BTL TCP async progress #1491
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BTL TCP async progress #1491
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bosilca
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To answer the @jsquyres questions from #1406. The answer is: this patch doesn't modify the default behavior of the TCP BTL, except that it make it thread safe. However, in addition to this, the code add a second execution path that provides support for async progress for the TCP BTL. However, this support has to be enabled via an MCA parameter in order to be activated. |
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All BTL-only operations (basically all data movements with the exception of the matching operation) can now be handled for the TCP BTL by a progress thread.
Added mca parameter to turn progress thread on/off Add a flag to check if we have btl progress thread. Added macro for ob1 matching lock. Update the AUTHORS file.
Per @jsquyres suggestion remove all trailing spaces. Credit to `sed -i.bak 's/ *$//' */[ch]`.
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Do we need btl_tcp_progress_thread asyc progress for correctness or just for progress / throughput? |
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This is only needed for async progress. This construct is protected behind am MCA parameter, so in order to get async progress one must explicitly ask for it. |
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This patch fixed known issues with multi-threading support in the TCP BTL and add support for async progress to the same BTL (even when the multi-threading is not enabled). By default the async progress is compiled in (assuming thread support has been discovered during configure) but is disabled. Use the MCA parameter btl_tcp_progress_thread to activate this extra thread and gain async progress.