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Asked: 2026-06-18T11:43:22+00:00

I have a java program which extracts some files onto client machine. I have

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I have a java program which extracts some files onto client machine. I have implemented 4 threads to extract files. But thread implementation barely effecting the extraction time. I have checked thread execution in jvisualvm, it looks fine and I am sure that threads are implemented parallel fashion . Here is my system configuration…

Windows XP, Core2duo, 3GB RAM.
java-vm-args : -Xmx512M -Xss2M.
I have printed available processors to the running JVM…
Runtime.getRuntime().availableProcessors() = 1( If I am not wrong it should execute 2 logical threads).

Am I missing something? How can we assure that threads are running parallel at Hardware level?

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  1. Editorial Team

    Parallel execution helps when CPU is bottleneck. In your case bottleneck is probably I/O, not CPU. Also, you have 1 physical core with hyper-threading. In this case parallel execution will probably not help anyway, even when CPU is bottleneck. Moreover, in some situations, two-threaded application may be slower on single-core, hyper-threading CPU than single-threaded application. Hyper-threading is mostly marketing trick. Do not rely on it.

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