Another performance problem

bearophile bearophileHUGS at
Sun Dec 8 15:06:34 PST 2013

David Nadlinger:

> I did, however, find a rather severe bug: We emit the "__gshared
> static" globals in the MemoryPool struct as thread-local, which 
> is a)
> a big correctness problem, and b) might cause substantial 
> slowdown due
> to the additional overhead incurred when accessing them.

Usually not adding the "__gshared" annotation with DMD doesn't 
cause a significant slowdown of the code.

> Looking at the IR generated on Linux, I can't see any obvious 
> big
> performance issues (such as e.g. GC allocations where there 
> shouldn't
> be any), and indeed the code runs in < 1 s on my machine (can't 
> test
> on Windows right now).




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