Haha, excellent. I studied cargo cults a bit in anthropology classes, long ago, and never suspected how relevant they would be.
You would probably enjoy this: http://www.fanfiction.net/s/5782108/1/Harry_Potter_and_the_Methods_of_Rationality Until Google makes a change, maybe the other frameworks should try the same trick? On Thu, Jun 9, 2011 at 8:31 AM, Jeff Schnitzer <j...@infohazard.org> wrote: > On Thu, Jun 9, 2011 at 1:32 AM, Gal Dolber <gal.dol...@gmail.com> wrote: > > I am not comparing reflexion vs byte-code generation or anything like > that, > > apt generates code, is not a runtime technology. > > Like or not reflexion is known to be slower than actually writing the > code. > > This is entirely irrelevant. We've now established that the issue at > hand is a strange quirk in the Low-Level API and has nothing to do > with reflection. 100% (or close to it) of the performance "gain" of > Slim3 is because it calls .size() on a List before iterating it. > > > Slim3 generates the minimal possible code you need to talk with the low > > level api, if the low level bench is faster is just because its not > > converting the Entity to the Pojo. > > You missed the point - in the benchmark, Slim3 was *faster* than the > Low-Level API. This clearly indicated something was amiss, and now > we've uncovered the actual cause. It turns out to be something quite > interesting indeed. > > This is a classic case of what Feynman called Cargo Cult Science. You > all believed that Slim3 should be faster than other APIs because code > generation is faster than reflection, so when someone produced an > ill-conceived benchmark that seemed to confirm your preconceived > notion, you just accepted the entire narrative: "Slim3 is fast > because it doesn't use reflection!" This is sloppy thinking (see: > Confirmation Bias). > > If you haven't read this, it's a gem (I make a habit of re-reading it > at least once a year): > > http://www.lhup.edu/~DSIMANEK/cargocul.htm > > Jeff > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-java@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
