NAME
uthreads, cthreads, javathreads - Trace thread creation events in Java or pthreads.
SYNOPSIS
cthreads [-h] [-v] pid javathreads [-h] [-v] pid uthreads [-h] [-l {c,java,none}] [-v] pid
DESCRIPTION
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.
AUTHOR
Sasha Goldshtein