2002 2017 Ericsson AB, All Rights Reserved Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. The Initial Developer of the Original Code is Ericsson AB. etop Siri Hansen
etop Erlang Top is a tool for presenting information about Erlang processes similar to the information presented by "top" in UNIX.

Start Erlang Top with the provided scripts etop. This starts a hidden Erlang node that connects to the node to be measured. The measured node is specified with option -node. If the measured node has a different cookie than the default cookie for the user who invokes the script, the cookie must be explicitly specified with option -setcookie.

Under Windows, batch file etop.bat can be used.

When executing the etop script, configuration parameters can be specified as command-line options, for example, etop -node testnode@myhost -setcookie MyCookie. The following configuration parameters exist for the tool:

node

The measured node.

Value: atom()

Mandatory

 setcookie

Cookie to use for the etop node. Must be same as the cookie on the measured node.

Value: atom()

 lines

Number of lines (processes) to display.

Value: integer()

Default: 10

 interval

Time interval (in seconds) between each update of the display.

Value: integer()

Default: 5

 accumulate

If true, the execution time and reductions are accumulated.

Value: boolean()

Default: false

 sort

Identifies what information to sort by.

Value: runtime | reductions | memory | msg_q

Default: runtime (reductions if tracing=off)

 tracing

etop uses the Erlang trace facility, and thus no other tracing is possible on the measured node while etop is running, unless this option is set to off. Also helpful if the etop tracing causes too high load on the measured node. With tracing off, runtime is not measured.

Value: on | off

Default: on

For details about Erlang Top, see the User's Guide.

 start() -> ok Start etop.

Starts etop. Notice that etop is preferably started with the etop script.

 start(Options) -> ok Start etop. Options = [Option] Option = {Key, Value} Key = atom() Value = term()

Starts etop. To view the possible options, use help/0.

 help() -> ok Display the etop help.

Displays the help of etop and its options.

 config(Key,Value) -> Result Change the configuration of the tool. Result = ok | {error,Reason} Key = lines | interval | accumulate | sort Value = term()

Changes the configuration parameters of the tool during runtime. Allowed parameters are lines, interval, accumulate, and sort.

 dump(File) -> Result Dump the current display to a file. Result = ok | {error,Reason} File = string()

Dumps the current display to a text file.

 stop() -> stop Terminate etop.

Terminates etop.