Hi, I have two refs a1, a2. One thread modifies a1, another modifies a2.
Sample code: http://gist.github.com/556679 If I don't ensure any ref in the transaction, the code runs in ~ 0.2 ms. $ java -cp lib/clojure-1.2.0.jar\;src clojure.main -e "(require 'tt) (tt/transaction-simul {:ensure2 false :ensure1 false}) (System/exit 0)" Amounts=[-100,-100] "Elapsed time: 0.248209 msecs" If I ensure the non-modifying ref - the code takes variable amount of time - ranging from 1 second to 15 seconds (10 runs). $ java -cp lib/clojure-1.2.0.jar\;src clojure.main -e "(require 'tt) (tt/transaction-simul {:ensure2 true :ensure1 false}) (System/exit 0)" Amounts=[100,-100] "Elapsed time: 7545.406736 msecs" If I ensure both refs - the code takes even more time (on average). $ java -cp lib/clojure-1.2.0.jar\;src clojure.main -e "(require 'tt) (tt/transaction-simul {:ensure2 true :ensure1 true}) (System/exit 0)" Amounts=[-100,100] "Elapsed time: 10705.949317 msecs" Can someone explain to me what ensure exactly does (implementation wise)? and why its taking so much time? Thanks! PS: If someone is interested in the context - my first blog entry: http://ka133.blogspot.com/2010/08/serializable-concurrency-sql-clojure.html -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
