I am creating heap dump using below command: jmap -dump:file=DumpFile.txt <process-id> I have opened the generated file - DumpFile.txt but it is not in readable format. So please let me kn...

I am trying to analyse a heap dump taken from a java process that ran into memory issues. The dump was taken using jmap. I am using jhat on the dump file - I am getting java.io.IOException: Unrec...

I have generated a heap dump from my java application which has been running for some days with the jmap tool -> this results in a large binary heap dump file. How can I perform memory analysis of...

So I am looking at a heap with jmap on a remote box and I want to force garbage collection on it. How do you do this without popping into jvisualvm or jconsole and friends? I know you shouldn't be...

When I use jmap to get the heap info about a process, I got error like that: $jmap -heap process_id Attaching to process ID process_id, please wait... Error attaching to process: sun.jvm.hotspot....

I understand the difference between new gen / old gen /perm gen, but I don't know what "To Space" and "From Space" are. I am seeing my "From Space" hitting 99.8% used while the "To Space" always se...

When I ran below jmap command: jmap -histo 14104 I am able to see very nice output of my objects, there instances, bytes used. num #instances #bytes class name --------------------------------...

I am trying to take heap dump using below 2 commands jcmd $pid GC.heap_dump /tmp/filename.dump jmap -dump:format=b,file=/tmp/filename.dump $pid jcmd produces file size of ~300M and jmap produc...

jmap help shows: ... -dump:<dump-options> to dump java heap in hprof binary format dump-options: live dump only live objects; if not specified, all objects in the heap are dumped. ....

In few circumstance, our application is using around 12 GB of memory. We tried to get the heap dump using jmap utility. Since the application is using some GB of memory it causes the application to...

Using jmap on Ubuntu Mate 18.04-64bits with Oracle JDK 10.0.1-64bits, the tool works only when running both the target and the tool as root, but using the same normal user for running both gives th...

I'm on ubuntu, and I need to confirm the heap size setting is being used by tomcat. How can I do that? I tried jmap but that doesn't seem to be on the server, can I download it individually someh...

I get the following exception when i take a heapdump using jmap -F -dump:format=b,file=/tmp/heapdump/before.hprof 10737 Attaching to process ID 10737, please wait... Exception in thread "main" j...

Long story short, some coworkers are running a pretty old setup(oc4j jdk1.5.6 in x86_64) with an application which happens to be mission critical. They recently have tried to deploy a new version o...

Problem We are trying to find the culprit of a big memory leak in our web application. We have pretty limited experience with finding a memory leak, but we found out how to make a java heap dump u...

We recently had one of our JVM's crash, leaving behind a core dump file produced by the gcore command. We want to have a look at the contents of the file and find out exactly what caused the crash....

I troubleshoot a weird memory leak. It's specific to Java8, not happening on 7u79. I don't have access to Java code. I know exactly which user action causes a leak, I know the leak is about the cl...

Does my java application continue running while jmap is taking its memory dump?

I want to figure out why JVM heap usage on Elasticsearch node is staying consistently above 80%. In order to do this, I take a heap dump by running jmap.exe -heap:format=b 5348 (5348 is the Proc...

We are working over our client's production server heap to detect and solve memory leaks. For this we are using jmap periodically to collect the necessary information. But last week we couldn't ta...

Had a Java core dump; running jmap with: /usr/java/jdk1.8.0_25/bin/jmap -dump:format=b,file=dump.hprof /usr/bin/java core.31497 Gives the following exception: Attaching to core core.31497 from...

Using the tool jmap, you can create a memory dump in two formats: Binary format: jmap -dump:format=b,file=binary_dump.dat <pid> or Other format: jmap -dump:file=other_format_dump.dat &lt...

We have java streaming server running in production and it requires ~10GB of RAM for operation so we have 32GB installed. Memory is gradually increased until limit is reached and out-of-memory exce...

I'm trying to troubleshoot a permgen leak, and wanted to ask you folks for your opinions on how to interpret the output from jmap -permstat. Let's say that I have a jmap -permstat report, like thi...

I have a java program which keeps calling java.util.zip to compress/decompress data. It runs out of memory within a few seconds. I had a memory dump with jmap and I'm viewing it with jhat. Finalize...