On Tue, Jan 3, 2012 at 5:02 AM, Yaroslav <yaro...@gmail.com> wrote: > > Interesting observation: removing __thread storage class makes thread data > shared by all threads. Even without any locks concurrent modifications of > the same memory area result in 5-10 fold test time increase. I.e., shared > variable write is about 5-10 times slower than non-shared even without any > locks. >
I assume you mean concurrent writes of course. Implicitly shared memory between threads should have regular access time when there's no false sharing with other threads writing to nearby memory.
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