Scroll to navigation

uthreads(8) System Manager's Manual uthreads(8)

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

The language to trace. C and none select tracing pthreads only, regardless of the runtime being traced.
Print the resulting BPF program, for debugging purposes.
The process id to trace.

EXAMPLES

# uthreads -l java 148
# uthreads 1802

FIELDS

The event's time in seconds from the beginning of the trace.
The thread's ID. The information in this column depends on the runtime.
Event type -- thread start, stop, or pthread event.
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

AUTHOR

Sasha Goldshtein

SEE ALSO

ustat(8), trace(8)

2018-10-09 USER COMMANDS