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4.2.3. Track Cumulative IO
This section describes how to track the cumulative amount of I/O to the system.
traceio.stp
traceio.stp
Copyright (C) 2007 Red Hat, Inc., Eugene Teo <eteo@redhat.com>
Copyright (C) 2009 Kai Meyer <kai@unixlords.com>
Fixed a bug that allows this to run longer
And added the humanreadable function
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.
#! /usr/bin/env stap
# traceio.stp
# Copyright (C) 2007 Red Hat, Inc., Eugene Teo <eteo@redhat.com>
# Copyright (C) 2009 Kai Meyer <kai@unixlords.com>
# Fixed a bug that allows this to run longer
# And added the humanreadable function
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
global reads, writes, total_io
probe vfs.read.return {
reads[pid(),execname()] += $return
total_io[pid(),execname()] += $return
}
probe vfs.write.return {
writes[pid(),execname()] += $return
total_io[pid(),execname()] += $return
}
function humanreadable(bytes) {
if (bytes > 1024*1024*1024) {
return sprintf("%d GiB", bytes/1024/1024/1024)
} else if (bytes > 1024*1024) {
return sprintf("%d MiB", bytes/1024/1024)
} else if (bytes > 1024) {
return sprintf("%d KiB", bytes/1024)
} else {
return sprintf("%d B", bytes)
}
}
probe timer.s(1) {
foreach([p,e] in total_io- limit 10)
printf("%8d %15s r: %12s w: %12s\n",
p, e, humanreadable(reads[p,e]),
humanreadable(writes[p,e]))
printf("\n")
# Note we don't zero out reads, writes and total_io,
# so the values are cumulative since the script started.
}
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traceio.stp prints the top ten executables generating I/O traffic over time. In addition, it also tracks the cumulative amount of I/O reads and writes done by those ten executables. This information is tracked and printed out in 1-second intervals, and in descending order.
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