Meaning
Pid
Process ID
PPID
Parent Process ID
Ruser
Real User Name
Uid
User ID of the process owner
USER
User name of the process owner
GROUP
Group Name of Process owner
Tty
The terminal name of the startup process. Processes that are not started from the terminal are displayed as?
PR
Priority level
NI
Nice value. Negativ
information for the output is displayed only once for periodic cyclic output, delay is the latency between two outputs, and count refers to the number of times that the time interval is calculated. For vmstat output The meaning of each field, you can run the man Vmstat view.
Monitoring I/O subsystem conditions with Iostat
Iostat is an abbreviation for I/O statistics (input/output statistics), and the Iostat tool will monitor the system's disk operation activities. It is characterized by reporti
P
Last CPU used, only meaningful in multi-CPU environment
%cpu
CPU time consumption percentage last updated to current
Time
Total CPU time used by the process, in seconds
time+
Total CPU time used by the process, Unit 1/100 sec
%MEM
Percentage of physical memory used by the process
VIRT
The total amount of virtual memory used by the process, in
environment. %cpu use of the CPU. The percentage of CPU time that the task has elapsed since the last screen refresh, in total CPU time. Time of the CPU (in seconds). The total CPU time that the task has been using since it was started. When ' cumulative mode ' is on, each process lists the CPU time used by its and its dead child processes. Time+ CPU time, 1% seconds. Same as time but accurate to percentile. %MEM Memory Usage (RES). The amount of available physical memory that the task is curre
./dev/sdb1 /dataext3 defaults 0 Modify to the following configuration:/dev/sdb1 /dataext3 defaults,noatime,nodiratime 0 Then reboot the system to make it effective.Or do not restart the system, you can use the Remount option to re-mount:-->mount -o defaults,noatime,nodiratime -o remount /dev/sdb1 /sdb-->mount | grep sdb1/dev/sdb1 on /sdb type ext3 (rw,noatime,nodiratime)If it is a separately mounted partition or disk, you can execute the command directly:-->mount -o defaul
refreshes and outputs once every 3 seconds, 3 times after the program exitsPidstat-p 1 2 3-l07:18:58 AM PID%usr%system%guest%cpu CPU Command07:18:59 AM 1 0.00 0.00 0.00 0.00 0/sbin/init07:19:00 AM 1 0.00 0.00 0.00 0.00 0/sbin/init07:19:01 AM 1 0.00 0.00 0.00 0.00 0/sbin/initAverage:1 0.00 0.00 0.00 0.00-/sbin/init%USR: The CPU usage of the process in the user state.%system: CPU utilization of the process at the kernel state (System level).%CPU: The total CPU utilization of the process, if in SM
the DIRECTORY parameter.-Y [kilobytes] starts the sort command with the number of kilobytes of the primary storage specified by the kilobytes parameter, and increases the storage capacity as needed.(If the value specified by the kilobytes parameter is smaller than the minimum storage site or greater than the maximum s
completed.
CHKDSK is verifying indexes...
Index verification completed.
CHKDSK is verifying security descriptors...
Security descriptor verification completed.
12372 kilobytes total disk space.
3 kilobytes in 1 user files.
2 kilobytes in 1 indexes.
4217 kilobytes in use by the system.
8150
of reports generated at interval seconds apart. if the interval parameter is specified without the Count parameter, the pidstat command generates reports continuously.You can select information about specific task activities using flags. not specifying any flags selects only CPU activity.Options
-C comm
Display only tasks whose command name provided des the string comm.
-D
Report I/O statistics (kernels 2.6.20 and later only). The following values are displayed:
PID
The identification number of
memory is swapped out again, it is no longer necessary to write to the swap area.Process Information Area
Pid
Process ID
PPID
Parent Process ID
USER
User name of the process owner
PR
Priority level
NI
Nice value, i.e., priority correction, negative for high priority, positive for low-priority
VIRT
The total amount of virtual memory used by the process, in
so on. If you want to learn more about Linux systems, it is recommended to purchase related books for systematic learning. Below we describe how to analyze disk performance tools (in fact, not just disks):IostatSummarizes statistics on individual disks, providing metrics for disk load, usage, and saturation. A single line of system summary information is displayed by default, including the kernel version, hostname, log, schema, and number of CPUs, each of which contains one line of disk devices
consumption percentage L time Process CPU total, per second M time+ Total CPU time used by the process, units 1/100 seconds N%MEM the percentage of physical memory used by the process o The total amount of virtual memory used by the VIRT process, in kilobytes. The Virt=swap+res P swap process uses the amount of virtual memory that is swapped out, in kilobytes. The size, in
megabytes of RAM and 512 MB of swap space. The third line of output (Mem:) shows physical memory. The total column does not show the physical memory used by the core (typically around 1MB). The Used column shows the total amount of memory being used (the second row does not count as buffering). The free column shows all unused memory. Shared columns show the total amount of memory shared by multiple processes. The Buffers column displays the current size of the disk cache. Line five (swap:) on
. Memory and garbage collection data are printed every second. Let's come together to understand the meaning of each column:
s0c and s1c: This column shows the current size (in kilobytes) of the SURVIVOR0 and Survivor1 regions.
s0u and s1u: This column shows the current usage of the Survivor0 and Survivor1 zones (in kilobytes). Note: At any time, there will always be a survivor area that is em
bandwidthSettings information for the server%maxusers-Displays the maximum number of users that the server can log on at the same time%maxanonymous-Displays the maximum number of anonymous users that the server can log on at the same timeUser Information%name-Displays the login username%ip-Displays the user IP address of the login%dir-Displays the current directory for the logged in user%disk-Displays the current disk for the logged in user%dfree-Displays the current disk space for the logged i
Tty
The terminal name of the startup process, and the process that is not started from the terminal is displayed as?
PR
Priority level
NI
Nice value, negative indicates high priority, positive values indicate low priority
P
Last CPU used, only meaningful in multi-CPU environment
%cpu
CPU time consumption percentage last updated to current
Time
Total CPU time used by the process, in
Audio and video parameters of streaming media
Definition
Resolution is an important concept related to images. It is a technical parameter for measuring the expressiveness of image details. High resolution is an important prerequisite for ensuring the clarity of the Color Monitor. Resolution indicates the precision of the screen image, that is, the number of points that the display can display. Generally, the "resolution" is expressed as the number of pixels in each direction. The higher the Res
There are many types of energy, and the amount of heat is also different. In order to facilitate mutual Comparison and Research on the total amount, China will put each kilogram containing 7000 calories (29306 kilo) standard Coal, also known as standard coal. In addition, China often converts all kinds of energy into tons of standard coal, for example, the energy of 1 ton of straw is equivalent to 0.5 tons of standard coal, 1CubeThe energy of Rice biogas is equivalent to 0.7 of standard coal.
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The fields have the following meanings:
Disk name of the disk
R/s reads per second
W/s writes per second
Kr/s kilobytes read per second
Kw/s kilobytes written per second
Wait average number of transactions waiting for service (Q length)
Actv average number of transactions actively
Being serviced (removed from
Queue but not yet
Completed)
% W percent of time there are transactions waiting
For ser
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