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.TH uthreads 8 "2016-11-07" "USER COMMANDS"
.SH NAME
uthreads \- Trace thread creation events in Java or pthreads.
.SH SYNOPSIS
.B uthreads [-h] [-l {java}] [-v] pid
.SH 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.
.SH REQUIREMENTS
CONFIG_BPF and bcc.
.SH OPTIONS
.TP
\-l {java}
The language to trace (currently only Java is supported). When no language is
specified, only pthread creations are traced.
.TP
\-v
Print the resulting BPF program, for debugging purposes.
.TP
pid
The process id to trace.
.SH EXAMPLES
.TP
Trace Java thread creations:
#
.B uthreads -l java 148
.TP
Trace pthread creations:
#
.B uthreads 1802
.SH FIELDS
.TP
TIME
The event's time in seconds from the beginning of the trace.
.TP
ID
The thread's ID. The information in this column depends on the runtime.
.TP
TYPE
Event type -- thread start, stop, or pthread event.
.TP
DESCRIPTION
The thread's name or start address function name.
.SH OVERHEAD
Thread start and stop events are usually not very frequent, which makes this
tool's overhead negligible.
.SH SOURCE
This is from bcc.
.IP
https://github.com/iovisor/bcc
.PP
Also look in the bcc distribution for a companion _example.txt file containing
example usage, output, and commentary for this tool.
.SH OS
Linux
.SH STABILITY
Unstable - in development.
.SH AUTHOR
Sasha Goldshtein
.SH SEE ALSO
ustat(8), trace(8)