HP-UX Reference (11i v1 00/12) - 1M System Administration Commands N-Z (vol 4)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD

/build/1111/BRICK/man1m/naaagt.1m

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sar(1M) sar(1M)

NAME

sar - system activity reporter

SYNOPSIS

sar [-ubdycwaqvmAMS][-o ﬁle ] t [n]

sar [-ubdycwaqvmAMS][-s time ][-e time ][-i sec ][-f ﬁle ]

DESCRIPTION

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 utiliza-

tion 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 utilizationof all the active processors is reported:

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 andNIO 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 dev-

ice;

HP-UX Release 11i: December 2000 − 1 − Section 1M−−757

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