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0 parents commit dbb3000ae3b35a595519b126f627747f940e23f2 John Kalucki committed Dec 29, 2009
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  1. +202 −0 LICENSE
  2. +19 −0 README
  3. +107 −0 bin/jvm-gc-stats.rb
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@@ -0,0 +1,19 @@
+A Ruby script to parse the output from the Java Virtual Machine
+(JVM) garbage collection trace output, push the data into Ganglia
+and alert on anomolies. The data and graphs produced are intended
+to support operational monitoring of production processes and for
+to also inform GC tuning decisions.
+The JVM is assumed to be Java6 and invoked with the following flags:
+-XX:+UseConcMarkSweepGC -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps
+Currently this script is a rough prototype written by a Ruby neophyte
+in a rush to get data. Be gentle.
+Apache 2.0 License. See included license file.
107 bin/jvm-gc-stats.rb
@@ -0,0 +1,107 @@
+# jvm-gc-stats: gather stats from jvm garbage collection trace and publish ganglia graphs
+$debug = true
+$tailSleepSec = 1
+$tailBlockSize = 2048
+def tail(file)
+ f =, "r")
+ lines = ""
+ loop do
+ begin
+ # Limit reads to prevent loading entire file into memory if not seeking to end
+ begin
+ part = f.read_nonblock($tailBlockSize)
+ rescue
+ part = nil
+ end
+ if part == nil then
+ # End of file reached, wait for more data
+ sleep $tailSleepSec
+ else
+ lines += part
+ end
+ end until lines["\n"]
+ # If there isn't a null trailing field, last string isn't newline terminated
+ split = lines.split("\n", $tailBlockSize)
+ if split[-1] == "" then
+ # Remove null trailing field
+ split.pop
+ lines = ""
+ else
+ # Save partial line for next round
+ lines = split.pop
+ end
+ split.each { |line|
+ ingest(line)
+ }
+ end
+$minor ='ParNew: (\d+)K->(\d+).*?user=(\d+.\d+).*?real=(\d+.\d+)')
+$fail ='fail')
+$cmsStart ='\[CMS-concurrent.*start\]')
+$cmsConcurrent ='CMS-concurrent.*?user=(\d+.\d+).*?real=(\d+.\d+)')
+$cmsBlock ='CMS-(initial-|re)mark.*?user=(\d+.\d+).*?real=(\d+.\d+)')
+$startup ='^Heap$|^ par new generation|^ eden space|^ from space|^ to space|^ concurrent mark-sweep generation|^ concurrent-mark-sweep perm')
+def ingest(str)
+ case str
+ when $minor
+ fromK = $~[1].to_i
+ toK = $~[2].to_i
+ deltaK = fromK - toK
+ ratio = toK.to_f / fromK.to_f
+ userSec = $~[3].to_f
+ realSec = $~[4].to_f
+ kPerRealSec = deltaK / realSec
+ kPerUserSec = deltaK / userSec
+ if $debug then
+ printf("minor ratio %4f kPerUserSec %8d kPerRealSec %8d user %5f real %5f\n",
+ ratio, kPerUserSec, kPerRealSec, userSec, realSec)
+ end
+ report("minor.survivalRatio", ratio)
+ report("minor.kbytesPerSec", kPerRealSec)
+ report("minor.userSec", userSec)
+ report("minor.realSec", realSec)
+ when $fail
+ puts "FAIL #{str}" if $debug
+ report("fail", 1)
+ when $cmsStart
+ puts "ignore cms start #{str}" if $debug
+ when $cmsConcurrent
+ userSec = $~[1].to_f
+ realSec = $~[2].to_f
+ printf "major concurrent user %5f real %5f %s\n", userSec, realSec, str if $debug
+ report("major.concur.userSec", userSec)
+ report("major.concur.realSec", realSec)
+ when $cmsBlock
+ userSec = $~[2].to_f
+ realSec = $~[3].to_f
+ printf "major block user %5f real %5f %s\n", userSec, realSec, str if $debug
+ report("major.block.userSec", userSec)
+ report("major.block.realSec", realSec)
+ when $startup
+ puts "ignore startup #{str}" if $debug
+ else
+ puts "UNMATCHED #{str}"
+ end
+def report(key, value)
+ exec = "gmetric -tfloat -njvm.gc.#{key} -v#{value}"
+ system(exec)
+if (ARGV[0]) then
+ filename = ARGV[0]
+ filename = "stdout"

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