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r4um/jvmrap.md

Created May 19, 2017 12:29
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jvm rap
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jvmrap.md 
  ⚡ cat RAvailableProcessors.java 
public class RAvailableProcessors {
    public static void main(String[] args) {
        Runtime runtime = Runtime.getRuntime();
        int numberOfProcessors = runtime.availableProcessors();
        System.out.println(numberOfProcessors);
    }
}

⚡ java RAvailableProcessors 
8
⚡ env LDHS_SC_NPROCESSORS_CONF="3" LD_PRELOAD=/home/cpk/src/c/ldhook-sysconf/ldhook-sysconf.so java RAvailableProcessors
3
⚡ env LDHS_SC_NPROCESSORS_CONF="3" LD_PRELOAD=/home/cpk/src/c/ldhook-sysconf/ldhook-sysconf.so java -server RAvailableProcessors
3
⚡ env LDHS_SC_NPROCESSORS_CONF="3" LD_PRELOAD=/home/cpk/src/c/ldhook-sysconf/ldhook-sysconf.so java -client RAvailableProcessors
3
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