Re: funcall consing

[LdBeth]

>>>>> In <8335m8hazn.fsf@gnu.org> 
>>>>>   Eli Zaretskii <eliz@gnu.org> wrote:

ldb> The `80' indicats the GC has been invoked 80 times. That is the direct
ldb> indication of "consing".

Eli> Why are you saying that the number of times GC has been invoked is the
Eli> direct indication of consing?  I don't think it is.  Emacs doesn't
Eli> call GC because it knows how much consing was done, it calls GC in
Eli> certain strategic points in the interpreter, when the Lisp program
Eli> happens to hit those points.  And funcall is indeed one of those
Eli> points.

The docstring of `gc-cons-threshold' says:

| Number of bytes of consing between garbage collections.
| Garbage collection can happen automatically once this many bytes have been
| allocated since the last garbage collection.  All data types count.
|
| Garbage collection happens automatically only when ‘eval’ is called.

``GC checkpoints'' are not equivlent to the actually invocation of GC
that would increase `gcs-done' (that is the variable been used by
`benchmark-run' to calculate the gc numbers). Otherwise, either this
docstring is untrue or the snippet below would always print different
numbers.

```
(progn
  (print gcs-done)
  (eval '(cons 1 2))
  (print gcs-done))
```

-- 
LDB