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https://issues.apache.org/jira/browse/SINGA-156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15245177#comment-15245177
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David Patnigere commented on SINGA-156:
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Hello Sir,
Where is the macro USE_ZMQ located? in which file?
Also, how much knowledge of ZMQ do you think is required to work on this?
thank you.

> 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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