ObjectSpace.count_objects

(?::Hash[::Symbol, ::Integer] result_hash) -> ::Hash[::Symbol, ::Integer]

ObjectSpace.count_objects([result_hash]) → hash

static VALUE
count_objects(int argc, VALUE *argv, VALUE os)
{
    struct count_objects_data data = { 0 };
    VALUE hash = Qnil;

    if (rb_check_arity(argc, 0, 1) == 1) {
        hash = argv[0];
        if (!RB_TYPE_P(hash, T_HASH))
            rb_raise(rb_eTypeError, "non-hash given");
    }

    rb_gc_impl_each_object(rb_gc_get_objspace(), count_objects_i, &data);

    if (NIL_P(hash)) {
        hash = rb_hash_new();
    }
    else if (!RHASH_EMPTY_P(hash)) {
        rb_hash_stlike_foreach(hash, set_zero, hash);
    }
    rb_hash_aset(hash, ID2SYM(rb_intern("TOTAL")), SIZET2NUM(data.total));
    rb_hash_aset(hash, ID2SYM(rb_intern("FREE")), SIZET2NUM(data.freed));

    for (size_t i = 0; i <= T_MASK; i++) {
        VALUE type = type_sym(i);
        if (data.counts[i])
            rb_hash_aset(hash, type, SIZET2NUM(data.counts[i]));
    }

    return hash;
}

Counts all objects grouped by type.

It returns a hash, such as:

Example

{
  :TOTAL=>10000,
  :FREE=>3011,
  :T_OBJECT=>6,
  :T_CLASS=>404,
  # ...
}

The contents of the returned hash are implementation specific. It may be changed in future.

The keys starting with :T_ means live objects. For example, :T_ARRAY is the number of arrays. :FREE means object slots which is not used now. :TOTAL means sum of above.

If the optional argument result_hash is given, it is overwritten and returned. This is intended to avoid probe effect.

Example

h = {}
ObjectSpace.count_objects(h)
puts h
# => { :TOTAL=>10000, :T_CLASS=>158280, :T_MODULE=>20672, :T_STRING=>527249 }

This method is only expected to work on C Ruby.

See also .count_nodes .count_objects_size .count_imemo_objects .count_symbols also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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