* On registering values for use in C
@ 2007-02-19 18:37 Nathaniel Gray
2007-02-19 22:29 ` [Caml-list] " Robert Roessler
0 siblings, 1 reply; 2+ messages in thread
From: Nathaniel Gray @ 2007-02-19 18:37 UTC (permalink / raw)
To: OCaml
I have a question about registering values for use in C. I've read
that registering lots of values can have a bad effect on GC
performance, but what about registering "large" values? For example,
is registering a record with 20 fields just as bad as registering 10
records with 2 fields each?
Thanks,
-n8
--
>>>-- Nathaniel Gray -- Caltech Computer Science ------>
>>>-- Mojave Project -- http://mojave.cs.caltech.edu -->
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Caml-list] On registering values for use in C
2007-02-19 18:37 On registering values for use in C Nathaniel Gray
@ 2007-02-19 22:29 ` Robert Roessler
0 siblings, 0 replies; 2+ messages in thread
From: Robert Roessler @ 2007-02-19 22:29 UTC (permalink / raw)
To: Caml-list
Nathaniel Gray wrote:
> I have a question about registering values for use in C. I've read
> that registering lots of values can have a bad effect on GC
> performance, but what about registering "large" values? For example,
> is registering a record with 20 fields just as bad as registering 10
> records with 2 fields each?
Having implemented "generational" GCs, I can make a generic comment on
this (without consulting the OCaml sources): as each one of the items
you register represents a "root" (for our purposes, a tree of items
which *may* or *may not* not be pointed to by any other item), there
is a certain amount of per-root overhead that gets amortized over the
items "marked" (or copied or whatever) during a GC. This being the
case, it is likely that your case of "a record with 20 fields" will be
"less bad" than your case of "10 records with 2 fields each".
Robert Roessler
roessler@rftp.com
http://www.rftp.com
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