/usr/share/systemtap/examples/lwtools/ Current File: //usr/share/systemtap/examples/lwtools/biolatency-nd.meta

title: Measure block I/O latency distribution (non-debuginfo)
name: biolatency-nd.stp
author: Brendan Gregg
keywords: io
description: This measures block I/O latency (storage I/O, ie, disk I/O), and shows the distribution as a histogram. This can be useful to identify the characteristics of I/O latency, beyond the averages shown by iostat(1). For example, to study I/O latency outliers, or multi-modal distributions.
scope: system-wide
usage: ./biolatency-nd.stp [interval [count]]
arg_1: Output interval (seconds)
arg_2: Output count
test_support: stap -p4 biolatency-nd.stp
test_check: stap -p4 biolatency-nd.stp
test_installcheck: stap biolatency-nd.stp 1 1