Examples of dev.benchmarks.MemoryBarrierBenchMark

dev.benchmarks.MemoryBarrierBenchMark

This class obtains the Benchmark results for the JMM Memory Barrier Memory barriers are used to achieve visibility. A mutex is a lock. A program can behave non-deterministically when memory operations on shared mutable state are re-ordered. A thread may write values that become visible to another thread in ways that are inconsistent with the order in which they were written. A properly placed memory barrier prevents this. In the Java Memory Model a volatile field has a store barrier inserted after a write to it and a load barrier inserted before a read of it. Qualified final fields of a class have a store barrier inserted after their initialization. Atomic instructions, are effectively a full barrier as they lock the memory sub-system to perform an operation and have guaranteed total order, even across CPUs. Software locks usually employ memory barriers, or atomic instructions, to achieve visibility and preserve program order. @counterAtomic AtomicInteger field for comparison with non atomic fields @compareInLineToBarrier() memory barrier set up by a method call compared to a no barrier operation

    
    synchBenchMark.syncMethod();
    synchBenchMark.syncCodeBlock();
    synchBenchMark.syncCodeBlockWithVolatile();
    
    MemoryBarrierBenchMark  memoryBarrierBenchMark   =  new  MemoryBarrierBenchMark ();
    memoryBarrierBenchMark.compareSynchronizedToBarrier();
    memoryBarrierBenchMark.compareInLineToBarrier();
    
    
    // looks at size of empty collections using ManagementXBean amd Runtime
    MemoryTest mtest = new MemoryTest();
    mtest.genericCollectionAnalyzer();

    SynchronizerBenchMark  synchBenchMark   =  new  SynchronizerBenchMark ();
    synchBenchMark.syncMethod();
    synchBenchMark.syncCodeBlock();
    synchBenchMark.syncCodeBlockWithVolatile();
    
    MemoryBarrierBenchMark  memoryBarrierBenchMark   =  new  MemoryBarrierBenchMark ();
    memoryBarrierBenchMark.compareSynchronizedToBarrier();
    memoryBarrierBenchMark.compareInLineToBarrier();
    
    
    MemoryTest mtest = new MemoryTest();
    mtest.genericCollectionAnalyzer();
      }

Examples of dev.benchmarks.MemoryBarrierBenchMark

Related Classes of dev.benchmarks.MemoryBarrierBenchMark