Lock and Thread Performance Counters

The Performance console .NET CLR LocksAndThreads category includes counters that provide information about managed locks and threads that an application uses. The following table describes these performance counters.

Performance counter

Description

# of current logical Threads

Displays the number of current managed thread objects in the application. This counter maintains the count of both running and stopped threads. This counter is not an average over time; it displays only the last observed value.

# of current physical Threads

Displays the number of native operating system threads created and owned by the common language runtime to act as underlying threads for managed thread objects. This counter's value does not include the threads used by the runtime in its internal operations; it is a subset of the threads in the operating system process.

# of current recognized threads

Displays the number of threads that are currently recognized by the runtime. These threads are associated with a corresponding managed thread object. The runtime does not create these threads, but they have run inside the runtime at least once.

Only unique threads are tracked; threads with the same thread ID that reenter the runtime or are recreated after the thread exits are not counted twice.

# of total recognized Threads

Displays the total number of threads that have been recognized by the runtime since the application started. These threads are associated with a corresponding managed thread object. The runtime does not create these threads, but they have run inside the runtime at least once.

Only unique threads are tracked; threads with the same thread ID that reenter the runtime or are recreated after the thread exits are not counted twice.

Contention Rate / Sec

Displays the rate at which threads in the runtime attempt to acquire a managed lock unsuccessfully.

Current Queue Length

Displays the total number of threads that are currently waiting to acquire a managed lock in the application. This counter is not an average over time; it displays the last observed value.

Queue Length / sec

Displays the number of threads per second that are waiting to acquire a lock in the application. This counter is not an average over time; it displays the difference between the values observed in the last two samples divided by the duration of the sample interval.

Queue Length Peak

Displays the total number of threads that waited to acquire a managed lock since the application started.

rate of recognized threads / sec

Displays the number of threads per second that have been recognized by the runtime. These threads are associated with a corresponding managed thread object. The runtime does not create these threads, but they have run inside the runtime at least once.

Only unique threads are tracked; threads with the same thread ID that reenter the runtime or are recreated after the thread exits are not counted twice.

This counter is not an average over time; it displays the difference between the values observed in the last two samples divided by the duration of the sample interval.

Total # of Contentions

Displays the total number of times that threads in the runtime have attempted to acquire a managed lock unsuccessfully.

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