CPU & Memory Utilization

[unixguy_1]

How to check the CPU utilization and Memory Utilization?

Pls guide me the tasks in Command oriented.

Thanks in advance.

[Duncan Edmonstone]

a good starting point are the commands sar and vmstat

so for example, sample CPU utilisation every 2 seconds for 10 iterations:

sar -u 2 10

or sample virtual memory utilisation every 2 seconds for 10 iterations:

vmstat 2 10

(look at the avm and free fields)
Note that vmstat reports memory in 4k pages so multiply by 4096 to get bytes.

HTH

Duncan

[rariasn]

He,

# top

rgs

[Sharma Sanjeev]

Hi

Please run Glance

Regards
Sanjeev

[點燃]

You can use glance.
Run glance and press 'c' for CPU report and press 'm' for memory report.

Top/sar are also very useful.

regards!

[Taifur]

Hi unixguy

YOu can check CPU and memory utilization by,

#top
#sar
#glance

For more details you can check sar:
======================================
In the first form above, sar samples cumulative activity counters in the operating system at n intervals of t seconds. If the -o option is specified, it saves the samples in file in binary format. The default value of n is 1. In the second form, with no sampling interval specified, sar extracts data from a previously recorded file, either the one specified by -f option or, by default, the standard system activity daily data file /var/adm/sa/sadd for the current day dd. The starting and ending times of the report can be bounded via the -s and -e time arguments of the form hh[:mm[:ss]]. The -i option selects records at sec-second intervals. Otherwise, all intervals found in the data file are reported.

In either case, subsets of data to be printed are specified by option:

-u
Report CPU utilization (the default); portion of time running in one of several modes. On a multi-processor system, if the -M option is used together with the -u option, per-CPU utilization as well as the average CPU utilization of all the active processors are reported. If the -M option is not used, only the average CPU utilization of all the active processors is reported. On a multi-processor ProcessorSet (pset) configured system, if the -P option is used together with the -M and -u options, the column for pset mapping to processor will be displayed before the cpu column.

pset
pset id (only on a multi-processor pset configured system with the -P , -M and -u option);

cpu
cpu number (only on a multi-processor system with the -M option);

%usr
user mode;

%sys
system mode;

%wio
idle with some process waiting for I/O (only block I/O, raw I/O, or VM pageins/swapins indicated);

%idle
otherwise idle.


-b
Report buffer activity:

bread/s
Number of physical reads per second from the disk (or other block devices) to the buffer cache;

bwrit/s
Number of physical writes per second from the buffer cache to the disk (or other block device);

lread/s
Number of reads per second from buffer cache;

lwrit/s
Number of writes per second to buffer cache;

%rcache
Buffer cache hit ratio for read requests e.g., 1 - bread/lread;

%wcache
Buffer cache hit ratio for write requests e.g., 1 - bwrit/lwrit;

pread/s
Number of reads per second from character device using the physio() (raw I/O) mechanism;

pwrit/s
Number of writes per second to character device using the physio() (i.e., raw I/O) mechanism; mechanism.


-d
Report activity for each block device, e.g., disk or tape drive. One line is printed for each device that had activity during the last interval. If no devices were active, a blank line is printed. Each line contains the following data:

device
Logical name of the device and its corresponding instance. Devices are categorized into the following device types:

disk3 - SCSI and NIO FL disks

sdisk - SCSI disks;


%busy
Portion of time device was busy servicing a request;

avque
Average number of requests outstanding for the device;

r+w/s
Number of data transfers per second (read and writes) from and to the device;

blks/s
Number of bytes transferred (in 512-byte units) from and to the device;

avwait
Average time (in milliseconds) that transfer requests waited idly on queue for the device;

avserv
Average time (in milliseconds) to service each transfer request (includes seek, rotational latency, and data transfer times) for the device.


-y
Report tty device activity:

rawch/s
Raw input characters per second;

canch/s
Input characters per second processed by canon();

outch/s
Output characters per second;

rcvin/s
Receive incoming character interrupts per second;

xmtin/s
Transmit outgoing character interrupts per second;

mdmin/s
Modem interrupt rate (not supported; always 0).


-c
Report system calls:

scall/s
Number of system calls of all types per second;

sread/s
Number of read() and/or readv() system calls per second;

swrit/s
Number of write() and/or writev() system calls per second;

fork/s
Number of fork() and/or vfork() system calls per second;

exec/s
Number of exec() system calls per second;

rchar/s
Number of characters transferred by read system calls block devices only) per second;

wchar/s
Number of characters transferred by write system calls (block devices only) per second.
-w
Report system swapping and switching activity:

swpin/s
Number of process swapins per second;

swpot/s
Number of process swapouts per second;

bswin/s
Number of 512-byte units transferred for swapins per second;

bswot/s
Number of 512-byte units transferred for swapouts per second;

pswch/s
Number of process context switches per second.


-a
Report use of file access system routines:

iget/s
Number of file system iget() calls per second;

namei/s
Number of file system lookuppn() (pathname translation) calls per second;

dirblk/s
Number of file system blocks read per second doing directory lookup.


-q
Report average queue length while occupied, and percent of time occupied. On a multi-processor machine, if the -M option is used together with the -q option, the per-CPU run queue as well as the average run queue of all the active processors are reported. If the -M option is not used, only the average run queue information of all the active processors is reported. In a multi-processor pset configured system if the -M option is used with the option -P then pset column will will be displayed before cpu column:

pset
pset id (only on a multi-processor and pset configured system, used with -P , -M and -q option)

cpu
cpu number (only on a multi-processor system and used with the -M option)

runq-sz
Average length of the run queue(s) of processes (in memory and runnable);

%runocc
The percentage of time the run queue(s) were occupied by processes (in memory and runnable);

swpq-sz
Average length of the swap queue of runnable processes (processes swapped out but ready to run). This column will not be displayed when -p option is used to display a particular ProcessorSet (pset) information in a pset configured system.

%swpocc
The percentage of time the swap queue of runnable processes (processes swapped out but ready to run) was occupied. This column will not be displayed when -p option is used to display a particular ProcessorSet (pset) information in a pset configured system.


-v
Report status of text, process, inode and file tables:

text-sz
(Not Applicable);

proc-sz
The current-size and maximum-size of the process table;

inod-sz
The current-size and maximum-size of the inode table (inode cache);

file-sz
The current-size and maximum-size of the system file table;

text-ov
(Not Applicable);

proc-ov
The number of times the process table overflowed (number of times the kernel could not find any available process table entries) between sample points;

inod-ov
The number of times the inode table (inode cache) overflowed (number of times the kernel could not find any available inode table entries) between sample points;

file-ov
The number of times the system file table overflowed (number of times the kernel could not find any available file table entries) between sample points.


-m
Report message and semaphore activities:

msg/s
Number of System V msgrcv() calls per second;

sema/s
Number of System V semop() calls per second;

select/s
Number of System V select() calls per second. This value will only be reported if the "-S" option is also explicitly specified.


-p
Report the specified ProcessorSet (pset) information. This option should be used with -u or -q option.

-A
Report all data. Equivalent to -udqbwcayvm.

-M
Report the per-processor data on a multi-processor system when used with -q and/or -u options. If the -M option is not used on a multi-processor system, the output format of the -u and -q options is the same as the uni-processor output format and the data reported is the average value of all the active processors.

-P
Report ProcessorSet (pset) information, mapping to the processor in the system or the specified pset. This option can only be used with -M and -q, or -M and -u options. It can also be combined with -p option to display information for a particular pset. If system is not pset configured it will display a warning message.


EXAMPLES
Watch CPU activity evolve for 5 seconds:

sar 1 5 Watch CPU activity evolve for 10 minutes and save data:

sar -o temp 60 10 Review disk and tape activity from that period later:

sar -d -f temp Review cpu utilization on a multi-processor system later:

sar -u -M -f temp WARNINGS
Users of sar must not rely on the exact field widths and spacing of its output, as these will vary depending on the system, the release of HP-UX, and the data to be displayed.


The link as follows:

http://docs.hp.com/en/B2355-60127/sar.1M.html

Rgds//
Taifur

[Avinash20]

"CPU utilization and Memory Utilization?"

CPU Utilization:

Check top and sar -Mu 1 1

Also have the %idle high

Memory Utilization:

# top

Check the memory section for XXXX K free

This is the free memory available on the server

# vmstat 1 1

Check the po(page-out) section.
It should always be zero.
If high then swapping is taking place due to less free memory available on the server.

[Dennis Handly]

>Taifur: For more details you can check sar:

Instead of providing the massive man page entry, please summarize it and then give your URL.