What do you need to know about vmstat?
vmstat (virtual memory statistics) is a valuable monitoring utility, which also provides information about block IO and CPU activity in addition to memory.
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.
Where can I find vmstat, SAR and iostat?
The vmstat, sar and iostat commands are the collection of package included in sysstat – the system monitoring tools. The iostat generates reports of CPU & all device statistics. You may download and install sysstat using source tarball from link sysstat, but we recommend installing through YUM command.
How to read vmstat output using Red Hat customer portal?
A large file (such as an ISO file) will be read and written to /dev/null using dd. Executed in parallel, vmstat will show the increased IO read load (the bi value).
How to show memory status in megabytes in vmstat?
With paramenter -S M : Displays memory status in Megabytes. Example: The memory is shown in MB here in the given figure. -n One header: It is used to display header only once rather than periodically.
What’s the CPU time for vmstat in Linux?
This process is quite CPU intensive and also demonstrates the execution of vmstat in parallel with a user CPU time of 97%: In this example, a file will be filled with random content using dd . For this, /dev/urandom will supply random numbers, which will be generated by the kernel. This will lead to an increased load on the CPU (sy – system time).
What does the final field St mean in vmstat?
The final field st represents the percentage of time a virtual CPU waits for a real CPU while the hypervisor is servicing another virtual processor. Essentially, the steal time cycle counts the amount of time that your virtual machine is ready to run but could not run due to other virtual machines competing for the CPU.