Trace Method Invoke Chains With Cost Filter

Trace command syntax to Trace method invoke chains with cost filter. Copyable examples, output expectations, and common mistakes.

Terminal

trace <class-pattern> <method-pattern> '#cost > <10>'

trace <class-pattern> <method-pattern> '#cost > <10>'

#!/bin/bash

# Trace Method Invoke Chains With Cost Filter
trace {{class-pattern}} {{method-pattern}} '#cost > {{10}}'

Command Result

What happens when it runs

Shell behavior

Primary Effect

Writes to file. The command sends content into the output file instead of printing the final result to the terminal.

Terminal Expectation

A successful run is usually quiet. Verify the destination file after execution rather than expecting visible stdout.

Troubleshooting

One of the input files does not exist

Solution: Check each input path before running the command.

The destination file or directory is not writable

Solution: Verify write permissions on the target path and parent directory.

Shell redirection points to the wrong file

Solution: Double-check the output path before executing, especially when overwriting with >.

Command Breakdown

trace: Base Command; The executable that performs this operation. Here it runs Trace before the shell applies any redirect operators.
<class-pattern>: class pattern; The value supplied for class pattern.
<method-pattern>: method pattern; The value supplied for method pattern.
>: Output Redirection; Writes the command output to the output file, replacing any existing content.
<10>: Destination Path; The file that receives the final written output.

How To Run

Step 1
Run the command: trace 'com.example.MyClass' 'processData' '#cost > 10'
Step 2
Verify output for methods exceeding the specified cost threshold in the results.

Alternative Approaches

Alternative observability tools for the same job.