uthreads-bpfcc8
Trace thread creation events in java or pthreads.
Usage
cthreads [-h]
[-v]
pid
javathreads
[-h]
[-v]
pid
uthreads
[-h]
[-l
c,java,none]
[-v]
pid
Overview
This traces thread creation events in Java processes, or pthread creation events in any process. When a thread is created, its name or start address is printed.
Since this uses BPF, only the root user can use this tool.
Requirements
CONFIG_BPF and bcc.
Options
-
-l {c,java,none} -
The language to trace. C and none select tracing pthreads only, regardless of the runtime being traced.
-
-v -
Print the resulting BPF program, for debugging purposes.
- pid
-
The process id to trace.
Examples
- Trace Java thread creations:
-
# uthreads -l java 148
- Trace pthread creations:
-
# uthreads 1802
Fields
- TIME
-
The event's time in seconds from the beginning of the trace.
- ID
-
The thread's ID. The information in this column depends on the runtime.
- TYPE
-
Event type -- thread start, stop, or pthread event.
- DESCRIPTION
-
The thread's name or start address function name.
Overhead
Thread start and stop events are usually not very frequent, which makes this tool's overhead negligible.
Source
This is from bcc.
-
https://github.com/iovisor/bcc
Also look in the bcc distribution for a companion _example.txt file containing example usage, output, and commentary for this tool.
OS
Linux
Stability
Unstable - in development.