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fileslower tool for investigating latency outliers
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--[[ | ||
fileslower.lua - trace file I/O slower than a given threshold. | ||
USAGE: sysdig -c fileslower min_ms | ||
eg, | ||
sysdig -c fileslower 10 # show file I/O slower than 10 ms | ||
sysdig -c fileslower 0 # show all file I/O | ||
By default this skips file I/O to /dev. Modify the skip_dev variable in this | ||
chisel to change this behavior. | ||
Note: The file I/O traced is those matched by the sysdig filter: | ||
"evt.is_io=true and fd.type=file". | ||
Copyright (C) 2014 Brendan Gregg. | ||
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. | ||
This program is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
GNU General Public License for more details. | ||
You should have received a copy of the GNU General Public License | ||
along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
--]] | ||
description = "Trace file I/O slower than a threshold, or all file I/O"; | ||
short_description = "Trace slow file I/O"; | ||
category = "misc"; | ||
skip_dev = true -- skip /dev/... files | ||
args = | ||
{ | ||
{ | ||
name = "min_ms", | ||
description = "minimum millisecond threshold for showing file I/O", | ||
argtype = "int" | ||
}, | ||
} | ||
function on_set_arg(name, val) | ||
min_ms = tonumber(val) | ||
return true | ||
end | ||
function on_init() | ||
-- set these fields on_event() | ||
etype = chisel.request_field("evt.type") | ||
dir = chisel.request_field("evt.dir") | ||
datetime = chisel.request_field("evt.datetime") | ||
fname = chisel.request_field("fd.name") | ||
pname = chisel.request_field("proc.name") | ||
latency = chisel.request_field("evt.latency") | ||
-- filter for file I/O | ||
chisel.set_filter("evt.is_io=true and fd.type=file") | ||
print(string.format("%-23.23s %-12.12s %-8s %7s %s", "TIME", | ||
"PROCESS", "TYPE", "LAT(ms)", "FILE")) | ||
return true | ||
end | ||
function on_event() | ||
lat = evt.field(latency) / 1000000 | ||
fn = evt.field(fname) | ||
if evt.field(dir) == "<" and lat > min_ms then | ||
-- filter /dev files if needed | ||
if skip_dev == false or string.sub(fn, 0, 5) ~= "/dev/" then | ||
print(string.format("%-23.23s %-12.12s %-8s %7d %s", | ||
evt.field(datetime), evt.field(pname), evt.field(etype), lat, fn)) | ||
end | ||
end | ||
return true | ||
end |