What is WA in vmstat?

What is WA in vmstat?

The vmstat wa column is the percentage of time that the CPU was idle with pending local disk I/O and NFS-mounted disks. If there is at least one outstanding I/O to a disk when wait is running, the time is classified as waiting for I/O.

What is Swapd in vmstat?

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. However, I just found that the value of ‘swpd’ of my server is not zero.

How do I use vmstat?

How to Use vmstat

1. If you don’t have vmstat on your machine, install it by running:
2. Enter your password and wait for the installation to finish.
3. Run vmstat without parameters to display a system report with average statistics since the last boot.
4. For additional reports, use vmstat options, delay, and count.

What does vmstat stand for?

vmstat (virtual memory statistics) is a valuable monitoring utility, which also provides information about block IO and CPU activity in addition to memory. vmstat Basics. vmstat provides a number of values and will typically be called using two numerical parameters.

What is vmstat and Iostat?

iostat stands for input output statistics and reports statistics for i/o devices such as disk drive. vmstat gives the statistics for virtual Memory and netstat gives the network statistics .

How do I use Vmstat?

What is R and B in Vmstat?

(Source man vmstat): Procs r: The number of processes waiting for run time. b: The number of processes in uninterruptible sleep. Memory swpd: the amount of virtual memory used.

What is the output of The vmstat command?

Basic vmstat Output 1 swpd – Total virtual memory. The swap space is initially unoccupied. However, the kernel starts using swap space as the… 2 free – Total free memory. 3 buff – Total memory temporarily used as a data buffer. 4 cache – Total cache memory. More

Where do I find waiting CPU resources in vmstat?

Waiting CPU resources can be shown in UNIX vmstat command output as the second column under the kthr (kernel thread state change) heading (see Listing 2-1). Tasks may be placed in the wait queue (?b?) if they are waiting on a resource, while other tasks appear in the run queue (?r?) column.

What does it mean when vmstat is running in parallel?

This will lead to an increased load on the CPU (sy – system time). At the same time, the vmstat executing in parallel will indicate that between 93% and 97% of the CPU time is being used for the execution of kernel code (for the generation of random numbers, in this case).

What are the different types of vmstat reports?

There are four classes of vmstat reports: Exception reports – These reports show the time period where predefined thresholds are exceeded. Daily trend reports – These reports are often run and used with Excel spreadsheets to produce trending graphs.