jmaps

#!/bin/bash # # jmaps - creates java /tmp/perf-PID.map symbol maps for all java processes. # # This is a helper script that finds all running "java" processes, then executes # perf-map-agent on them all, creating symbol map files in /tmp. These map files # are read by perf_events (aka "perf") when doing system profiles (specifically, # the "report" and "script" subcommands). # # USAGE: jmaps [-u] # -u # unfoldall: include inlined symbols # # My typical workflow is this: # # perf record -F 99 -a -g -- sleep 30; jmaps # perf script > out.stacks # ./stackcollapse-perf.pl out.stacks | ./flamegraph.pl --color=java --hash > out.stacks.svg # # The stackcollapse-perf.pl and flamegraph.pl programs come from: # https://github.com/brendangregg/FlameGraph # # REQUIREMENTS: # Tune two environment settings below. # # 13-Feb-2015 Brendan Gregg Created this. # 20-Feb-2017 " " Added -u for unfoldall. JAVA_HOME=/usr/lib/jvm/java-8-oracle AGENT_HOME=/usr/lib/jvm/perf-map-agent # from https://github.com/jrudolph/perf-map-agent debug=0 if [[ "$USER" != root ]]; then echo "ERROR: not root user? exiting..." exit fi if [[ ! -x $JAVA_HOME ]]; then echo "ERROR: JAVA_HOME not set correctly; edit $0 and fix" exit fi if [[ ! -x $AGENT_HOME ]]; then echo "ERROR: AGENT_HOME not set correctly; edit $0 and fix" exit fi if [[ "$1" == "-u" ]]; then opts=unfoldall fi # figure out where the agent files are: AGENT_OUT="" AGENT_JAR="" if [[ -e $AGENT_HOME/out/attach-main.jar ]]; then AGENT_JAR=$AGENT_HOME/out/attach-main.jar elif [[ -e $AGENT_HOME/attach-main.jar ]]; then AGENT_JAR=$AGENT_HOME/attach-main.jar fi if [[ -e $AGENT_HOME/out/libperfmap.so ]]; then AGENT_OUT=$AGENT_HOME/out elif [[ -e $AGENT_HOME/libperfmap.so ]]; then AGENT_OUT=$AGENT_HOME fi if [[ "$AGENT_OUT" == "" || "$AGENT_JAR" == "" ]]; then echo "ERROR: Missing perf-map-agent files in $AGENT_HOME. Check installation." exit fi # Fetch map for all "java" processes echo "Fetching maps for all java processes..." for pid in $(pgrep -x java); do mapfile=/tmp/perf-$pid.map [[ -e $mapfile ]] && rm $mapfile cmd="cd $AGENT_OUT; $JAVA_HOME/bin/java -Xms32m -Xmx128m -cp $AGENT_JAR:$JAVA_HOME/lib/tools.jar net.virtualvoid.perf.AttachOnce $pid $opts" (( debug )) && echo $cmd user=$(ps ho user -p $pid) if [[ "$user" != root ]]; then # make $user the username if it is a UID: if [[ "$user" == [0-9]* ]]; then user=$(awk -F: '$3 == '$user' { print $1 }' /etc/passwd); fi cmd="sudo -u $user sh -c '$cmd'" fi echo "Mapping PID $pid (user $user):" if (( debug )); then time eval $cmd else eval $cmd fi if [[ -e "$mapfile" ]]; then chown root $mapfile chmod 666 $mapfile else echo "ERROR: $mapfile not created." fi echo "wc(1): $(wc $mapfile)" echo done