0684002812
fix some of the multi-threading problems for the cid allocation. Two bugs specifically: - since we do not have a queue for incoming fragments of unknown cid, we need to synchronize all processes before exiting the communicator creation. This synchronization was/is located in comm_activate, which was however too late for the multi-threaded case. Thus, for multi-threaded scenarios we are now synchronizing 'before' we allow another thread to enter the cid-allocation loop. - for synchronization, we used for the sake of simplicity allreduce operations. It turns out, that these operations interefered with the allreductions in the cid-allocation routine, which lead to non-sense results in the cid-allocation and potentially to endless loops. Multi-threaded communicator creation seems to work now, is however still 'very very' slow. I think, the busy wait of threads is killing the performance of the active threads in the cid allocation. But this is another topic. This commit was SVN r15910. |
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| .. | ||
| comm_cid.c | ||
| comm_dyn.c | ||
| comm_init.c | ||
| comm_publish.c | ||
| comm.c | ||
| communicator.h | ||
| Makefile.am | ||