dotnet-counters is a performance monitoring tool for ad-hoc health monitoring or 1st level performance investigation. It can observe performance counter values that are published via
EventCounter API (https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.tracing.eventcounter). For example, you can quickly monitor things like the CPU usage or the rate of exceptions being thrown in your .NET Core application to see if there is anything suspiscious before diving into more serious performance investigation using PerfView or dotnet-trace.
dotnet tool install --global dotnet-counters --version 1.0.4-preview6.19311.1
dotnet-counters [--version] [-h, --help] <command> [<args>]
--version Display the version of the dotnet-counters utility. -h, --help Show command line help
list Display a list of counter names and descriptions monitor Display periodically refreshing values of selected counters
dotnet-counters list [-h|--help] Display a list of counter names and descriptions, grouped by provider. -h, --help Show command line help Examples: > dotnet-counters list Showing well-known counters only. Specific processes may support additional counters. System.Runtime cpu-usage Amount of time the process has utilized the CPU (ms) working-set Amount of working set used by the process (MB) gc-heap-size Total heap size reported by the GC (MB) gen-0-gc-count Number of Gen 0 GCs / sec gen-1-gc-count Number of Gen 1 GCs / sec gen-2-gc-count Number of Gen 2 GCs / sec exception-count Number of Exceptions / sec
### Examples: 1. Monitoring all counters from `System.Runtime` at a refresh interval of 3 seconds: > dotnet-counters monitor --process-id 1902 System.Runtime Press p to pause, r to resume, q to quit. System.Runtime: CPU Usage (%) 24 Working Set (MB) 1982 GC Heap Size (MB) 811 Gen 0 GC / second 20 Gen 1 GC / second 4 Gen 1 GC / Second 1 Number of Exceptions / sec 4 2. Monitoring just CPU usage and GC heap size from `System.Runtime` at a refresh interval of 5 seconds: > dotnet-counters monitor --process-id 1902 System.Runtime[cpu-usage,gc-heap-size,exception-count] Press p to pause, r to resume, q to quit. System.Runtime: CPU Usage (%) 24 GC Heap Size (MB) 811 Number of Exceptions / sec 4 3. Monitoring EventCounter values from user-defined EventSource: (see https://github.com/dotnet/corefx/blob/master/src/System.Diagnostics.Tracing/documentation/EventCounterTutorial.md on how to do this.0) > dotnet-counters monitor --process-id 1902 Samples-EventCounterDemos-Minimal Press p to pause, r to resume, q to quit. request 100 ### Syntax: dotnet-counters monitor [-h||--help] [-p|--process-id <pid>] [--refreshInterval <sec>] counter_list Display periodically refreshing values of selected counters -h, --help Show command line help -p,--process-id The ID of the process that will be monitored --refresh-interval The number of seconds to delay between updating the displayed counters counter_list A space separated list of counters. Counters can be specified provider_name[:counter_name]. If the provider_name is used without a qualifying counter_name then all counters will be shown. To discover provider and counter names, use the list command.