[OMP] Threadprivate common dramatically decrease performance

jimdempseyatthecove
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July 6, 2009 9:50 AM PDT
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#4 Reply to #2
Quoting - tim18
You would expect to pay the cost of copying data in and out of threadprivate at the beginning and end of each parallel region, which could be substantially more than the bare allocation cost.  I don't know how the out-dated compiler would affect this, except that it doesn't include the current version of OpenMP library.

Tim,

The shared (local) data (scalars or descriptor) would be copied (as hidden dummy arguments) but the threadprivate data persists (no copying required).

Jim

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