Multithread causing cache line migration between the CPUs

hi, i have a problem with Sun JVM 1.5.0_15, with the Linux Scheduler in a SMP kernel 2.6, that make individual threads actually move from processor to processor even though they are in a continuous running state and never sleep, causing cache line migration between the CPUs, this slow down perfomance of multithread java applications, that in a Single CPU is faster than Dual CPU, any idea?
KR
Cl�vis

Sun's JVM (HotSpot) doesn't do any thread scheduling, it leaves it up to the operating system. So the o/s is choosing to migrate threads. The obvious things for slowing down a multi-threaded app are lock contention or possibly garbage collection (multiple CPUs allow more work to get done, which means more heap allocation and more frequent GCs if using the same heap size as a single CPU box).

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Packed 17/04/11 Posted 18/04/11
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Multithread causing cache line migration between the CPUs

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