Built-in generator of Flame Graphs in SVG format

[apangin]

• New output format: -o svg
• Automatically choose output format depending on file extension
• Removed references to flamegraph.pl

[goldshtn]

Looks great!

[apangin]

Thank you for review!

[rockiee281]

With -f flame.svg ,no output int flame.svg but something like 'Stopped profiling after 30 seconds'.

Without '-f' option, I can get the load trace normally.

env: Centos 7.2, jdk8 with hotspot, 32G memory with G1, build the async-profiler from master

[apangin]

@rockiee281 I guess an older version of libasyncProfiler.so had been already loaded into Java process before you started profiling with a new version. Can it be the case?

[rockiee281]

Hi, I build a fresh aysnc-profiler from source, and never use this tools before so I think there won't be any libasyncProfiler.so load by java process before

[rockiee281]

Anyway , now I use the old way to generate colloapsed tarce file and make flame graph by flamegraph.pl . This is really great tool, thanks

[apangin]

@rockiee281 Hmm. -f flame.svg is also supposed to work. If it does not - it is a bug that I'd like to fix. If you can easily reproduce the problem, could you please add the following echo line to see the full jattach command issued by profiler.sh? Thanks.

diff --git a/profiler.sh b/profiler.sh
index 644a25b..d389950 100755
--- a/profiler.sh
+++ b/profiler.sh
@@ -45,6 +45,7 @@ check_if_terminated() {
 }

 jattach() {
+    echo $JATTACH $PID load "$PROFILER" true $1
     $JATTACH $PID load "$PROFILER" true $1 > /dev/null
     RET=$?

[rockiee281]

@apangin this output 2 lines：
./build/jattach 134836 load /<dir_where_build>/async-profiler/build/libasyncProfiler.so true start,event=cpu,file=flame1.svg,svg
./build/jattach 134836 load /<dir_where_build>/async-profiler/build/libasyncProfiler.so true stop,file=flame1.svg,svg

And this time it works well. I think its my mistake. Thanks you 👍