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From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: Tom Ridge <tom.j.ridge+list@googlemail.com>
Cc: OCaml Mailing List <caml-list@inria.fr>
Subject: Re: [Caml-list] Question about garbage collection and impact on performance
Date: Thu, 5 Dec 2013 10:09:00 +0900	[thread overview]
Message-ID: <1711883A-1A24-45E1-A105-453BAAEEE119@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <CABooLwP7eSJ5Zc=3uSwCqU4a8Yy6a8bSm_74fQEhN=ceEzpdVw@mail.gmail.com>

2013/12/04 21:20, Tom Ridge <tom.j.ridge+list@googlemail.com>:

> Dear caml-list,
> 
> I have an OCaml program which I expect to run in time O((n^3) *
> (ln(n))) say. My expectations are based (unrealistically) on ignoring
> garbage collection completely. As inputs get large, the program
> performs worse than I expect.
> 
> My question is: is it possible for OCaml's garbage collection to alter
> the time complexity of my program?

I would say that, on a program that is already O(n^3), that would be very surprising.
What kind of measure did you do?
If your program uses lots of memory, swapping may be a major slowdown,
using a GC or not (but a badly tuned GC may cause more swapping).

Jacques Garrigue

  parent reply	other threads:[~2013-12-05  1:09 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-04 12:20 Tom Ridge
2013-12-04 12:43 ` Malcolm Matalka
2013-12-04 13:48 ` Gabriel Scherer
2013-12-19 22:47   ` Richard W.M. Jones
2013-12-22  2:25     ` Jon Harrop
2013-12-22  3:04       ` David Sheets
2013-12-22 12:43         ` Jeff Schultz
2013-12-22 10:41       ` Richard W.M. Jones
2013-12-04 18:09 ` Jon Harrop
2013-12-05  1:09 ` Jacques Garrigue [this message]
2013-12-05 10:08   ` Tom Ridge
2013-12-05 10:37     ` Malcolm Matalka
2013-12-05 10:48     ` Michael Hicks
2013-12-05 11:21       ` Tom Ridge
2013-12-05 21:09       ` Jon Harrop

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