Linux question: Take the command 'vmstat' in linux for a program, explain why the number of...

Linux question:

Take the command 'vmstat' in linux for a program, explain why the number of context switches is more than the number of interrupts?

Expert Solution

The vmstat (virtual memory statistics) command allows you to monitor your system’s memory usage. It shows how much virtual memory there is, and how much is free and paging activity. You can observe page-ins and page-outs as they happen. This is extremely useful for detecting shortages of physical memory, which can adversely affect system performance.

Number of context switches is more than the number of interrupts because:

A context switch (also sometimes referred to as a process switch or a task switch) is the switching of the CPU (central processing unit) from one process or thread to another. A process (also sometimes referred to as a task) is an executing (i.e., running) instance of a program.An interrupt is simply a signal that the hardware can send when it wants the processor’s attention. A common example of this is when a packet is received by the network card; when a packet is received, an interrupt is thrown and the CPU deals with the packet
There are three columns when the output of vmstat is generated: us (user) time, sy (system) time, and id (idle) time. These three break down the use of the CPU time in percentages. They should add up to 100%. Ideally, a CPU will spend most of its time in the us and id categories. The sy category refers to time the CPU spends doing driver/kernel-level work. This time is taken away from user applications. If the CPUs are spending most of their time in this category, it could indicate excessive context switching due to either CPU or memory bottlenecks, issues with kernel-level locking, or other problems leading to excessive number of number of context switching. A busy system will show a constant idle percentage near zero. But a busy system doesn’t necessarily mean that the system is overloaded.

venereology answered 6 months ago

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