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42 lines
1.2 KiB
42 lines
1.2 KiB
.TH pidpersec 8 "2015-08-18" "USER COMMANDS"
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.SH NAME
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pidpersec \- Count new processes (via fork()). Uses Linux eBPF/bcc.
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.SH SYNOPSIS
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.B pidpersec
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.SH DESCRIPTION
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pidpersec shows how many new processes were created each second. There
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can be performance issues caused by many short-lived processes, which may not
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be visible in sampling tools like top(1). pidpersec provides one way to
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investigate this behavior.
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This works by tracing the kernel sched_fork() function using dynamic tracing,
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and will need updating to match any changes to this function.
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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 EXAMPLES
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.TP
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Count new processes created each second:
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#
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.B pidpersec
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.SH OVERHEAD
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This traces the kernel fork function, and maintains an in-kernel count which is
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read asynchronously from user-space. As the rate of this is generally expected to
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be low (<< 1000/s), the overhead is also expected to be 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 _examples.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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Brendan Gregg
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.SH SEE ALSO
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top(1)
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