wangwei created SINGA-156:
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             Summary: Remove the dependency on ZMQ for single process training
                 Key: SINGA-156
                 URL: https://issues.apache.org/jira/browse/SINGA-156
             Project: Singa
          Issue Type: Improvement
            Reporter: wangwei


SINGA depends on ZMQ and CZMQ, which are used for both intra and inter process 
communication.
In fact, for training using a single process (multiple threads), we can avoid 
ZMQ and CZMQ for the intra-process communication. Hence, we can compile SINGA 
without ZMQ and CZMQ for single process training.
This ticket implements the intra-process communication by assigning a 
thread-safe queue for each socket (i.e., dealer and router). The sender pushes 
the msg onto the receiver's queue. 
There is a macro 'USE_ZMQ', which controls the compiling of ZMQ related code. 
If USE_ZMQ is not defined, SINGA can only run for single process. Otherwise, 
SINGA uses ZMQ for inter-process communication for training over multiple 
processes.



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