[yt-users] Increasing number of CPU cores can not speed up the works

Dear yt developers, I found that increasing number of CPU cores in a single node that have 16 cores and 16 additional hyper-threadings can dramatically deteriorate speed-up. figure [3] shows this result. You may reproduce figure [3] by the following steps: Running shell script [1] can automatically invoke yt script [2] and record elapsed time on files, called core_* [4]. [1] shell script: http://paste.yt-project.org/show/150/ [2] yt script: http://paste.yt-project.org/show/151/ [3] # of cores vs. elapsed time http://i.imgur.com/mFk6lKu.png [4] all scripts, data and log files: http://use.yt/upload/d8efa692 Thanks for your help. Rocky Tseng