower priority than average).
sys% Percentage of cpu time consumed in system mode (kernel
text) for all active processes. A high percentage usually
indicates a lot of system calls being issued.
irq% Percentage of cpu time consumed for handling of device
interrupts.
softirq%
Percentage of cpu time consumed for soft interrupt
handling.
steal% Percentage of cpu time stolen by other virtual machines
running on the same hardware.
guest% Percentage of cpu time used by other virtual machines
running on the same hardware (overlaps with usr%/nice%).
wait% Percentage of unused cpu time while at least one of the
processes in wait-state awaits completion of disk I/O.
idle% Percentage of unused cpu time because all processes are in
a wait-state but not waiting for disk-I/O.
The output for the flag -g contains the following columns per GPU:
busaddr
GPU number and bus-ID (separated by '/').
gpubusy
GPU busy percentage during interval.
membusy
GPU memory busy percentage during interval, i.e. time to
issue read and write accesses on memory.
memocc Percentage of memory occupation at this moment.
memtot Total memory available.
memuse Used GPU memory at this moment.
gputype
Type of GPU.
The output for the flag -p contains the following values:
pswch/s
Number of process switches (also called context switches)
per second on this cpu. A process switch occurs at the
moment that an active thread (i.e. the thread using a cpu)
enters a wait state or has used its time slice completely;
another thread will then be chosen to use the cpu.
devintr/s
Number of hardware interrupts handled per second on this
cpu.
clones/s
The number of new threads started per second.
loadavg1
Load average reflecting the average number of threads in
the runqueue or in non-interruptible wait state (usually
waiting for disk or tape I/O) during the last minute.
loadavg5
Load average reflecting the average number of threads in
the runqueue or in non-interruptible wait state (usually
waiting for disk or tape I/O) during the last 5 minutes.
loadavg15
Load average reflecting the average number of threads in
the runqueue or in non-interruptible wait state (usually
waiting for disk or tape I/O) during the last 15 minutes.
The output for the flag -P contains information about the
processes and threads:
clones/s
The number of new threads started per second.
pexit/s
curproc
Total number of processes present in the system.
curzomb
Number of zombie processes present in the system.
trun Total number of threads present in the system in state
'running'.
tslpi Total number of threads present in the system in state
'interruptible sleeping'.
tslpu Total number of threads present in the system in state
'uninterruptible sleeping'.
tidle Total number of threads present in the system in state
'idle' (uninterruptible sleeping but not counted in the
load average).
The output for the flag -m contains information about the memory-
and swap-utilization:
memtotal
Total usable main memory size.
memfree
Available main memory size at this moment (snapshot).
buffers
Main memory used at this moment to cache metadata-blocks
(snapshot).
cached Main memory used at this moment to cache data-blocks
(snapshot).
dirty Amount of memory in the page cache that still has to be
flushed to disk at this moment (snapshot).
slabmem
Main memory used at this moment for dynamically allocated
memory by the kernel (snapshot).
swptotal
Total swap space size at this moment (snapshot).
swpfree
Available swap space at this moment (snapshot).
The output for the flag -s contains information about the
frequency of swapping:
pagescan/s
Number of scanned pages per second due to the fact that
free memory drops below a particular threshold.
swapin/s
The number of memory-pages the system read from the swap-
device per second.
swapout/s
The number of memory-pages the system wrote to the swap-
device per second.
oomkill
The number of processes being killed during the last
interval due to lack of memory/swap. The value -1 means
that this counter is not supported by the current kernel
version.
commitspc
The committed virtual memory space i.e. the reserved
virtual space for all allocations of private memory space
for processes.
commitlim
The maximum limit for the committed space, which is by
default swap size plus 50% of memory size. The kernel only
verifies whether the committed space exceeds the limit if
strict overcommit handling is configured
(vm.overcommit_memory is 2).
The output for the flag -B contains the Pressure Stall Information
(PSI):
cpusome
Average pressure percentage during the interval for the
category 'CPU some'.
memsome
Average pressure percentage during the interval for the
category 'memory some'.
memfull
Average pressure percentage during the interval for the
category 'memory full'.
iosome Average pressure percentage during the interval for the
category 'I/O some'.
iofull Average pressure percentage during the interval for the
category 'I/O full'.
The output for the flags -l (LVM), -f (MD), and -d (hard disk)
contains the following columns per active unit:
disk Name.
busy Busy-percentage of the unit (i.e. the portion of time that
the device was busy handling requests).
read/s Number of read-requests issued per second on this unit.
KB/read
Average number of Kbytes transferred per read-request for
this unit.
writ/s Number of write-requests (including discard requests)
issued per second on this unit.
KB/writ
Average number of Kbytes transferred per write-request for
this unit.
avque Average number of requests outstanding in the queue during
the time that the unit is busy.
avserv Average number of milliseconds needed by a request on this
unit (seek, latency and data-transfer).
The output for the flag -n contains information about activity on
NFS mounted filesystems (client):
mounted_device
Mounted device containing server name and server directory
being mounted.
physread/s
Kilobytes data physically read from the NFS server by
processes running on the NFS client.
KBwrite/s
Kilobytes data physically written to the NFS server by
processes running on the NFS client.
When the NFS filesystem was mounted during the interval,
the state 'M' is shown.
The output for the flag -j contains information about NFS client
activity:
rpc/s Number of RPC calls per second issued to NFS server(s).
rpcread/s
Number of read RPC calls per second issued to NFS
server(s).
rpcwrite/s
Number of write RPC calls per second issued to NFS
server(s).
retrans/s
Number of retransmitted RPC calls per second.
autrefresh/s
Number of authorization refreshes per second.
The output for the flag -J contains information about NFS server
activity:
rpc/s Number of RPC calls per second received from NFS client(s).
rpcread/s
Number of read RPC calls per second received from NFS
client(s).
rpcwrite/s
Number of write RPC calls per second received from NFS
client(s).
MBcr/s Number of Megabytes per second returned to read requests by
clients.
MBcw/s Number of Megabytes per second passed in write requests by
clients.
nettcp/s
Number of requests per second handled via TCP.
netudp/s
Number of requests per second handled via UDP.
The output for the flag -i provides information about utilization
of network interfaces:
interf Name of interface.
busy Busy percentage for this interface. If the linespeed of
this interface could not be determined (e.g. for virtual
interfaces), a question mark is shown.
ipack/s
Number of packets received from this interface per second.
opack/s
Number of packets transmitted to this interface per second.
iKbyte/s
Number of Kbytes received from this interface per second.
oKbyte/s
Number of Kbytes transmitted via this interface per second.
imbps/s
Effective number of megabits received per second.
ombps/s
Effective number of megabits transmitted per second.
maxmbps/s
Linespeed as number of megabits per second. If the
linespeed could not be determined (e.g. virtual
interfaces), value 0 is shown.
The linespeed is followed by the indication 'f' (full
duplex) or 'h' (half duplex).
The output for the flag -I provides information about the failures
that were detected for network interfaces:
interf Name of interface.
ierr/s Number of bad packets received from this interface per
second.
oerr/s Number of times that packet transmission to this interface
failed per second.
coll/s Number of collisions encountered per second while
transmitting packets.
idrop/s
Number of received packets dropped per second due to lack
of buffer-space in the local system.
odrop/s
Number of transmitted packets dropped per second due to
lack of buffer-space in the local system.
iframe/s
Number of frame alignment-errors encountered per second on
received packets.
ocarrier/s
Number of carrier-errors encountered per second on
transmitted packets.
The output for the flag -w provides information about the
utilization of the IPv4-layer (formal SNMP-names between
brackets):
inrecv/s
Number of IP datagrams received from interfaces per second,
including those received in error (ipInReceives).
outreq/s
Number of IP datagrams that local higher-layer protocols
supplied to IP in requests for transmission per second
(ipOutRequests).
indeliver/s
Number of received IP datagrams that have been successfully
delivered to higher protocol-layers per second
(ipInDelivers).
forward/s
Number of received IP datagrams per second for which this
entity was not their final IP destination, as a result of
which an attempt was made to forward (ipForwDatagrams).
reasmok/s
Number of IP datagrams successfully reassembled per second
(ipReasmOKs).
fragcreat/s
Number of IP datagram fragments generated per second at
this entity (ipFragCreates).
The output for the flag -W provides information about the failures
that were detected in the IPv4-layer (formal SNMP-names between
brackets):
in: dsc/s
Number of input IP datagrams per second for which no
problems were encountered to prevent their continued
processing but that were discarded, e.g. for lack of buffer
space (ipInDiscards).
in: hder/s
Number of input IP datagrams per second discarded due to
errors in the IP header (ipInHdrErrors).
in: ader/s
Number of input IP datagrams per second discarded because
the IP address in the destination field was not valid to be
received by this entity (ipInAddrErrors).
in: unkp/s
Number of inbound packets per second that were discarded
because of an unknown or unsupported protocol
(ipInUnknownProtos).
in: ratim/s
Number of timeout-situations per second while other
fragments were expected for successful reassembly
(ipReasmTimeout).
in: rfail/s
Number of failures detected per second by the IP reassembly
algorithm (ipReasmFails).
out: dsc/s
Number of output IP datagrams per second for which no
problems were encountered to prevent their continued
processing but that were discarded, e.g. for lack of buffer
space (ipOutDiscards).
out: nrt/s
Number of IP datagrams per second discarded because no
route could be found (ipOutNoRoutes).
The output for the flag -y provides information about the general
utilization of the ICMPv4-layer and some information per type of
ICMP-message (formal SNMP-names between brackets):
intot/s
Number of ICMP messages (any type) received per second at
this entity (icmpInMsgs).
outtot/s
Number of ICMP messages (any type) transmitted per second
from this entity (icmpOutMsgs).
inecho/s
Number of ICMP Echo (request) messages received per second
(icmpInEchos).
inerep/s
Number of ICMP Echo-Reply messages received per second
(icmpInEchoReps).
otecho/s
Number of ICMP Echo (request) messages transmitted per
second (icmpOutEchos).
oterep/s
Number of ICMP Echo-Reply messages transmitted per second
(icmpOutEchoReps).
The output for the flag -Y provides information about other types
of ICMPv4-messages (formal SNMP-names between brackets):
ierr/s Number of ICMP messages received per second but determined
to have ICMP-specific errors (icmpInErrors).
isq/s Number of ICMP Source Quench messages received per second
(icmpInSrcQuenchs).
ird/s Number of ICMP Redirect messages received per second
(icmpInRedirects).
idu/s Number of ICMP Destination Unreachable messages received
per second (icmpInDestUnreachs).
ite/s Number of ICMP Time Exceeded messages received per second
(icmpOutTimeExcds).
oerr/s Number of ICMP messages transmitted per second but
determined to have ICMP-specific errors (icmpOutErrors).
osq/s Number of ICMP Source Quench messages transmitted per
second (icmpOutSrcQuenchs).
ord/s Number of ICMP Redirect messages transmitted per second
(icmpOutRedirects).
odu/s Number of ICMP Destination Unreachable messages transmitted
per second (icmpOutDestUnreachs).
ote/s Number of ICMP Time Exceeded messages transmitted per
second (icmpOutTimeExcds).
The output for the flag -u provides information about the
utilization of the UDPv4-layer (formal SNMP-names between
brackets):
indgram/s
Number of UDP datagrams per second delivered to UDP users
(udpInDatagrams).
outdgram/s
Number of UDP datagrams transmitted per second from this
entity (udpOutDatagrams).
inerr/s
Number of received UDP datagrams per second that could not
be delivered for reasons other than the lack of an
application at the destination port (udpInErrors).
noport/s
Number of received UDP datagrams per second for which there
was no application at the destination port (udpNoPorts).
The output for the flag -z provides information about the
utilization of the IPv6-layer (formal SNMP-names between
brackets):
inrecv/s
Number of input IPv6-datagrams received from interfaces per
second, including those received in error
(ipv6IfStatsInReceives).
outreq/s
Number of IPv6-datagrams per second that local higher-layer
protocols supplied to IP in requests for transmission
(ipv6IfStatsOutRequests). This counter does not include
any forwarded datagrams.
inmc/s Number of multicast packets per second that have been
received by the interface (ipv6IfStatsInMcastPkts).
outmc/s
Number of multicast packets per second that have been
transmitted to the interface (ipv6IfStatsOutMcastPkts).
indeliv/s
Number of IP datagrams successfully delivered per second to
IPv6 user-protocols, including ICMP
(ipv6IfStatsInDelivers).
reasmok/s
Number of IPv6 datagrams successfully reassembled per
second (ipv6IfStatsReasmOKs).
fragcre/s
Number of IPv6 datagram fragments generated per second at
this entity (ipv6IfStatsOutFragCreates).
The output for the flag -Z provides information about the failures
that were detected in the IPv6-layer (formal SNMP-names between
brackets):
in: dsc/s
Number of input IPv6 datagrams per second for which no
problems were encountered to prevent their continued
processing but that were discarded, e.g. for lack of buffer
space (ipv6IfStatsInDiscards).
in: hder/s
Number of input datagrams per second discarded due to
errors in the IPv6 header (ipv6IfStatsInHdrErrors).
in: ader/s
Number of input datagrams per second discarded because the
IPv6 address in the destination field was not valid to be
received by this entity (ipv6IfStatsInAddrErrors).
in: unkp/s
Number of locally-addressed datagrams per second that were
discarded because of an unknown or unsupported protocol
(ipv6IfStatsInUnknownProtos).
in: ratim/s
Number of timeout-situations per second while other IPv6
fragments were expected for successful reassembly
(ipv6ReasmTimeout).
in: rfail/s
Number of failures detected per second by the IPv6
reassembly-algorithm (ipv6IfStatsReasmFails).
out: dsc/s
Number of output IPv6 datagrams per second for which no
problems were encountered to prevent their continued
processing but that were discarded, e.g. for lack of buffer
space (ipv6IfStatsOutDiscards).
out: nrt/s
Number of IPv6 datagrams per second discarded because no
route could be found (ipv6IfStatsInNoRoutes).
The output for the flag -k provides information about the general
utilization of the ICMPv6-layer and some information per type of
ICMP-message (formal SNMP-names between brackets):
intot/s
Number of ICMPv6 messages (any type) received per second at
the interface (ipv6IfIcmpInMsgs).
outtot/s
Number of ICMPv6 messages (any type) transmitted per second
from this entity (ipv6IfIcmpOutMsgs).
inerr/s
Number of ICMPv6 messages received per second that had
ICMP-specific errors, such as bad ICMP checksums, bad
length, etc (ipv6IfIcmpInErrors).
innsol/s
Number of ICMP Neighbor Solicit messages received per
second (ipv6IfIcmpInNeighborSolicits).
innadv/s
Number of ICMP Neighbor Advertisement messages received per
second (ipv6IfIcmpInNeighborAdvertisements).
otnsol/s
Number of ICMP Neighbor Solicit messages transmitted per
second (ipv6IfIcmpOutNeighborSolicits).
otnadv/s
Number of ICMP Neighbor Advertisement messages transmitted
per second (ipv6IfIcmpOutNeighborAdvertisements).
The output for the flag -K provides information about other types
of ICMPv6-messages (formal SNMP-names between brackets):
iecho/s
Number of ICMP Echo (request) messages received per second
(ipv6IfIcmpInEchos).
ierep/s
Number of ICMP Echo-Reply messages received per second
(ipv6IfIcmpInEchoReplies).
oerep/s
Number of ICMP Echo-Reply messages transmitted per second
(ipv6IfIcmpOutEchoReplies).
idu/s Number of ICMP Destination Unreachable messages received
per second (ipv6IfIcmpInDestUnreachs).
odu/s Number of ICMP Destination Unreachable messages transmitted
per second (ipv6IfIcmpOutDestUnreachs).
ird/s Number of ICMP Redirect messages received per second
(ipv6IfIcmpInRedirects).
ord/s Number of ICMP Redirect messages transmitted per second
(ipv6IfIcmpOutRedirect).
ite/s Number of ICMP Time Exceeded messages received per second
(ipv6IfIcmpInTimeExcds).
ote/s Number of ICMP Time Exceeded messages transmitted per
second (ipv6IfIcmpOutTimeExcds).
The output for the flag -U provides information about the
utilization of the UDPv6-layer (formal SNMP-names between
brackets):
indgram/s
Number of UDPv6 datagrams per second delivered to UDP users
(udpInDatagrams),
outdgram/s
Number of UDPv6 datagrams transmitted per second from this
entity (udpOutDatagrams),
inerr/s
Number of received UDPv6 datagrams per second that could
not be delivered for reasons other than the lack of an
application at the destination port (udpInErrors).
noport/s
Number of received UDPv6 datagrams per second for which
there was no application at the destination port
(udpNoPorts).
The output for the flag -t provides information about the
utilization of the TCP-layer (formal SNMP-names between brackets):
insegs/s
Number of received segments per second, including those
received in error (tcpInSegs).
outsegs/s
Number of transmitted segments per second, excluding those
containing only retransmitted octets (tcpOutSegs).
actopen/s
Number of active opens per second that have been supported
by this entity (tcpActiveOpens).
pasopen/s
Number of passive opens per second that have been supported
by this entity (tcpPassiveOpens).
nowopen
Number of connections currently open (snapshot), for which
the state is either ESTABLISHED or CLOSE-WAIT
(tcpCurrEstab).
The output for the flag -T provides information about the failures
that were detected in the TCP-layer (formal SNMP-names between
brackets):
inerr/s
Number of received segments per second received in error
(tcpInErrs).
retrans/s
Number of retransmitted segments per second
(tcpRetransSegs).
attfail/s
Number of failed connection attempts per second that have
occurred at this entity (tcpAttemptFails).
estabreset/s
Number of resets per second that have occurred at this
entity (tcpEstabResets).
outreset/s
Number of transmitted segments per second containing the
RST flag (tcpOutRsts).
The output for the flag -h provides information about utilization
of Infiniband ports:
controller
Name of controller.
port Controller port.
busy Busy percentage for this port.
ipack/s
Number of packets received from this port per second.
opack/s
Number of packets transmitted to this port per second.
igbps/s
Effective number of gigabits received per second.
ogbps/s
Effective number of gigabits transmitted per second.
maxgbps/s
Maximum rate as number of gigabits per second.
lanes Number of lanes.
The output for the flag -O provides information about the top-3 of
processes with the highest processor consumption:
pid Process-id (if zero, the process has exited while the pid
could not be determined).
command
The name of the process.
cpu% The percentage of cpu-capacity being consumed. This value
can exceed 100% for a multithreaded process running on a
multiprocessor machine.
The output for the flag -G provides information about the top-3 of
processes with the highest memory consumption:
pid Process-id (if zero, the process has exited while the pid
could not be determined).
command
The name of the process.
mem% The percentage of resident memory-utilization by this
process.
The output for the flag -D provides information about the top-3 of
processes that issue the most read and write accesses to disk:
pid Process-id (if zero, the process has exited while the pid
could not be determined).
command
The name of the process.
dsk% The percentage of read and write accesses related to the
total number of read and write accesses issued on disk by
all processes, so a high percentage does not imply a high
disk load on system level.
The output for the flag -N provides information about the top-3 of
processes that issue the most socket transfers for IPv4/IPv6:
pid Process-id (if zero, the process has exited while the pid
could not be determined).
command
The name of the process.
net% The percentage of socket transfers related to the total
number of transfers issued by all processes, so a high
percentage does not imply a high network load on system
level.
To see today's cpu-activity so far (supposed that atop is logging
in the background):
pcp-atopsar
To see the memory occupation for June 5, 2018 between 10:00 and
12:30 (supposed that pmlogger has been logging daily in the
background on host acme.com):
pcp-atopsar -m -r $PCP_LOG_DIR/pmlogger/acme.com/20180605 -b
10:00 -e 12:30
or
pcp-atopsar -m -r 20180605 -b 10:00 -e 12:30
or, suppose it is June 8, 2018 at this moment
pcp-atopsar -m -r yyy -b 10:00 -e 12:30
Write a logfile with atop to record the system behaviour for 30
minutes (30 samples of one minute) and produce all available
reports afterwards:
pcp-atop -w /tmp/atoplog 60 30
pcp-atopsar -A -r /tmp/atoplog
To watch TCP activity evolve for ten minutes (10 samples with
sixty seconds interval):
pcp-atopsar -t 60 10
To watch the header-lines ('_' as last character) of all reports
with only the detail-lines showing critical resource consumption
(marker '*' or '+' as last character):
pcp-atopsar -AM | grep '[_*+]$'
/etc/atoprc
Configuration file containing system-wide default values
(mainly flags). See related man-page.
~/.atoprc
Configuration file containing personal default values (mainly
flags). See related man-page.
$PCP_LOG_DIR/pmlogger/HOST/YYYYMMDD
Daily data file, where YYYYMMDD are digits representing the
date, and HOST is the hostname of the machine being logged.
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(5).
For environment variables affecting PCP tools, see
pmGetOptions(3).
The -D or --debug pcp option enables the output of additional
diagnostics on stderr to help triage problems, although the
information is sometimes cryptic and primarily intended to provide
guidance for developers rather end-users. debug is a comma
separated list of debugging options; use pmdbg(1) with the -l
option to obtain a list of the available debugging options and
their meaning.
PCPIntro(1), pcp(1), pcp-atop(1), mkaf(1), pmlogger(1),
pmlogger_daily(1) and pcp-atoprc(5).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-11.) 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
Performance Co-Pilot PCP PCP-ATOPSAR(1)
Pages that refer to this page: pcp-atop(1), pcp-atoprc(5)
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