Using the /w option will cause the machine mode to switch automatically to an x86-based processor. Find the highest priority queue that contains ready threads. The /w option can only be used in 64-bit kernel debugging sessions on a thread running in a process that has a WOW64 state. Unlike the /p option, this translates the PTEs for all user-mode and kernel-mode processes, not only the process owning this thread. (64-bit kernel debugging only) Changes the active context for the thread to the WOW64 32-bit context. The context retrieved will be the last context remembered by WOW64; this is usually the last user-mode code executed by Thread. Worker Context Switch: Indicates the total number of context switch occurs for the worker which owns the task. (In this case, !process 0 0 is used to list all processes, then !process is used a second time to list all the threads for the desired process.). Thread The address of the thread. The context retrieved will be the last context remembered by WOW64; this is usually the last user-mode code executed by Thread. OS_Thread_ID: Indicates the Thread ID in Windows Operating System. (Live debugging only) If this option is included and Thread is nonzero, all transition page table entries (PTEs) will be automatically translated into physical addresses before access. Process is isolated. Task Context Switch: Indicates the number of context switches occurs during specific task execution. A context switch takes around 0.2µs between async tasks, versus 1.7µs between kernel threads. The dispatcher can call thread switches for various reasons: This command does not actually change the current thread. This includes updating the process state to running. After this command is executed, the debugger will have access to the most important registers and the stack trace for this thread. Until threads that are suspended or blocked become ready to run, the scheduler does not allocate any processor time to them, regardless of their priority. These are known as ready threads. For example, if the target is running on a 64-bit machine that is emulating an x86-based processor using WOW64, this option cannot be used. Threads share memory. This technique allows Operating Systems to be multitasking systems. The most common reasons for a context switch are: When a running thread needs to wait, it relinquishes the remainder of its time slice. But this advantage goes away if the context switch is due to I/O readiness: both converge to 1.7µs. (Live debugging only) If this option is included and Thread is nonzero, all transition page table entries (PTEs) for the process owning this thread will be automatically translated into physical addresses before access. Below mentioned table displays some of other important information held in thread kernel object about the thread. Context switch is the process of storing and restoring the state (context) of a thread so that execution can be resumed from the same point at a later time. The routine Switch (oldThread, nextThread) actually performs a thread switch. This register context persists until you allow the target to execute or use another register context command (.thread, .cxr, or .trap). 3. Here is an example. (This behavior is the same as that of .reload /user. Thread context switching also depends in part on how your JVM schedules threads with different priorities. The precise meaning of the phrase “context switch” varies. Threads created with the CREATE_SUSPENDED flag. To accomplish this goal, there is a concept of Context Switch which is referring to the process of saving and loading the state of a process or thread execution so that execution can be resumed from the same point of execution in later time. (This behavior is the same as that of .cache forcedecodeuser. Update the process control block and other important fields. Context switching is the act of saving the current threads running state so that it can restore a different thread's state so that it can run on the process. Place the thread that just finished executing at the end of the queue for its priority. ), /r See Register Context for full details. This option can only be used if the target is in native machine mode. Threads waiting for a synchronization object or input. The scheduler maintains a queue of executable threads for each priority level. Thread consume less resources. When running multiple threads, A Scheduler will allocate a slice of time for each thread, and switch the execution between them (Context Switching). Select a new process for execution. /w One common thing is calculating the amount of time the last thread/task/process used so that software (and the end user) can determine where all the CPU time is going. Use the !process extension to find the address of the desired thread. (This behavior is the same as that of .cache forcedecodeptes.). Switch saves all of oldThread's state (oldThread is the thread that is executing when Switch is called), so that it can resume executing the thread later, without the thread knowing it was suspended. If this is omitted or zero, the thread context is reset to the current thread. During a context switch the operating system can do additional work that isn't strictly part of the context switch. 2. For example, if the target is running on a 64-bit machine that is emulating an x86-based processor using WOW64, this option cannot be used. The steps in a context switch are: The following classes of threads are not ready threads. Thread is more efficient in term of communication. Now use the .thread command with the address of the desired thread. Thread switching is handled by the OS and occurs throughout the life of your app. This allows multiple processes to share a single central processing unit (CPU), and is an essential feature of a multitasking operating system.