Arrays also have some overhead though so if your "objects" are all of equal size you could use just one array (of ints?) for all of them and create functions for indexing correctly in your array. A bit brittle but very space efficient. Of course this throws all of the benefits of Clojure or even Java out the window, it's like plain old address arithmetic in C ;)
On Mar 9, 9:17 pm, Stuart Sierra <the.stuart.sie...@gmail.com> wrote: > Java doesn't have a C-like structure type, so Java objects still have > overhead. If you want the absolute minimum number of bytes in memory, > you can create Java primitive arrays in Clojure: > > (make-array Integer/TYPE 100) > > Then access them with the "aset..." and "aget" functions. > > -Stuart Sierra > > On Mar 9, 1:04 pm, Bradbev <brad.beveri...@gmail.com> wrote: > > > I'm writing a program that will have millions of small structures in > > it. If I were writing in C (or Java I guess), I estimate the object > > size to be about 40 bytes. In Clojure, using a struct map I've made a > > rough measure & I think that the objects are weighing in at about > > 200bytes. > > > 1) I know that my measurement methods suck (cons up a big list, look > > at the total usage count & try to adjust for list overhead) - is there > > a good way that I can measure the size in memory of my structmap? > > 2) Is there a good way to optimize the size of these objects in > > Clojure? I'd prefer to stay within Clojure, but my current plan to > > squeeze the smallest size out is to move to a Java object. > > > I also know the types of the struct members, and most of them are > > 32bit numbers. Eliminating dynamic types from the struct is probably > > important for overall size. > > > Any thoughts? > > > Cheers, > > Brad --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
