Kernel statistics

Kernel statistics is enabled by default. Following fields are available in the kernel statistics section:

Runnable

Number of runnable processes that are ready to run per second in the run queue. The run queue is maintained by the process scheduler and contains the list of threads that are ready to be dispatched.

Swap-in

Length of the swap queue per second, which means the number of ready processes that are waiting to be paged-in per second. The swap queue contains the list of processes that are ready to run but are swapped out with the currently running processes.

pswitch

Number of process context switches per second.

syscall

Number of system calls that are run per second.

read

Number of read system calls that are run per second.

write

Number of write system calls that are run per second.

fork

Number of fork system calls that are run per second.

exec

Number of exec system calls that are run per second.

sem

Number of Inter Process Communication (IPC) semaphore operations that are run per second.

msg

Number of IPC message operations that are run per second.

asleep_bufio

Number of processes that are in sleep state and are waiting for buffered I/O operation to complete at a particular time.

asleep_rawio

Number of processes that are sleeping and waiting for raw I/O operations at a particular time. Raw I/O operation allows applications to perform a direct write operation to the Logical Volume Manager (LVM) layer.

asleep_diocio

Number of processes that are in sleep state and are waiting for direct file system I/O operations and concurrent I/O operations at a particular time.