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Re: C++ FQA [message #12677 is a reply to message #12673]

Mon, 12 November 2007 23:33

mdelfede is currently offline

mdelfede
Messages: 1307
Registered: September 2007

Ultimate Contributor

Well, also being absolutely not an expert of GC algorithms, I always think that to allocate a lot of memory just because there is enough of it it's not a great practice.
First thing, you must look to what does OS in respect of free memory.... If your OS tells you that you've got 1 GB free ram, even when it's already swapping out another GB on disk, what this behaviour does is slowing down your system.

IMHO a truly efficient GC should be hardware implemented, or at least have a strong hardware support. Doing it software you'll face everytimes with some sort of problem, as latency, memory inefficiency or both.
And it should also collect freed memory asap.
Cbpporter spoke about some sort of 'threshold' for collecting garbage.... but what should be such a threshold ? On oldest OS that was simple, no swapping mechanics, so you could decide, 30% of physical ram, ok. On modern OS, you can't. That depends on too many factors, on how many processes are running, and so on. You could implement a maybe efficient GC only at OS level, not at the application level, I guess.

No doubt that manual memory allocation is more efficient than GC, even if it can be a bot slower on the short time.
And a good framework can help to keep things simple.

Id rather extend C++ (or make some more modern language, without GC) to include some helpful features, than switch to less efficient languages.

Ciao

Max

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[Message index]

		C++ FQA By: unodgs on Tue, 06 November 2007 23:27
		Re: C++ FQA By: Mindtraveller on Wed, 07 November 2007 00:41
		Re: C++ FQA By: unodgs on Wed, 07 November 2007 10:40
		Re: C++ FQA By: cbpporter on Wed, 07 November 2007 11:33
		Re: C++ FQA By: unodgs on Wed, 07 November 2007 13:15
		Re: C++ FQA By: Mindtraveller on Wed, 07 November 2007 14:03
		Re: C++ FQA By: cbpporter on Wed, 07 November 2007 14:57
		Re: C++ FQA By: Mindtraveller on Wed, 07 November 2007 18:02
		Re: C++ FQA By: cbpporter on Wed, 07 November 2007 19:30
		Re: C++ FQA By: Mindtraveller on Thu, 08 November 2007 00:13
		Re: C++ FQA By: mirek on Thu, 08 November 2007 05:34
		Re: C++ FQA By: Zardos on Thu, 08 November 2007 13:33
		Re: C++ FQA By: mirek on Thu, 08 November 2007 19:25
		Re: C++ FQA By: mdelfede on Thu, 08 November 2007 23:39
		Re: C++ FQA By: mirek on Fri, 09 November 2007 08:51
		Re: C++ FQA By: mdelfede on Fri, 09 November 2007 13:41
		Re: C++ FQA By: mirek on Fri, 09 November 2007 14:48
		Re: C++ FQA By: mdelfede on Fri, 09 November 2007 15:52
		Re: C++ FQA By: waxblood on Fri, 09 November 2007 17:07
		Re: C++ FQA By: mdelfede on Fri, 09 November 2007 19:51
		Re: C++ FQA By: mirek on Sat, 10 November 2007 15:14
		Re: C++ FQA By: mdelfede on Sat, 10 November 2007 17:06
		Re: C++ FQA By: cbpporter on Sat, 10 November 2007 17:31
		Re: C++ FQA By: mirek on Sat, 10 November 2007 17:54
		Re: C++ FQA By: mdelfede on Sat, 10 November 2007 23:57
		Re: C++ FQA By: mirek on Sun, 11 November 2007 09:54
		Re: C++ FQA By: mdelfede on Sun, 11 November 2007 11:25
		Re: C++ FQA By: Zardos on Tue, 13 November 2007 01:56
		Re: C++ FQA By: mirek on Tue, 13 November 2007 09:25
		Re: C++ FQA By: cbpporter on Tue, 13 November 2007 10:14
		Re: C++ FQA By: mirek on Tue, 13 November 2007 10:52
		Re: C++ FQA By: mirek on Thu, 22 November 2007 05:43
		Re: C++ FQA By: mdelfede on Sun, 11 November 2007 11:36
		Re: C++ FQA By: Mindtraveller on Sun, 11 November 2007 18:22
		Re: C++ FQA By: mdelfede on Sun, 11 November 2007 18:52
		Re: C++ FQA By: Mindtraveller on Mon, 12 November 2007 00:58
		Re: C++ FQA By: mirek on Mon, 12 November 2007 09:46
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 10:19
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 10:28
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 11:43
		Re: C++ FQA By: Mindtraveller on Mon, 12 November 2007 15:54
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 16:47
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 16:51
		Re: C++ FQA By: mirek on Mon, 12 November 2007 20:15
		Re: C++ FQA By: mirek on Mon, 12 November 2007 20:21
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 21:39
		Re: C++ FQA By: mirek on Mon, 12 November 2007 22:43
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 23:22
		Re: C++ FQA By: mirek on Mon, 12 November 2007 23:34
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 23:33
		Re: C++ FQA By: exolon on Tue, 13 November 2007 17:30
		Re: C++ FQA By: mdelfede on Tue, 13 November 2007 18:24
		Re: C++ FQA By: exolon on Tue, 13 November 2007 18:58
		Re: C++ FQA By: Mindtraveller on Fri, 16 November 2007 00:43
		Re: C++ FQA By: mirek on Fri, 16 November 2007 11:59
		Re: C++ FQA By: waxblood on Fri, 16 November 2007 16:24
		Re: C++ FQA By: mdelfede on Fri, 16 November 2007 16:37
		Re: C++ FQA By: mirek on Sat, 17 November 2007 10:04
		Re: C++ FQA By: mirek on Sat, 10 November 2007 15:22
		Re: C++ FQA By: mdelfede on Sat, 10 November 2007 16:58
		Re: C++ FQA By: mirek on Thu, 08 November 2007 05:25
		Re: C++ FQA By: mirek on Wed, 07 November 2007 15:14
		Re: C++ FQA By: mdelfede on Wed, 07 November 2007 15:39
		Re: C++ FQA By: exolon on Mon, 12 November 2007 13:09
		Re: C++ FQA By: mr_ped on Wed, 07 November 2007 17:05
		Re: C++ FQA By: tvanriper on Fri, 09 November 2007 12:56
		Re: C++ FQA By: mr_ped on Sat, 10 November 2007 22:26
		Re: C++ FQA By: mirek on Sat, 10 November 2007 22:35
		Re: C++ FQA By: Mindtraveller on Tue, 13 November 2007 02:41
		Re: C++ FQA By: Mindtraveller on Thu, 27 December 2007 14:47

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