According to the moses_steps page, the -j X option sets the "number of simultaneous tasks is a speedier option for machines with multiple processors."
Moses decoder also supports an option -threads x to set the number of parallel threads during decoding (assuming the language model supports multi-threading). I saw somewhere that setting the -j option to more than the number of cores can be beneficial with a large number of cores. I'm building a training/decoding machine with 12 cores (two sockets with 6 cores each) and 48 GB RAM. Is there any advantage to compiling moses with -j 13 or 14? Is there a maximum? What is the relationship between the -j compile option and the -threads runtime option? Thanks, Tom
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