Iostat manual

PCP-IOSTAT(1) General Commands Manual PCP-IOSTAT(1) NAME top pmiostat, pcp-iostat - report block I/O statistics SYNOPSIS top pcp [pcp options] iostat [-u?] [-G method] [-P precision] [-R pattern] [-x [dm][,t][,h][,noidle]] DESCRIPTION top pcp-iostat reports I/O statistics for SCSI (by default) or other devices (if the -x option is specified). IOSTAT(8) NetBSD System Manager's Manual IOSTAT(8) NAME iostat-- report I/O statistics SYNOPSIS iostat [-CdDITxy] [-c count] [-w wait] [drives] DESCRIPTION iostat displays kernel I/O statistics on terminal, disk and CPU opera- tions. IOSTAT(1) Linux User's Manual IOSTAT(1) NAME top iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.

The kernel also takes hi-res time stamps at queue entry and exit points, which allows it to keep track of the residence time and cumulative residence-length product for each queue. Using these values, iostat produces highly accurate measures of throughput, utilization, queue lengths, transaction rates and service time. For terminals collectively, the kernel simply counts the number of input and output characters. The columns in the pcp-iostat report have the following interpretation: Timestamp When the -x t option is specified, this column is the timestamp in ctime(3) format. Device Specifies the scsi device name, or if -x dm is specified, the device-mapper logical device name. Iostat displays kernel I/O statistics on terminal, device and cpu operations. The options are as follows: c Repeat the display count times. If no wait interval is specified, the default is 1 second.

27 ສ.ຫ. The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their. This includes the time spent by the requests in queue and the time spent servicing them. You can go through the iostat manual for more information regarding the. The above is the introduction of the MAN manual about the iostat command, very simple. iostat is a tool we often use to analyze CPU load and disk I / O.