package coq-core

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This program is a small time and allocation profiler for Objective Caml

Adapted from Christophe Raffalli

To use it, link it with the program you want to profile.

To trace a function "f" you first need to get a key for it by using :

let fkey = declare_profile "f";;

(the string is used to print the profile information). Warning: this function does a side effect. Choose the ident you want instead "fkey".

Then if the function has ONE argument add the following just after the definition of "f" or just after the declare_profile if this one follows the definition of f.

let f = profile1 fkey f;;

If f has two arguments do the same with profile2, idem with 3, ... For more arguments than provided in this module, make a new copy of function profile and adapt for the needed arity.

If you want to profile two mutually recursive functions, you had better to rename them :

let fkey = declare_profile "f";; let gkey = declare_profile "g";; let f' = .... f' ... g' and g' = .... f' .... g' ;;

let f = profile fkey f';; let g = profile gkey g';;

Before the program quits, you should call "print_profile ();;". It produces a result of the following kind:

Function name Own time Total time Own alloc Tot. alloc Calls f 0.28 0.47 116 116 5 4 h 0.19 0.19 0 0 4 0 g 0.00 0.00 0 0 0 0 others 0.00 0.47 392 508 9 Est. overhead/total 0.00 0.47 2752 3260

  • The first column is the name of the function.
  • The third column give the time (utime + stime) spent inside the function.
  • The second column give the time spend inside the function minus the time spend in other profiled functions called by it
  • The 4th and 5th columns give the same for allocated words
  • The 6th and 7th columns give the number of calls to the function and the number of calls to profiled functions inside the scope of the current function

Remarks:

  • If a function has a polymorphic type, you need to supply it with at least one argument as in "let f a = profile1 fkey f a;;" (instead of "let f = profile1 fkey f;;") in order to get generalization of the type.
  • Each line of the form "let f a = profile1 fkey f a;;" in your code counts for 5 words and each line of the form "let f = profile1 fkey f;;" counts for 6 words (a word is 4 or 8 bytes according to the architecture); this is counted for "others".
  • Time fields for functions doing a little job is usually non pertinent.

i

type profile_key
val set_recording : string -> unit
val print_profile : unit -> unit
val reset_profile : unit -> unit
val init_profile : unit -> unit
val declare_profile : string -> profile_key
val profile1 : profile_key -> ('a -> 'b) -> 'a -> 'b
val profile2 : profile_key -> ('a -> 'b -> 'c) -> 'a -> 'b -> 'c
val profile3 : profile_key -> ('a -> 'b -> 'c -> 'd) -> 'a -> 'b -> 'c -> 'd
val profile4 : profile_key -> ('a -> 'b -> 'c -> 'd -> 'e) -> 'a -> 'b -> 'c -> 'd -> 'e
val profile5 : profile_key -> ('a -> 'b -> 'c -> 'd -> 'e -> 'f) -> 'a -> 'b -> 'c -> 'd -> 'e -> 'f
val profile6 : profile_key -> ('a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g) -> 'a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g
val profile7 : profile_key -> ('a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g -> 'h) -> 'a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g -> 'h
val profile8 : profile_key -> ('a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g -> 'h -> 'i) -> 'a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g -> 'h -> 'i

Some utilities to compute the logical and physical sizes and depth of ML objects

val print_logical_stats : 'a -> unit

Print logical size (in words) and depth of its argument This function does not disturb the heap

val print_stats : 'a -> unit

Print physical size, logical size (in words) and depth of its argument This function allocates itself a lot (the same order of magnitude as the physical size of its argument)

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