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Difference between -XX:+UseParallelGC and -XX:+UseParNewGC 3 Using -XX:+UseParNewGC along with -XX:+UseConcMarkSweepGC, will cause higher pause time for Minor GCs, when compared to -XX:+UseParallelGC This is because, promotion of objects from Young to Old Generation will require running a Best-Fit algorithm (due to old generation fragmentation) to find an address for this object
Difference between Xms and Xmx and XX:MaxPermSize -XX:MaxPermSize=size Sets the maximum permanent generation space size This option was deprecated in JDK 8, and superseded by the -XX:MaxMetaspaceSize option Sizes are expressed in bytes Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes References: How is the java memory pool divided?
Is -XX:+UseG1GC the correct replacement for -Xincgc? So what's the equivalent replacement for it? -XX:+UseG1GC? Background: The application has a heap of 8GB and creates a lot of short living objects I noticed that it often paused for some seconds to do garbage collection Out of curiosity I added the -Xincgc and found that the pauses were gone and overall performance improved ~4 times
Regular Expression to validate xx-xxxxxxx or xxx-xx-xxxx string1 = xxx-xx-xxxx or string1 = xx-xxxxxxx How can I make the regex accept both kinds of values for the same element? The x's represent numbers only so total number of digits = 9 (anything between 0-9) total number of elements in the value is either 11 or 10 depending on which format and total number of dashes is either 2 or 1
java - Where dump is dumped, using . . . - Stack Overflow I found it hard to decipher what is meant by "working directory of the VM" In my example, I was using the Java Service Wrapper program to execute a jar - the dump files were created in the directory where I had placed the wrapper program, e g c:\myapp\bin The reason I discovered this is because the files can be quite large and they filled up the hard drive before I discovered their location
JVM flag -XX:+UnlockExperimentalVMOptions, is this removed from the . . . $ java -XX:+PrintFlagsFinal -version | grep UnlockExperimentalVMOptions openjdk version "1 8 0_265" OpenJDK Runtime Environment (build 1 8 0_265-8u265-b01-0ubuntu2~20 04-b01) OpenJDK 64-Bit Server VM (build 25 265-b01, mixed mode) Is the flag UnlockExperimentalVMOptions removed or Am I doing something wrong or what??
Setting -XX:+DisableExplicitGC in production: what could go wrong? You are not alone in fixing stop-the-world GC events by setting the -XX:+DisableExplicitGC flag Unfortunately (and in spite of the disclaimers in the documentation), many developers decide they know better than the JVM when to collect memory and introduce exactly this type of issue I'm aware of many instances where the -XX:+DisableExplicitGC improved the production environment and zero
Java - shutting down on Out of Memory Error - Stack Overflow But I suggest you too use -XX:+HeapDumpOnOutOfMemoryError, this way the JVM will create a memory dump file with the content of your application once the event was produced You will use a profiles, I recommend you Eclipse MAT to investigate the image This way you will find pretty quickly what is the cause of the issue, and react properly