From: Alex Baretta <alex@baretta.com>
To: skaller@users.sourceforge.net
Cc: Alex Baretta <alex@barettadeit.com>, Ocaml <caml-list@inria.fr>
Subject: Re: [Caml-list] Ocaml automation update
Date: Sun, 19 Sep 2004 20:19:05 +0200 [thread overview]
Message-ID: <414DCD99.10307@baretta.com> (raw)
In-Reply-To: <1094314643.3352.342.camel@pelican.wigram>
skaller wrote:
> On Sun, 2004-09-05 at 01:36, Alex Baretta wrote:
>
>>I wish to let you know that the first application of ocaml to realtime
>>industrial control has succeeded.
>
>
> Nice job! Now we all want to know -- how did the
> Ocaml GC stand up? How did you tweak it? :)
>
Sorry for not answering earlier. GC simpòy is not an issue. We allocate
a lot, but newly allocated blocks tend to have a very short life. The GC
is kept latent during PLC rounds and activated between rounds with
heap compaction disabled. The full_major collection is an order of
magnitude faster than the cycle time we require, and since we run it
sistematically between rounds it runs in constant and predictable time.
The only unpredictable latencies are due to heap compaction, but we only
run heap compaction when the system is known to be in quiescent state
until user input.
Alex
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next prev parent reply other threads:[~2004-09-19 18:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-04 15:36 Alex Baretta
2004-09-04 16:17 ` skaller
2004-09-19 18:19 ` Alex Baretta [this message]
2004-09-19 21:26 ` I R T
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