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Wednesday, February 28, 2018
Poonam Parhar
StackOverflowError and threads waiting for ReentrantReadWriteLock
If the terms 'Stuck Threads' or 'Hang' sound familiar and scary
to you, please read on. We can sometimes come across situations
where the Weblogic Server (WLS)...
Monday, December 11, 2017
Poonam Parhar
Can young generation size impact the application response times?
I was recently involved in a performance issue where the
application's response times were decreasing over time, and I was
tasked to determine if GC was playing...
Tuesday, November 14, 2017
Poonam Parhar
Clarifying some confusion around Java Flight Recordings
In this blog, I am going to talk about two confusions around
Java Flight Recordings that I have come across from multiple
users/customers. Let's take a look at...
Wednesday, May 10, 2017
Poonam Parhar
How do I find what's getting promoted to my old generation?
This question comes up every now and then that how can I find
what the minor/young collections are promoting to the old
generation of my Java application....
Thursday, April 27, 2017
Poonam Parhar
HotSpot JVM throwing OOM even when there is memory available
I was recently asked a question that why my Java application
runs out of Java Heap when there is still so much memory available
to use?
Here is the question in...
Thursday, February 16, 2017
Poonam Parhar
WeakReferences and GC
I was recently working on a memory growth issue involving
WeakReferences, and I came across this great blog post on how
non-strong references can affect the...
Wednesday, November 2, 2016
Poonam Parhar
Hung JVM due to the threads stuck in pthread_cond_timedwait()
In this post, I am going to discuss a couple of scenarios where
the Java process hangs are actually NOT because of a Java/JVM issue
but happen due to the OS...
Thursday, October 27, 2016
Poonam Parhar
G1 and Flight Recorder's -XX:FlightRecorderOptions=stackdepth option
Recently there was a report from a customer that they observed
performance degradation while using JFR with G1 when they used it
along with...
Wednesday, September 28, 2016
Poonam Parhar
Crashes in ZIP_GetEntry
Recently, received quite a few reports of the application crashes
from different customers and product groups with the stack trace
looking like this:
Stack:...