¿Cómo se comprueba el cambio de contexto?

How do you check context switching?

Now how to check the total number of context switches on your system. This can be done by running vmstat command with 1 second interval as shown below. The cs column shown in the vmstat output shows you the total number of context switches per second.

Overall results show context switching on page faults improves RAMpage performance from a previous maximum of 17% over the standard hierarchy, to 25%.

A fast context switch is performed, whenever a functional unit comes across an operation destined for another unit. Switching contexts on each load/store instruction sequence allows a much faster context switch in the execution unit than previously published designs do.

In general, the indirect cost of context switch ranges from several microseconds to more than one thousand microseconds for our workload. When the overall data size is larger than cache size, the overhead of refilling of L2 cache have substantial impact on the cost of context switch.

The disadvantage of context switching is that it requires some time for context switching i.e. the context switching time. Time is required to save the context of one process that is in the running state and then getting the context of another process that is about to come in the running state.

The answer is the Microsoft performance counter (perfmon.msc) under system/context switches or thread/context switches. Looking at the performance monitor for context switches based on threads is hard to figure out what process (es) is causing the high rate.

By default process explorer doesn’t show context switches and needs to be set in view | select columns | Process Performance | Activate context switches and context switch delta. You should see both columns in the main view of process explorer. The context switches row shows the total number of switches since the system boot time.

You should see both columns in the main view of process explorer. The context switches row shows the total number of switches since the system boot time. Sort the row and look for a)high values and b) fast growing values both are good indicator for high switch rates of the process (es).

You can determine whether context switching is excessive by comparing it with the value of Processor//% Privileged Time. If this counter is at 40 percent or more and the context-switching rate is high, then you can investigate the cause for high rates of context switches. Thanks for contributing an answer to Server Fault!