PERF_ELAPSED_TIME

Article
03/04/2010

The Thread performance object consists of counters that measure aspects of thread behavior. A thread is the basic object that executes instructions on a processor. All running processes have at least one thread.

Counter Name	Description	Counter Type
% Privileged Time	Shows the percentage of elapsed time that this thread has spent executing code in privileged mode. When a Windows 2000 system service is called, the service often runs in privileged mode to gain access to system-private data. Such data is protected from access by threads executing in user mode. Calls to the system can be explicit or implicit, such as page faults or interrupts. Unlike some early operating systems, Windows 2000 uses process boundaries for subsystem protection in addition to the traditional protection of user and privileged modes. These subsystem processes provide additional protection. Therefore, some work done by Windows 2000 on behalf of your application might appear in other subsystem processes in addition to the privileged time in your process.	*PERF_100NSEC_TIMER*
% Processor Time	Shows the percentage of elapsed time that this thread used the processor to execute instructions. An instruction is the basic unit of execution in a processor, and a thread is the object that executes instructions. Code executed to handle certain hardware interrupts and trap conditions are included in this count.	*PERF_100NSEC_TIMER*
% User Time	Shows the percentage of elapsed time that this thread has spent executing code in user mode. Applications, environment subsystems, and integral subsystems execute in user mode. Code executing in user mode cannot damage the integrity of the Windows 2000 Executive, Kernel, and device drivers. Unlike some early operating systems, Windows 2000 uses process boundaries for subsystem protection in addition to the traditional protection of user and privileged modes. These subsystem processes provide additional protection. Therefore, some work done by Windows 2000 on behalf of your application might appear in other subsystem processes in addition to the privileged time in your process.	*PERF_100NSEC_TIMER*
Context Switches/sec	Shows the rate at which switches from one thread to another occur. Thread switches can occur either inside of a single process or across processes. A thread switch can be caused either by one thread asking another for information, or by a thread being preempted by another, higher priority thread becoming ready to run. Unlike some early operating systems, Windows 2000 uses process boundaries for subsystem protection in addition to the traditional protection of user and privileged modes. These subsystem processes provide additional protection. Therefore, some work done by Windows 2000 on behalf of an application might appear in other subsystem processes in addition to the privileged time in the application. Switching to the subsystem process causes one context switch in the application thread. Switching back causes another context switch in the subsystem thread.	*PERF_COUNTER_COUNTER*
Elapsed Time	Shows the total elapsed time, in seconds, that this thread has been running.	*PERF_ELAPSED_TIME*
ID Process	Shows the unique identifier of this process. ID Process numbers are reused, so they only identify a process for the lifetime of that process.	*PERF_COUNTER_RAWCOUNT*
ID Thread	Shows the unique identifier of this thread. ID Thread numbers are reused, so they only identify a thread for the lifetime of that thread.	*PERF_COUNTER_RAWCOUNT*
Priority Base	Shows the current base priority of this thread. The system can raise the thread's dynamic priority above the base priority if the thread is handling user input, or lower it toward the base priority if the thread becomes compute bound.	*PERF_COUNTER_RAWCOUNT*
Priority Current	Shows the current dynamic priority of this thread. The system can raise the thread's dynamic priority above the base priority if the thread is handling user input, or lower it toward the base priority if the thread becomes compute bound.	*PERF_COUNTER_RAWCOUNT*
Start Address	Shows the starting virtual address for this thread.	*PERF_COUNTER_RAWCOUNT*
Thread State	Shows the current state of the thread. Valid values are: 0Initialized 1Ready 2Running 3Standby 4 Terminated 5 Waiting 6 Transition 7 Unknown	*PERF_COUNTER_RAWCOUNT*
Thread Wait Reason	Shows the reason that a thread was in the Wait state and is only applicable when the thread is in the Wait state as reflected by Thread\Thread State (value is 5). Values are as follows: 0Waiting for a component of the Windows NT Executive 1Waiting for a page to be freed 2Waiting for a page to be mapped or copied 3Waiting for space to be allocated in the paged or nonpaged pool 4Waiting for an Execution Delay to be resolved 5Suspended 6Waiting for a user request 7Waiting for a component of the Windows NT Executive 8Waiting for a page to be freed 9Waiting for a page to be mapped or copied 10Waiting for space to be allocated in the paged or nonpaged pool 11Waiting for an Execution Delay to be resolved 12Suspended 13Waiting for a user request 14Waiting for an event pair high 15Waiting for an event pair low 16Waiting for an LPC Receive notice 17Waiting for an LPC Reply notice 18Waiting for virtual memory to be allocated 19Waiting for a page to be written to disk 20+(Reserved for future use)	*PERF_COUNTER_RAWCOUNT*

See also

Finding Bottlenecks on Multiprocessor Computers
Finding Processor Bottlenecks