[reduce]

Am I reading this correctly? Looking at the benchmark code, Why not do a comparison versus the default Tornado setup, which is to fork one process per core? So STM Tornado is allowed to use multiple cores in this benchmark, but vanilla Tornado is not allowed to?

        http_server = HTTPServer(Application(),
                                 xheaders=True,
                                 )
        http_server.bind(port)
        http_server.start(0) # Forks one sub-process per core

[1] https://bitbucket.org/kostialopuhin/tornado-stm-bench/src/65...

[fijal]

The problem with multiple processes is the "share nothing" model. It works for some problems, but it blatantly fails for a whole variety of other problems. STM tries to address those problems where "share nothing" does not work, e.g. because there is interesting data to be shared (albeit with few conflicts) or the memory overhead of N processes is just too much.