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xx    
b.不可分离

b.不可分离

xx
adj 1: denoting a quantity consisting of 20 items or units [synonym:
{twenty}, {20}, {xx}]
n 1: the cardinal number that is the sum of nineteen and one
[synonym: {twenty}, {20}, {XX}]
2: (genetics) normal complement of sex chromosomes in a female

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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
  • c++ - . c vs . cc vs. . cpp vs . hpp vs . h vs . cxx - Stack Overflow
    Possible Duplicates: * h or * hpp for your class definitions What is the difference between cc and cpp file suffix? I used to think that it used to be that: h files are header files for C and C
  • 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
  • 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
  • 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
  • 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?
  • 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??
  • jvm hotspot - Does Javas ActiveProcessorCount limit the number of CPUs . . .
    $ java -XX:ActiveProcessorCount=20 -cp Main Runtime getRuntime() availableProcessors() = 20 This also worked on the latest version of Java 8, specifically OpenJDK 1 8 0_242-b08 As already noted, this helps size thread pools but does not impose any hard limit on the number of CPU cores that can be used
  • 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 is a regular expression for a MAC Address? - Stack Overflow
    As an aside, the quote above concerning "standard format" comes from Wikipedia, not the 802 3 standards body IEEE 802-2014 actually specifies hyphens for ordinary MAC addresses (§ 8 1 ¶ 3) and colons for the obsolescent bit-reversed notation (¶ 4) Importantly, in practice, no one observes this We simply use one or the other, but never mix them in a single written MAC





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