diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,30 @@ +Copyright (c)2011, Johan Tibell + +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following + disclaimer in the documentation and/or other materials provided + with the distribution. + + * Neither the name of Johan Tibell nor the names of other + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/System/Remote/Monitoring.hs b/System/Remote/Monitoring.hs new file mode 100644 --- /dev/null +++ b/System/Remote/Monitoring.hs @@ -0,0 +1,212 @@ +{-# LANGUAGE OverloadedStrings, RecordWildCards #-} +-- | Allows for remote monitoring of a running process over HTTP. +-- +-- This module can be used to run an HTTP server that replies to HTTP +-- requests with either an HTML page or a JSON object. The former can +-- be used by a human to get an overview of a program's GC stats and +-- the latter can be used be automated tools. +-- +-- Typical usage is to start the monitor server on program startup +-- +-- > main = do +-- > forkServer "localhost" 8000 +-- > ... +-- +-- and then periodically check the stats using a web browser or a +-- command line tool like curl +-- +-- > $ curl -H "Accept: application/json" http://localhost:8000/ +module System.Remote.Monitoring + ( + -- * Required configuration + -- $configuration + + -- * JSON API + -- $api + forkServer + ) where + +import Control.Applicative ((<$>), (<|>)) +import Control.Concurrent (ThreadId, forkIO) +import Control.Monad.IO.Class (liftIO) +import qualified Data.Aeson.Encode as A +import Data.Aeson.Types ((.=)) +import qualified Data.Aeson.Types as A +import qualified Data.ByteString as S +import qualified Data.ByteString.Char8 as S8 +import Data.Function (on) +import qualified Data.List as List +import Data.Word (Word8) +import qualified GHC.Stats as Stats +import Paths_ekg (getDataDir) +import Snap.Core (Request, Snap, getHeaders, getRequest, modifyResponse, pass, + route, setContentType, writeLBS) +import Snap.Http.Server (httpServe) +import qualified Snap.Http.Server.Config as Config +import Snap.Util.FileServe (serveDirectory) +import System.FilePath (()) + +-- $configuration +-- +-- To use this module you must first enable GC stats collection for +-- your program. To enable GC stats collection, either run your +-- program with +-- +-- > +RTS -T +-- +-- or compile it with +-- +-- > -with-rtsopts=-T +-- +-- The runtime overhead of @-T@ is very small so it's safe to always +-- leave it enabled. + +-- $api +-- +-- The HTTP server replies to GET requests to the host and port passed +-- to 'forkServer'. To get a JSON formatted response, the client must +-- set the Accept header to \"application\/json\". The server returns +-- a JSON object with the following members: +-- +-- [@bytes_allocated@] Total number of bytes allocated +-- +-- [@num_gcs@] Number of garbage collections performed +-- +-- [@max_bytes_used@] Maximum number of live bytes seen so far +-- +-- [@num_bytes_usage_samples@] Number of byte usage samples taken +-- +-- [@cumulative_bytes_used@] Sum of all byte usage samples, can be +-- used with @numByteUsageSamples@ to calculate averages with +-- arbitrary weighting (if you are sampling this record multiple +-- times). +-- +-- [@bytes_copied@] Number of bytes copied during GC +-- +-- [@current_bytes_used@] Current number of live bytes +-- +-- [@current_bytes_slop@] Current number of bytes lost to slop +-- +-- [@max_bytes_slop@] Maximum number of bytes lost to slop at any one time so far +-- +-- [@peak_megabytes_allocated@] Maximum number of megabytes allocated +-- +-- [@mutator_cpu_seconds@] CPU time spent running mutator threads. +-- This does not include any profiling overhead or initialization. +-- +-- [@mutator_wall_seconds@] Wall clock time spent running mutator +-- threads. This does not include initialization. +-- +-- [@gc_cpu_seconds@] CPU time spent running GC +-- +-- [@gc_wall_seconds@] Wall clock time spent running GC +-- +-- [@cpu_seconds@] Total CPU time elapsed since program start +-- +-- [@wall_seconds@] Total wall clock time elapsed since start +-- +-- [@par_avg_bytes_copied@] Number of bytes copied during GC, minus +-- space held by mutable lists held by the capabilities. Can be used +-- with 'parMaxBytesCopied' to determine how well parallel GC utilized +-- all cores. +-- +-- [@par_max_bytes_copied@] Sum of number of bytes copied each GC by +-- the most active GC thread each GC. The ratio of +-- 'parAvgBytesCopied' divided by 'parMaxBytesCopied' approaches 1 for +-- a maximally sequential run and approaches the number of threads +-- (set by the RTS flag @-N@) for a maximally parallel run. + +-- | Start an HTTP server in a new thread. The server replies to GET +-- requests to the given host and port. The host argument can be +-- either a numeric network address (dotted quad for IPv4, +-- colon-separated hex for IPv6) or a hostname (e.g. \"localhost\"). +-- The client can set the desired response format (i.e. Content-Type) +-- by setting the Accept header. At the moment two response formats +-- are available: \"application\/json\" and \"text\/html\". +-- +-- You can kill the server by killing the thread (i.e. by throwing it +-- an asynchronous exception.) +forkServer :: S.ByteString -- ^ Host to listen on (e.g. \"localhost\") + -> Int -- ^ Port to listen on (e.g. 8000) + -> IO ThreadId +forkServer host port = forkIO $ httpServe conf monitor + where conf = Config.setErrorLog Config.ConfigNoLog $ + Config.setAccessLog Config.ConfigNoLog $ + Config.setPort port $ + Config.setHostname host $ + Config.defaultConfig + +-- Newtype wrapper to avoid orphan instance. +newtype Stats = Stats Stats.GCStats + +instance A.ToJSON Stats where + toJSON (Stats (Stats.GCStats {..})) = A.object + [ "bytes_allocated" .= bytesAllocated + , "num_gcs" .= numGcs + , "max_bytes_used" .= maxBytesUsed + , "num_bytes_usage_samples" .= numByteUsageSamples + , "cumulative_bytes_used" .= cumulativeBytesUsed + , "bytes_copied" .= bytesCopied + , "current_bytes_used" .= currentBytesUsed + , "current_bytes_slop" .= currentBytesSlop + , "max_bytes_slop" .= maxBytesSlop + , "peak_megabytes_allocated" .= peakMegabytesAllocated + , "mutator_cpu_seconds" .= mutatorCpuSeconds + , "mutator_wall_seconds" .= mutatorWallSeconds + , "gc_cpu_seconds" .= gcCpuSeconds + , "gc_wall_seconds" .= gcWallSeconds + , "cpu_seconds" .= cpuSeconds + , "wall_seconds" .= wallSeconds + , "par_avg_bytes_copied" .= parAvgBytesCopied + , "par_max_bytes_copied" .= parMaxBytesCopied + ] + +-- | A handler that can be installed into an existing Snap application. +monitor :: Snap () +monitor = do + dataDir <- liftIO getDataDir + route [ ("/", index) ] + <|> serveDirectory (dataDir "public") + +index :: Snap () +index = do + req <- getRequest + let acceptHdr = maybe "application/json" (List.head . parseHttpAccept) $ + getAcceptHeader req + if acceptHdr == "application/json" + then serveJson + else pass + where + serveJson = do + modifyResponse $ setContentType "application/json" + stats <- liftIO Stats.getGCStats + writeLBS $ A.encode $ A.toJSON $ Stats $ stats + + getAcceptHeader :: Request -> Maybe S.ByteString + getAcceptHeader req = S.intercalate "," <$> getHeaders "Accept" req + +------------------------------------------------------------------------ +-- Utilities for working with accept headers + +-- | Parse the HTTP accept string to determine supported content types. +parseHttpAccept :: S.ByteString -> [S.ByteString] +parseHttpAccept = List.map fst + . List.sortBy (rcompare `on` snd) + . List.map grabQ + . S.split 44 -- comma + where + rcompare :: Double -> Double -> Ordering + rcompare = flip compare + grabQ s = + let (s', q) = breakDiscard 59 s -- semicolon + (_, q') = breakDiscard 61 q -- equals sign + in (trimWhite s', readQ $ trimWhite q') + readQ s = case reads $ S8.unpack s of + (x, _):_ -> x + _ -> 1.0 + trimWhite = S.dropWhile (== 32) -- space + +breakDiscard :: Word8 -> S.ByteString -> (S.ByteString, S.ByteString) +breakDiscard w s = + let (x, y) = S.break (== w) s + in (x, S.drop 1 y) diff --git a/ekg.cabal b/ekg.cabal new file mode 100644 --- /dev/null +++ b/ekg.cabal @@ -0,0 +1,36 @@ +name: ekg +version: 0.1.0.0 +synopsis: Remote monitoring of executables +description: + This library lets you remotely monitor a running process over HTTP. + It provides a simple way to integrate a monitoring server into any + application. +homepage: https://github.com/tibbe/ekg +license: BSD3 +license-file: LICENSE +author: Johan Tibell +maintainer: johan.tibell@gmail.com +category: System, Network +build-type: Simple +cabal-version: >=1.6 +data-files: public/index.html, public/monitor.js, public/monitor.css, + public/jquery.flot.min.js public/blueprint/screen.css + public/blueprint/print.css public/blueprint/ie.css + +library + exposed-modules: System.Remote.Monitoring + + other-modules: Paths_ekg + + build-depends: aeson < 0.6, + base >= 4.5 && < 5, + bytestring < 1.0, + filepath < 1.4, + snap-core < 0.8, + snap-server < 0.8, + transformers < 0.3 + ghc-options: -Wall + +source-repository head + type: git + location: https://github.com/tibbe/ekg.git diff --git a/public/blueprint/ie.css b/public/blueprint/ie.css new file mode 100644 --- /dev/null +++ b/public/blueprint/ie.css @@ -0,0 +1,36 @@ +/* ----------------------------------------------------------------------- + + + Blueprint CSS Framework 1.0.1 + http://blueprintcss.org + + * Copyright (c) 2007-Present. See LICENSE for more info. + * See README for instructions on how to use Blueprint. + * For credits and origins, see AUTHORS. + * This is a compressed file. See the sources in the 'src' directory. + +----------------------------------------------------------------------- */ + +/* ie.css */ +body {text-align:center;} +.container {text-align:left;} +* html .column, * html .span-1, * html .span-2, * html .span-3, * html .span-4, * html .span-5, * html .span-6, * html .span-7, * html .span-8, * html .span-9, * html .span-10, * html .span-11, * html .span-12, * html .span-13, * html .span-14, * html .span-15, * html .span-16, * html .span-17, * html .span-18, * html .span-19, * html .span-20, * html .span-21, * html .span-22, * html .span-23, * html .span-24 {display:inline;overflow-x:hidden;} +* html legend {margin:0px -8px 16px 0;padding:0;} +sup {vertical-align:text-top;} +sub {vertical-align:text-bottom;} +html>body p code {*white-space:normal;} +hr {margin:-8px auto 11px;} +img {-ms-interpolation-mode:bicubic;} +.clearfix, .container {display:inline-block;} +* html .clearfix, * html .container {height:1%;} +fieldset {padding-top:0;} +legend {margin-top:-0.2em;margin-bottom:1em;margin-left:-0.5em;} +textarea {overflow:auto;} +label {vertical-align:middle;position:relative;top:-0.25em;} +input.text, input.title, textarea {background-color:#fff;border:1px solid #bbb;} +input.text:focus, input.title:focus {border-color:#666;} +input.text, input.title, textarea, select {margin:0.5em 0;} +input.checkbox, input.radio {position:relative;top:.25em;} +form.inline div, form.inline p {vertical-align:middle;} +form.inline input.checkbox, form.inline input.radio, form.inline input.button, form.inline button {margin:0.5em 0;} +button, input.button {position:relative;top:0.25em;} diff --git a/public/blueprint/print.css b/public/blueprint/print.css new file mode 100644 --- /dev/null +++ b/public/blueprint/print.css @@ -0,0 +1,29 @@ +/* ----------------------------------------------------------------------- + + + Blueprint CSS Framework 1.0.1 + http://blueprintcss.org + + * Copyright (c) 2007-Present. See LICENSE for more info. + * See README for instructions on how to use Blueprint. + * For credits and origins, see AUTHORS. + * This is a compressed file. See the sources in the 'src' directory. + +----------------------------------------------------------------------- */ + +/* print.css */ +body {line-height:1.5;font-family:"Helvetica Neue", Arial, Helvetica, sans-serif;color:#000;background:none;font-size:10pt;} +.container {background:none;} +hr {background:#ccc;color:#ccc;width:100%;height:2px;margin:2em 0;padding:0;border:none;} +hr.space {background:#fff;color:#fff;visibility:hidden;} +h1, h2, h3, h4, h5, h6 {font-family:"Helvetica Neue", Arial, "Lucida Grande", sans-serif;} +code {font:.9em "Courier New", Monaco, Courier, monospace;} +a img {border:none;} +p img.top {margin-top:0;} +blockquote {margin:1.5em;padding:1em;font-style:italic;font-size:.9em;} +.small {font-size:.9em;} +.large {font-size:1.1em;} +.quiet {color:#999;} +.hide {display:none;} +a:link, a:visited {background:transparent;font-weight:700;text-decoration:underline;} +a:link:after, a:visited:after {content:" (" attr(href) ")";font-size:90%;} diff --git a/public/blueprint/screen.css b/public/blueprint/screen.css new file mode 100644 --- /dev/null +++ b/public/blueprint/screen.css @@ -0,0 +1,265 @@ +/* ----------------------------------------------------------------------- + + + Blueprint CSS Framework 1.0.1 + http://blueprintcss.org + + * Copyright (c) 2007-Present. See LICENSE for more info. + * See README for instructions on how to use Blueprint. + * For credits and origins, see AUTHORS. + * This is a compressed file. See the sources in the 'src' directory. + +----------------------------------------------------------------------- */ + +/* reset.css */ +html {margin:0;padding:0;border:0;} +body, div, span, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, code, del, dfn, em, img, q, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, dialog, figure, footer, header, hgroup, nav, section {margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline;} +article, aside, details, figcaption, figure, dialog, footer, header, hgroup, menu, nav, section {display:block;} +body {line-height:1.5;background:white;} +table {border-collapse:separate;border-spacing:0;} +caption, th, td {text-align:left;font-weight:normal;float:none !important;} +table, th, td {vertical-align:middle;} +blockquote:before, blockquote:after, q:before, q:after {content:'';} +blockquote, q {quotes:"" "";} +a img {border:none;} +:focus {outline:0;} + +/* typography.css */ +html {font-size:100.01%;} +body {font-size:75%;color:#222;background:#fff;font-family:"Helvetica Neue", Arial, Helvetica, sans-serif;} +h1, h2, h3, h4, h5, h6 {font-weight:normal;color:#111;} +h1 {font-size:3em;line-height:1;margin-bottom:0.5em;} +h2 {font-size:2em;margin-bottom:0.75em;} +h3 {font-size:1.5em;line-height:1;margin-bottom:1em;} +h4 {font-size:1.2em;line-height:1.25;margin-bottom:1.25em;} +h5 {font-size:1em;font-weight:bold;margin-bottom:1.5em;} +h6 {font-size:1em;font-weight:bold;} +h1 img, h2 img, h3 img, h4 img, h5 img, h6 img {margin:0;} +p {margin:0 0 1.5em;} +.left {float:left !important;} +p .left {margin:1.5em 1.5em 1.5em 0;padding:0;} +.right {float:right !important;} +p .right {margin:1.5em 0 1.5em 1.5em;padding:0;} +a:focus, a:hover {color:#09f;} +a {color:#06c;text-decoration:underline;} +blockquote {margin:1.5em;color:#666;font-style:italic;} +strong, dfn {font-weight:bold;} +em, dfn 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+ else if (val >= 1000000) + return (val / 1000000).toFixed(prec) + " MB"; + else if (val >= 1000) + return (val / 1000).toFixed(prec) + " kB"; + else + return val.toFixed(prec) + " B"; + } + + function formatRate(val, prec) { + if (val == null) + return "N/A" + + return formatSuffix(val, prec) + "/s"; + } + + function formatPercent(val, prec) { + if (val == null) + return "N/A" + + var prec = prec || 1; + return val.toFixed(prec) + " %" + } + + // Set up polling interval control + var updateInterval = 1000; // ms + $("#updateInterval").val(updateInterval).change(function () { + updateInterval = $(this).val(); + }); + + // Allow the UI to be paused + var paused = false; + $('#pause-ui').click(function() { + if (paused) { + $(this).text("Pause UI"); + paused = false; + } else { + $(this).text("Unpause UI"); + paused = true; + } + }); + + // Plot formatters + function suffixFormatter(val, axis) { + return formatSuffix(val, axis.tickDecimals); + } + + function rateFormatter(val, axis) { + return formatRate(val, axis.tickDecimals); + } + + function percentFormatter(val, axis) { + return formatPercent(val, axis.tickDecimals); + } + + // Fetch data periodically and notify interested parties. + var listeners = []; + var fetchData = function() { + function onDataReceived(stats) { + var now = new Date().getTime(); + for(var i = 0; i < listeners.length; i++) + listeners[i](stats, now); + } + + $.ajax({ + url: "/", + dataType: 'json', + success: onDataReceived, + cache: false + }); + + setTimeout(fetchData, updateInterval); + }; + fetchData(); + + function addPlot(elem, series, opts) { + var defaultOptions = { + series: { shadowSize: 0 }, // drawing is faster without shadows + xaxis: { mode: "time", tickSize: [10, "second"] } + }; + var options = $.extend(true, {}, defaultOptions, opts) + var data = new Array(series.length); + var maxPoints = 60; + for(var i = 0; i < series.length; i++) + data[i] = []; + + var plot = $.plot(elem, [], options); + + var prev_stats, prev_time; + function onDataReceived(stats, time) { + for(var i = 0; i < series.length; i++) { + if (data[i].length >= maxPoints) + data[i] = data[i].slice(1); + + data[i].push([time, series[i].fn(stats, time, + prev_stats, prev_time)]); + } + + // zip lengends with data + res = [] + for(var i = 0; i < series.length; i++) + res.push({ label: series[i].label, data: data[i] }); + + if (!paused) { + plot.setData(res); + plot.setupGrid(); + plot.draw(); + } + prev_stats = stats; + prev_time = time; + } + + listeners.push(onDataReceived); + } + + function addCounter(elem, fn, formatter) { + var prev_stats, prev_time; + function onDataReceived(stats, time) { + if (!paused) + elem.text(formatter(fn(stats, time, prev_stats, prev_time))); + prev_stats = stats; + prev_time = time; + } + + listeners.push(onDataReceived); + } + + $(document).ready(function() { + // Metrics + var current_bytes_used = function(stats) { return stats.current_bytes_used }; + var max_bytes_used = function(stats) { return stats.max_bytes_used }; + var max_bytes_slop = function(stats) { return stats.max_bytes_slop }; + var current_bytes_slop = function(stats) { return stats.current_bytes_slop }; + var productivity_wall_percent = function(stats, time, prev_stats, prev_time) { + if (prev_stats == undefined) + return null; + var mutator_seconds = stats.mutator_wall_seconds - + prev_stats.mutator_wall_seconds; + var gc_seconds = stats.gc_wall_seconds - prev_stats.gc_wall_seconds; + return 100 * mutator_seconds / (mutator_seconds + gc_seconds); + } + var productivity_cpu_percent = function(stats, time, prev_stats, prev_time) { + if (prev_stats == undefined) + return null; + var mutator_seconds = stats.mutator_cpu_seconds - + prev_stats.mutator_cpu_seconds; + var gc_seconds = stats.gc_cpu_seconds - prev_stats.gc_cpu_seconds; + return 100 * mutator_seconds / (mutator_seconds + gc_seconds); + } + var allocation_rate = function(stats, time, prev_stats, prev_time) { + if (prev_stats == undefined) + return null; + return 1000 * (stats.bytes_allocated - prev_stats.bytes_allocated) / + (time - prev_time); + } + + // Plots + addPlot($("#current-bytes-used-plot"), + [{ label: "residency", fn: current_bytes_used }], + { yaxis: { tickFormatter: suffixFormatter } }); + addPlot($("#allocation-rate-plot"), + [{ label: "rate", fn: allocation_rate }], + { yaxis: { tickFormatter: rateFormatter } }); + addPlot($("#productivity-plot"), + [{ label: "wall clock time", fn: productivity_wall_percent }, + { label: "cpu time", fn: productivity_cpu_percent }], + { yaxis: { tickDecimals: 1, tickFormatter: percentFormatter } }); + + // Counters + addCounter($("#max-bytes-used"), max_bytes_used, formatSuffix) + addCounter($("#current-bytes-used"), current_bytes_used, formatSuffix) + addCounter($("#max-bytes-slop"), max_bytes_slop, formatSuffix) + addCounter($("#current-bytes-slop"), current_bytes_slop, formatSuffix) + addCounter($("#productivity-wall"), productivity_wall_percent, formatPercent) + addCounter($("#productivity-cpu"), productivity_cpu_percent, formatPercent) + addCounter($("#allocation-rate"), allocation_rate, formatRate) + }); +});