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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-XX:MaxPermSize=size Sets the maximum permanent generation space size This option was deprecated in JDK 8, and superseded by the -XX:MaxMetaspaceSize option Sizes are expressed in bytes Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to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
jboss - java. lang. OutOfMemoryError: Metaspace - -XX:MaxMetaspaceSize . . . Since we are getting java lang OutOfMemoryError: Metaspace we have planned to increase the -XX:MaxMetaspaceSize size Question: Currently we are using 6GB of RAM in the Server and if we want to increase the size for -XX:MaxMetaspaceSize, what is the maximum value we can set?
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??
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 - 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