]> On Wednesday, November 19, 2003, at 06:52 PM, Daniel Bünzli wrote: > Since my first attempt [1] didn't really get through, I try to > reformulate my post. Sorry I didn't answer earlier, the traffic on caml-list is getting quite heavy these days. > 1) What is the accuracy of these results ? > > E.g. I read in the documentation of the Gc module that the field > minor_words is only an approximation in programs compiled to native > code. Because of the way we trigger a minor collection in native code, the counters will overestimate the number of words allocated by a few words per minor GC. Note that it is always an overestimation, and the error is at most 256 words per collection. > Is it also true for the other fields ? No. The other fields are accurate. > Would the figure minor+major-promoted be accurate ? No. The error in minor will propagate. > How much can I trust the figures I get ? You can repeat your experiment after changing the size of the minor heap, that will give you a good idea of the error. The bigger the heap, the smaller the error, and it converges to error=0 for an infinite heap. > 2) When I start profiling should I prefer a Gc.compact to a > Gc.full_major ? If you're only interested in minor+major-promoted, you don't even need a Gc.full_major. A Gc.compact would be if you are timing a very allocation-intensive program, and even then I doubt it will make much difference. > 3) Is it possible to know at runtime whether we are running native > code or interpreted bytecode ? Good question. I don't know the answer. Maybe you should file this as a feature wish in the bug tracking system: < http://caml.inria.fr/bin/caml-bugs >. > Regarding time profiling, a binding in the Unix module to the > getrusage() function would definitvely be nice. Another candidate for the bug tracking system. -- Damien ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners