Track Method Invoke Chain Exceeding Cost And Limit

Use BTrace to monitor Java method invocations exceeding cost limits. Focuses on class/method patterns, real-time tracing, with a count cap.

More Trace

Terminal

trace <class-pattern> <method-pattern> '#cost > <10>' -n 5

trace <class-pattern> <method-pattern> '#cost > <10>' -n 5

#!/bin/bash

# Track Method Invoke Chain Exceeding Cost And Limit
trace {{class-pattern}} {{method-pattern}} '#cost > {{10}}' -n 5

When To Use

Deploy during deep-dive performance diagnostics when hunting for execution bottlenecks in a distributed microservices architecture. Particularly applicable when suspicious spikes in response time or CPU usage correlate to specific Java classes or methods.

Pro Tip

Adjusting the '#cost' threshold dynamically can surface hidden inefficiencies. Leverage JVM options for memory profiling parallel to this command for comprehensive insights.

Command Builder

Tune the command before you copy it

Back to syntax

Generated Command

trace <class-pattern> <method-pattern> '#cost > <10>' -n 5

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

Common pitfalls

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

What each part is doing

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.
-n: Command Option; Tool-specific option used by this command invocation.
>: 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

Execution path

Step 1
Run the command: trace com.example.* process* '#cost > 10' -n 5
Step 2
Verify output for methods exceeding specified cost limit with invocation counts and costs.

Alternative Approaches

Comparable commands in other tools

Alternative observability tools for the same job.

Trace Cmd / Display Recorded Trace Specific Cpu Linux sudo trace-cmd report --cpu <cpu_number> Trace Cmd / Start Tracing With Plugin Linux sudo trace-cmd start -p <function|function_graph|preemptirqsoff|irqsoff|preemptoff|wakeup|...> Trace Cmd / Stop Tracing Retain Buffers Linux sudo trace-cmd stop Trace Cmd / Record Trace With Plugin Linux sudo trace-cmd record -p <plugin> Trace Cmd / Clear Trace Buffers Linux sudo trace-cmd clear