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Alex Rivera
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How fast is accessing a thread local variables in Linux. From the code generated by the gcc compiler, I can see that is uses the fs segment register. So apparently, the access to the thread local variable should not cost extra cycles. However, I keep on reading horror stories about the slowness of thread local variable access. How come? Sure, sometimes different compilers use a different approach than using fs segment register, but is accessing thread local variable through fs segment register slow too?
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