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- c++ - . c vs . cc vs. . cpp vs . hpp vs . h vs . cxx - Stack Overflow
Historically, the first extensions used for C++ were c and h, exactly like for C This caused practical problems, especially the c which didn't allow build systems to easily differentiate C++ and C files
- 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-XX:MaxPermSize=size Sets the maximum permanent generation space size This option was deprecated in JDK 8, and superseded by the -XX:MaxMetaspaceSize option Sizes are expressed in bytes Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to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?
- 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
- What are the -Xms and -Xmx parameters when starting JVM?
The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool
- Increase heap size in Java - Stack Overflow
-XX:MaxRAMPercentage=percent The MaxRAMPercentage parameter allows setting the maximum heap size for a JVM running with a large amount of memory (greater than 200 MB) This is the option that can be used for the case mentioned in the question:-XX:MaxRAMPercentage=75 -XX:MinRAMPercentage=percent
- Mockito is currently self-attaching to enable the inline-mock-maker . . .
I added the above XML snippet to my pom xml and added the argument -XX:+EnableDynamicAgentLoading to the VM parameters All warnings were cleared except the first line Mockito is currently self-attaching to enable the inline-mock-maker The XML snippets didn't have any effect Any help would be appreciated –
- How to properly set the G1GC options for a server with 22G heap
1> What -XX:G1HeapRegionSize should be ? Must the number be a power of two? If so, should I set 8M to get 2816 regions, or set 16M to get 1408 regions ? 2> Do you think we should explicitly set -XX:ParallelGCThreads and -XX:ConcGCThreads ? If they are omitted, will they be set to a default number according to the server logical processors ?
- how to increase java heap memory permanently? - Stack Overflow
There is also parameter -XX:MaxPermSize=256m which changes memory reserved for permanent generation If your application runs as windows service, in Control panels -> Administration tools -> Services you can add some run parameters to your service
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