KERNELSHARK FREE DOWNLOAD

With the mouse focus on the list, using the keyboard up and down arrow keys will move the selection of the list as well as the graph cursor. If the task was blocked on a mutex and another RT task was scheduled in its place then when the high priority task wakes up again, there is a good chance that the task will be cache hot. This looks excellent Posted Feb 10, Have all threads wake up from a barrier wait and then loop 50 times grabbing each lock in sequence and do a small busy loop. I guess the choice of toolkit and programming language does not help. To try to force contention, pthread barriers are used.

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Personal tools Create account Log in. With the mouse focus on the list, using the keyboard up and down arrow keys will move the selection of the list as well as the graph cursor.

Posted Feb 10, But a theory was that by kernelshqrk so, we move a cache hot real-time process onto a cache cold CPU and possibly replace it with a cache cold process. With the introduction of Ftrace, we now have a utility to truly examine the impact that decision has made.

Navigation LinuxReviews breaking news. The high priority task will most likely try to take the mutex while the low priority task aleady has it. The first test took the naive approach krrnelshark just setting up four locks and having the tasks grab them in order.

A line will appear, then drag the mouse to the right. The colors on a task plot are determined by the CPU number it was running on. Posted Feb 4, 3: The above shows that the "migrate" task with PID had a 14 microsecond wake up latency.

The line of below the graph info area holds the control buttons. Have all threads wake up from a barrier wait and then loop 50 times grabbing each lock in sequence and do a small busy loop.

Letting filters contain fields that do not belong to an event be valid allows for various tricks where two events can share the same filter. Using KernelShark to analyze the real-time scheduler Posted Feb 6, The match criterion is one of the following:.

If the Graph follows is not selected, then the graph will not change. Posted Feb 5, Why punish the high kernelsark task even more because it blocked and had to wait for another task to run? Again, the all checkbox will select all tasks if selected, and will unselect all tasks when it is unselected.

Using KernelShark to analyze the real-time scheduler []

Using KernelShark to analyze the real-time scheduler Posted Feb 5, Expanding the system tree will show the individual events in the system, which can be selected. To zoom into the graph, press and hold the left mouse button. Filters The amount of data that can be stored in a trace. KernelShark is distributed in the same repository that trace-cmd is: Any task that was scheduled in between can easily push out the cache of this high priority task.

Using KernelShark to analyze the real-time scheduler

Selecting Show Help displays the syntext of the filter format, and the helper buttons can be used to find events and their corresponding fields. Sort by date Sort by score. The name of this test is called migrate.

To make kernelshak sense out of the graphs, you need to zoom into a given location to see the details of that time frame more clearly. The task name is also shown in the plot title area.

The high priority process is only contending with a single thread at a time. Remove all filters On start up of KernelShark, the filters, by default, will be applied to both the Graph and List areas.

KernelShark 1.0 released

The data on the plots are either CPU specific or task specific. The second test was on the right track. Building KernelShark doesn't require much.