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dotnet-counters-instructions.md

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dotnet-counters

Intro

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.

Install dotnet-counters

dotnet tool install --global dotnet-counters

Using dotnet-counters

SYNOPSIS

dotnet-counters [--version]
                [-h, --help]
                <command> [<args>]

OPTIONS

--version
    Display the version of the dotnet-counters utility.

-h, --help
    Show command line help

COMMANDS

list      Display a list of counter names and descriptions
monitor   Display periodically refreshing values of selected counters

LIST

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

MONITOR

### 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.