/usr/share/systemtap/examples/lwtools/
/usr/share/systemtap/examples/lwtools
NameSizeModeActions
accept2close-nd.814240644editdlrm
accept2close-nd.meta5970644editdlrm
accept2close-nd.stp17980755editdlrm
accept2close-nd.txt33850644editdlrm
biolatency-nd.816710644editdlrm
biolatency-nd.meta6220644editdlrm
biolatency-nd.stp20710755editdlrm
biolatency-nd_example.txt73620644editdlrm
bitesize-nd.811570644editdlrm
bitesize-nd.meta4910644editdlrm
bitesize-nd.stp15430755editdlrm
bitesize-nd_example.txt34260644editdlrm
execsnoop-nd.812350644editdlrm
execsnoop-nd.meta5700644editdlrm
execsnoop-nd.stp12830755editdlrm
execsnoop-nd_example.txt25850644editdlrm
fslatency-nd.819300644editdlrm
fslatency-nd.meta6600644editdlrm
fslatency-nd.stp39820755editdlrm
fslatency-nd_example.txt133840644editdlrm
fsslower-nd.817530644editdlrm
fsslower-nd.meta6230644editdlrm
fsslower-nd.stp37150755editdlrm
fsslower-nd_example.txt19380644editdlrm
killsnoop-nd.811310644editdlrm
killsnoop-nd.meta3840644editdlrm
killsnoop-nd.stp12810755editdlrm
killsnoop-nd_example.txt19080644editdlrm
opensnoop-nd.812680644editdlrm
opensnoop-nd.meta3570644editdlrm
opensnoop-nd.stp10260755editdlrm
opensnoop-nd_example.txt11240644editdlrm
README1070644editdlrm
rwtime-nd.811460644editdlrm
rwtime-nd.meta4120644editdlrm
rwtime-nd.stp15990755editdlrm
rwtime-nd_example.txt41850644editdlrm
syscallbypid-nd.810890644editdlrm
syscallbypid-nd.meta4040644editdlrm
syscallbypid-nd.stp11000755editdlrm
syscallbypid-nd_example.txt93220644editdlrm
Edit: /usr/share/systemtap/examples/lwtools/biolatency-nd.8 (1671B)
.TH biolatency-nd 8 "2015-01-30" "USER COMMANDS" .SH NAME biolatency-nd \- Measure block I/O latency distribution. Uses Linux SystemTap (non-debuginfo). .SH SYNOPSIS .B biolatency-nd.stp [interval [count]] .SH 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. This script uses the kernel tracepoints block_rq_issue and block_rq_complete, to trace the time from storage request to completion. To include extra time spent queued in the kernel, change block_rq_issue to block_rq_insert. .SH REQUIREMENTS SystemTap. .SH OPTIONS .TP interval Interval for reports, in seconds. .TP count Number of reports to output. .SH EXAMPLES .TP Measure block I/O latency, and show a distribution histogram on Ctrl-C: # .B biolatency-nd.stp .TP Measure block I/O latency, and show a report every second, five times: # .B biolatency-nd.stp 1 5 .SH FIELDS .TP value The minimum value, in nanoseconds, for this histogram bucket. Read this value as "I/O latency was at least xxx". .TP count How many I/O fell into this latency range. .SH OVERHEAD Should be low, relative to the rate of disk I/O. Test first. .SH SOURCE This is from the SystemTap lwtools collection. .IP https://github.com/brendangregg/systemtap-lwtools .PP Also look under the examples directory for a text file containing example usage, output, and commentary for this tool. .SH OS Linux .SH STABILITY Unstable - in development. .SH AUTHOR Brendan Gregg .SH SEE ALSO iostat(1)