English version
Accueil     À propos     Téléchargement     Ressources     Contactez-nous    

Ce site est rarement mis à jour. Pour les informations les plus récentes, rendez-vous sur le nouveau site OCaml à l'adresse ocaml.org.

Browse thread
caml_oldify_local_roots takes 50% of the total runtime
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: 2006-12-15 (10:56)
From: Hendrik Tews <H.Tews@c...>
Subject: Re: [Caml-list] caml_oldify_local_roots takes 50% of the total runtime

issue 4145 (http://caml.inria.fr/mantis/view.php?id=4145) has
been closed in the meantime because

    doligez - 2006-11-15 13:19  
   Unfortunately, we cannot know which global C roots point to the minor heap,
   since we don't have a write barrier on C variables.

I find this reason not satisfying at all. If a write barrier is
needed, then one could easily stipulate one by providing a
suitable macro CAML_modify_global_root.

With the above line of reasoning it should not be allowed to hold
any ocaml value in a C variable, because a write barrier is
needed for objects that are not in the young generation.