From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: Please Help.
Date: 1997/09/18
Date: 1997-09-18T00:00:00+00:00 [thread overview]
Message-ID: <dewar.874604078@merv> (raw)
In-Reply-To: 342005BE.5C4E@gsfc.nasa.gov
<<The downside is heap fragmentation, which will bite you just when it
costs the most to fix. Controlled types can guarantee no dangling
pointers; they do not guarantee no heap fragmentation. For that you need
compacting storage pools (or very careful use of Unbounded_Strings).
Is there a requirement in Ada 95 to document whether the
Unbounded_Strings implementation is compacting? This would be useful
information; I haven't seen it in Annex M for ObjectAda, but I don't
believe I've read the whole thing.>>
Well these days on typical machines, fragmentation just translates into
poorer performance because of more paging. But compacting may or may not
help to reduce paging. It is not a clear call at all
There is no requirement for documenting this, since there is no imagination
of compacting being an issue. (there is also no requirement to document
whether your storage allocator reads the CMOS clock, or takes locks, or
makes direct BIOS calls, or allocates more than it needs to, or anything
else!)
next prev parent reply other threads:[~1997-09-18 0:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-09-09 0:00 Please Help Ken
1997-09-09 0:00 ` Dale Stanbrough
1997-09-11 0:00 ` Robert Dewar
1997-09-12 0:00 ` Tristan Ludowyk
1997-09-12 0:00 ` Robert Dewar
1997-09-13 0:00 ` Matthew Heaney
1997-09-13 0:00 ` Dale Stanbrough
1997-09-12 0:00 ` Dale Stanbrough
1997-09-12 0:00 ` Stephen Leake
1997-09-13 0:00 ` Robert Dewar
1997-09-15 0:00 ` Stephen Leake
1997-09-15 0:00 ` Dale Stanbrough
1997-09-16 0:00 ` Robert Dewar
1997-09-17 0:00 ` Stephen Leake
1997-09-18 0:00 ` Robert Dewar [this message]
1997-09-19 0:00 ` Stephen Leake
1997-09-19 0:00 ` Robert S. White
1997-09-20 0:00 ` Robert Dewar
1997-09-15 0:00 ` Richard A. O'Keefe
1997-09-16 0:00 ` Robert Dewar
1997-09-09 0:00 ` Stephen Leake
-- strict thread matches above, loose matches on Subject: below --
2001-10-25 6:55 please help Phosphorus
2001-10-25 8:22 ` Preben Randhol
2001-10-25 12:35 ` Marc A. Criley
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