Merge pull request #452 from cloudfoundry/enableGCLogging

add gc logging option

.travis.yml

@@ -21,7 +21,7 @@ matrix:
       env: COMMAND=rake
     - rvm: "2.3.1"
       env: COMMAND=rake
-install:
+install: 
     - gem install bundler:1.17.3 
     - bundle install --deployment --without debug
 script: bundle exec $COMMAND

Gemfile.lock

@@ -70,4 +70,4 @@ DEPENDENCIES
   yard
 
 BUNDLED WITH
-   1.17.3
+   1.17.3 

lib/liberty_buildpack/jre/ibmjdk.rb

@@ -76,7 +76,6 @@ def compile
         print "\nYou have not accepted the IBM JVM License.\n\nVisit the following uri:\n#{@license}\n\nExtract the license number (D/N:) and place it inside your manifest file as a ENV property e.g. \nENV: \n  IBM_JVM_LICENSE: {License Number}.\n"
         raise
       end
-
       ibm_var = ' IBM'
       download_start_time = Time.now
       if @uri.include? '://'
@@ -105,6 +104,9 @@ def release
       @java_opts << '-Xshareclasses:none'
       @java_opts << '-XX:-TransparentHugePage'
       @java_opts << "-Xdump:tool:events=systhrow,filter=java/lang/OutOfMemoryError,request=serial+exclusive,exec=#{@common_paths.diagnostics_directory}/#{KILLJAVA_FILE_NAME}"
+      unless @java_opts.include? '-Xverbosegclog'
+        @java_opts << '-Xverbosegclog:/home/vcap/logs/verbosegc.%pid.%seq.log,5,10000'
+      end
     end
 
     private

lib/liberty_buildpack/jre/openj9.rb

@@ -68,6 +68,9 @@ def release
       @java_opts.concat memory_opts
       @java_opts.concat default_dump_opts
       @java_opts << '-Xshareclasses:none'
+      unless @java_opts.include? '-Xverbosegclog'
+        @java_opts << '-Xverbosegclog:/home/vcap/logs/verbosegc.%pid.%seq.log,5,10000'
+      end
       @java_opts << "-Xdump:tool:events=systhrow,filter=java/lang/OutOfMemoryError,request=serial+exclusive,exec=#{@common_paths.diagnostics_directory}/#{KILLJAVA_FILE_NAME}"
     end
 

lib/liberty_buildpack/jre/openjdk.rb

@@ -80,6 +80,9 @@ def compile
     # @return [void]
     def release
       @version = OpenJdk.find_openjdk(@configuration)[0]
+      unless @java_opts.include? '-Xloggc'
+        @java_opts << '-Xloggc:/home/vcap/logs/verbosegc_%p.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=20M'
+      end
       @java_opts << "-XX:OnOutOfMemoryError=#{@common_paths.diagnostics_directory}/#{KILLJAVA_FILE_NAME}"
       memory
     end