Heap profiling for MacOS not working

[airas-careem]

I have tried to experiment with heap profiling using jemalloc. I have cloned the repo, and built the library with the following steps

./autogen.sh
./configure --enable-prof
make
sudo make install

It did build the library and I confirmed with visiting /usr/local/lib for libjemalloc.dylib & /usr/local/bin for jeprof.

Now the issue is If I run my jar using

LD_PRELOAD=/usr/local/lib/libjemalloc.dylib \ MALLOC_CONF=prof:true,lg_prof_interval:1,lg_prof_sample:1,prof_prefix:/Users/airas/jeprof \ java -Dserver.port=8081 -XX:NativeMemoryTracking=summary -XX:+UnlockDiagnosticVMOptions -XX:+PrintNMTStatistics -XX:+CrashOnOutOfMemoryError -XX:CompressedClassSpaceSize=128m -XX:MinRAMPercentage=15.0 -XX:MaxRAMPercentage=15.0 -XX:InitialRAMPercentage=15.0 -XX:+UseG1GC -Dfile.encoding=UTF8 -Dserver.undertow.worker-threads=32 -Dserver.undertow.io-threads=4 -jar ./services/sender/target/sender-fat-exec.jar

I still do not see any heap dump file. I verified the permissions too, user is the same for the java process & directory where the heap file should be created.

[guangli-dai]

This PR should solve the problem. It hasn't merged yet but should be soon.

[airas-careem]

Thanks @guangli-dai. I will use the PR branch for later. I have now run my service in a container to generate heap files.

Also, I got two questions,

Q1: Can we manually create a heap file at any instance without service generating too many/few heap files? I would like to have a command that just generates a heap at that instance.

Q2: Currently I am generating a graph with the below command, is there a way I can just get a text report like we get in jcmd NMT report?

jeprof --show_bytes --gif /usr/local/openjdk-11/bin/java jeprof.8.3.i3.heap > output.gif