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Re: C++ FQA [message #12677 is a reply to message #12673] |
Mon, 12 November 2007 23:33 |
mdelfede
Messages: 1307 Registered: September 2007
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Ultimate Contributor |
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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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C++ FQA
By: unodgs on Tue, 06 November 2007 23:27
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Re: C++ FQA
By: unodgs on Wed, 07 November 2007 10:40
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By: unodgs on Wed, 07 November 2007 13:15
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Re: C++ FQA
By: mirek on Thu, 08 November 2007 05:34
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Re: C++ FQA
By: Zardos on Thu, 08 November 2007 13:33
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Re: C++ FQA
By: mirek on Thu, 08 November 2007 19:25
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Re: C++ FQA
By: mdelfede on Thu, 08 November 2007 23:39
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Re: C++ FQA
By: mirek on Fri, 09 November 2007 08:51
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Re: C++ FQA
By: mdelfede on Fri, 09 November 2007 13:41
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Re: C++ FQA
By: mirek on Fri, 09 November 2007 14:48
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Re: C++ FQA
By: mdelfede on Fri, 09 November 2007 15:52
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Re: C++ FQA
By: waxblood on Fri, 09 November 2007 17:07
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Re: C++ FQA
By: mdelfede on Fri, 09 November 2007 19:51
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Re: C++ FQA
By: mirek on Sat, 10 November 2007 15:14
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Re: C++ FQA
By: mdelfede on Sat, 10 November 2007 17:06
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Re: C++ FQA
By: mirek on Sat, 10 November 2007 17:54
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Re: C++ FQA
By: mdelfede on Sat, 10 November 2007 23:57
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Re: C++ FQA
By: mirek on Sun, 11 November 2007 09:54
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Re: C++ FQA
By: mdelfede on Sun, 11 November 2007 11:25
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Re: C++ FQA
By: Zardos on Tue, 13 November 2007 01:56
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Re: C++ FQA
By: mirek on Tue, 13 November 2007 09:25
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Re: C++ FQA
By: mirek on Tue, 13 November 2007 10:52
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Re: C++ FQA
By: mirek on Thu, 22 November 2007 05:43
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Re: C++ FQA
By: mdelfede on Sun, 11 November 2007 11:36
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Re: C++ FQA
By: mdelfede on Sun, 11 November 2007 18:52
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Re: C++ FQA
By: mirek on Mon, 12 November 2007 09:46
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Re: C++ FQA
By: mdelfede on Mon, 12 November 2007 10:19
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Re: C++ FQA
By: mdelfede on Mon, 12 November 2007 11:43
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Re: C++ FQA
By: mdelfede on Mon, 12 November 2007 16:47
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Re: C++ FQA
By: mirek on Mon, 12 November 2007 20:15
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Re: C++ FQA
By: mirek on Mon, 12 November 2007 20:21
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Re: C++ FQA
By: mirek on Mon, 12 November 2007 22:43
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Re: C++ FQA
By: mirek on Mon, 12 November 2007 23:34
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Re: C++ FQA
By: mdelfede on Mon, 12 November 2007 23:33
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Re: C++ FQA
By: exolon on Tue, 13 November 2007 17:30
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Re: C++ FQA
By: mdelfede on Tue, 13 November 2007 18:24
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Re: C++ FQA
By: exolon on Tue, 13 November 2007 18:58
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Re: C++ FQA
By: mirek on Fri, 16 November 2007 11:59
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Re: C++ FQA
By: waxblood on Fri, 16 November 2007 16:24
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Re: C++ FQA
By: mdelfede on Fri, 16 November 2007 16:37
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Re: C++ FQA
By: mirek on Sat, 17 November 2007 10:04
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Re: C++ FQA
By: mirek on Sat, 10 November 2007 15:22
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Re: C++ FQA
By: mdelfede on Sat, 10 November 2007 16:58
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Re: C++ FQA
By: mirek on Thu, 08 November 2007 05:25
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Re: C++ FQA
By: mirek on Wed, 07 November 2007 15:14
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Re: C++ FQA
By: mdelfede on Wed, 07 November 2007 15:39
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Re: C++ FQA
By: exolon on Mon, 12 November 2007 13:09
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Re: C++ FQA
By: mr_ped on Wed, 07 November 2007 17:05
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Re: C++ FQA
By: mr_ped on Sat, 10 November 2007 22:26
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Re: C++ FQA
By: mirek on Sat, 10 November 2007 22:35
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Re: C++ FQA
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