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Man Pages


Manual Reference Pages  -  SAMPLE (8)

NAME

sample - examine backtrace of system processes

CONTENTS

Synopsis
Description
History
Bugs

SYNOPSIS

sample [-n count] [-s duration] [-S]

DESCRIPTION

The sample utility performs a periodic examination of stacks (user and kernel) for all processes on the system.

The -n option specifies the number of samples to take; the -s option indicates the duration, in ms (default is 20). The -S option will attempt to symbolicate the addresses. Note that this option may not be enabled at compile time, but will not generate an error if so.

The sample utility requires a corresponding device driver to be loaded. Only one instance can be run at a time.

HISTORY

The sample utility was written by iXsystems in 2014, inspired heavily by the spindump utility in Mac OS X by Apple, Inc.

BUGS

Only one instance may be run at a time.

The name leaves a lot to be desired.

The sampling of idle processes can take longer than the duration, resulting in fewer samples than requested.

Even when enabled, the symbolication could be better.

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