What is Si and so in vmstat?
(-a option) Swap si: Amount of memory swapped in from disk (/s). so: Amount of memory swapped to disk (/s). IO bi: Blocks received from a block device (blocks/s).
What does vmstat mean in Linux?
Virtual memory statistics reporter
Virtual memory statistics reporter, also known as vmstat , is a Linux command-line tool that reports various bits of system information. Things like memory, paging, processes, IO, CPU, and disk scheduling are all included in the array of information provided. Subsequent reports use measurements of delay and count.
What is vmstat?
The vmstat command reports statistics about kernel threads in the run and wait queue, memory, paging, disks, interrupts, system calls, context switches, and CPU activity. The reported CPU activity is a percentage breakdown of user mode, system mode, idle time, and waits for disk I/O.
What is SWPD in vmstat?
1. According to the man page of vmstat , ‘swpd’ means the amount of virtual memory used. As my understanding, for most cases it should be zero unless the physical CPU is out of space.
How do I run vmstat?
How to Use vmstat
- If you don’t have vmstat on your machine, install it by running:
- Enter your password and wait for the installation to finish.
- Run vmstat without parameters to display a system report with average statistics since the last boot.
- For additional reports, use vmstat options, delay, and count.
Why we use vmstat in Linux?
vmstat command in Linux/Unix is a performance monitoring command of the system as it gives the information about processes, memory, paging, block IO, disk, and CPU scheduling. All these functionalities makes the command vmstat also known as virtual memory statistic reporter.
What is non nice user CPU ticks?
any cpu tick by user process which was not nice’d nice is a way to change priorities of processes http://en.wikipedia.org/wiki/Nice_(Unix) if you do not use this command to manipulate priorities you most likely end up all your user cpu ticks in the non nice section of the stats.
How do you understand top command?
Top command shows all running processes in the server. It shows you the system information and the processes information just like up-time, average load, tasks running, no. of users logged in, no. of CPU processes, RAM utilisation and it lists all the processes running/utilised by the users in your server.
What does The vmstat command do in Linux?
If you type vmstat as a command with no parameters, it will show you a set of values. These values are the averages for each of the statistics since your computer was last rebooted.
What should I expect when I run vmstat?
Things like memory, paging, processes, IO, CPU, and disk scheduling are all included in the array of information provided. When you run vmstat, keep in mind that the first report is an average of the requested information since the time of the last reboot. Subsequent reports use measurements of delay and count.
What does Io bi and Bo mean in vmstat?
IO bi: Blocks received from a block device (blocks/s). bo: Blocks sent to a block device (blocks/s). System in: The number of interrupts per second, including the clock. cs: The number of context switches per second.
How to generate a vmstat report using megabytes?
The output shows memory statistics in kilobytes by default. To generate a report using megabytes, use the -S option. To generate more detailed information about memory, event counters, and CPU scheduling statistics, run the following command: The output shows a report similar to the vmstat basic report, with more details in some sections.