Original bug ID: 1065
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: minor
Category: ~DO NOT USE (was: OCaml general)

Bug description

Full_Name: Martin Jambon
Version: 3.04
OS: PC/Linux
Submission from: pc-bioinfo1.ibcp.fr (193.51.160.63)

Sizes in Gc.stat seems to be expressed in bytes rather than in words.

Here is the creation of 10 arrays containing 1000000 zeros.
Its size should be approximately 10 * 1000000 = 10 M words or 40 Mbytes on a
32-bit architecture.
But heap_words = 40525824
(and `top' says that the memory usage of the process is 40Mbytes).

[pc-bioinfo1] ~ % ocaml
Objective Caml version 3.04

let a = Array.make_matrix 10 1000000 0;;

val a : int array array =
[|[|0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0;
0; 0; 0; 0; 0; 0; 0; 0; 0; 0; ...|];
...|]

Gc.print_stat stdout;;

minor_words: 172342
promoted_words: 34080
major_words: 10086991
minor_collections: 4
major_collections: 16
heap_words: 40525824
heap_chunks: 12
live_words: 10082352
live_blocks: 15699
free_words: 49037
free_blocks: 15
largest_free: 44435
fragments: 67
compactions: 0

• : unit = ()