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69 lines
1.6 KiB
69 lines
1.6 KiB
7 months ago
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.TH uthreads 8 "2018-10-09" "USER COMMANDS"
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.SH NAME
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uthreads, cthreads, javathreads \- Trace thread creation events in Java or pthreads.
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.SH SYNOPSIS
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.B cthreads [-h] [-v] pid
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.BR
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.B javathreads [-h] [-v] pid
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.BR
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.B uthreads [-h] [-l {c,java,none}] [-v] pid
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.SH DESCRIPTION
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This traces thread creation events in Java processes, or pthread creation
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events in any process. When a thread is created, its name or start address
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is printed.
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Since this uses BPF, only the root user can use this tool.
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.SH REQUIREMENTS
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CONFIG_BPF and bcc.
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.SH OPTIONS
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.TP
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\-l {c,java,none}
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The language to trace. C and none select tracing pthreads only, regardless
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of the runtime being traced.
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.TP
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\-v
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Print the resulting BPF program, for debugging purposes.
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.TP
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pid
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The process id to trace.
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.SH EXAMPLES
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.TP
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Trace Java thread creations:
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#
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.B uthreads -l java 148
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.TP
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Trace pthread creations:
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#
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.B uthreads 1802
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.SH FIELDS
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.TP
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TIME
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The event's time in seconds from the beginning of the trace.
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.TP
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ID
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The thread's ID. The information in this column depends on the runtime.
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.TP
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TYPE
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Event type -- thread start, stop, or pthread event.
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.TP
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DESCRIPTION
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The thread's name or start address function name.
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.SH OVERHEAD
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Thread start and stop events are usually not very frequent, which makes this
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tool's overhead negligible.
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.SH SOURCE
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This is from bcc.
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.IP
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https://github.com/iovisor/bcc
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.PP
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Also look in the bcc distribution for a companion _example.txt file containing
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example usage, output, and commentary for this tool.
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.SH OS
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Linux
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.SH STABILITY
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Unstable - in development.
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.SH AUTHOR
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Sasha Goldshtein
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.SH SEE ALSO
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ustat(8), trace(8)
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