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| Re: Core 2019 [message #51925 is a reply to message #51924] |
Fri, 21 June 2019 09:16   |
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mirek
Messages: 13975
Registered: November 2005
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Ultimate Member |
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I think you cannot deduce too much about efficiency looking at "down" number. That will depend a lot on overall load of system, more the load, less this number as system will page out unused pages from your apps address space. So the current philosophy of U++ allocator is that this does not matter.
Further explanation. The function that any allocator is using to obtain address space from system is mmap and there is munmap that returns address space to system. Normally there is a threshold - if block is too big, it allocation is simply handled by mmap / munmap calls, meaning it is returned to the system at MemoryFree. If it is less than threshold, bigger chung is mmaped from the system and then divided to smaller chunks (somehow).
Now what is different is that standard GCC allocator has thershold at 4MB. U++ allocatar at 224MB. In practive, this means that if you alloc / free 5MB block in std, it gets released back to system immediately. With U++, blocks up to 224 MB are not returned to the system immediately. If they are really unused, this just means that system will retrieve them when there is a need for more physical memory.
Mirek
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Core 2019
By: mirek on Fri, 07 June 2019 13:56 |
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Re: Core 2019
By: Novo on Fri, 07 June 2019 17:51 |
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Re: Core 2019
By: mirek on Fri, 07 June 2019 18:01 |
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Re: Core 2019
By: Novo on Fri, 07 June 2019 23:00 |
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Re: Core 2019
By: Novo on Sat, 08 June 2019 18:30 |
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Re: Core 2019
By: mirek on Sat, 08 June 2019 18:40 |
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Re: Core 2019
By: Novo on Sat, 08 June 2019 19:44 |
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Re: Core 2019
By: mirek on Sat, 08 June 2019 20:38 |
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Re: Core 2019
By: Novo on Sat, 08 June 2019 21:45 |
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Re: Core 2019
By: Novo on Sat, 08 June 2019 21:42 |
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Re: Core 2019
By: mirek on Sat, 08 June 2019 18:31 |
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Re: Core 2019
By: Novo on Sat, 08 June 2019 21:54 |
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Re: Core 2019
By: Novo on Sat, 08 June 2019 22:06 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 10:03 |
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Re: Core 2019
By: Novo on Sun, 09 June 2019 15:20 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 16:33 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 16:43 |
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Re: Core 2019
By: Novo on Sun, 09 June 2019 17:34 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 18:54 |
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Re: Core 2019
By: Novo on Sun, 09 June 2019 21:39 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 23:11 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 23:25 |
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Re: Core 2019
By: mirek on Mon, 10 June 2019 17:27 |
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Re: Core 2019
By: Novo on Mon, 10 June 2019 18:01 |
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Re: Core 2019
By: mirek on Mon, 10 June 2019 18:17 |
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Re: Core 2019
By: Novo on Mon, 10 June 2019 18:21 |
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Re: Core 2019
By: Novo on Mon, 10 June 2019 18:45 |
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Re: Core 2019
By: Novo on Mon, 10 June 2019 18:18 |
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Re: Core 2019
By: Novo on Mon, 10 June 2019 18:34 |
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Re: Core 2019
By: Novo on Sun, 09 June 2019 17:02 |
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Re: Core 2019
By: Novo on Sun, 09 June 2019 17:15 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 20:56 |
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Re: Core 2019
By: mirek on Sun, 09 June 2019 18:51 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 05:43 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 06:14 |
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Re: Core 2019
By: mirek on Fri, 21 June 2019 09:16 |
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Re: Core 2019
By: mirek on Fri, 21 June 2019 09:23 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 19:58 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 20:28 |
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Re: Core 2019
By: Novo on Sat, 22 June 2019 02:51 |
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Re: Core 2019
By: Novo on Sat, 22 June 2019 02:53 |
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Re: Core 2019
By: mirek on Sat, 22 June 2019 10:23 |
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Re: Core 2019
By: Novo on Sat, 22 June 2019 17:49 |
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Re: Core 2019
By: mirek on Sat, 22 June 2019 22:22 |
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Re: Core 2019
By: Novo on Sat, 22 June 2019 23:44 |
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Re: Core 2019
By: mirek on Sun, 23 June 2019 08:21 |
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Re: Core 2019
By: Novo on Sun, 23 June 2019 21:26 |
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Re: Core 2019
By: mirek on Mon, 24 June 2019 09:22 |
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Re: Core 2019
By: Novo on Mon, 24 June 2019 17:36 |
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Re: Core 2019
By: mirek on Mon, 24 June 2019 18:42 |
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Re: Core 2019
By: Novo on Mon, 24 June 2019 19:36 |
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Re: Core 2019
By: mirek on Mon, 24 June 2019 20:15 |
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Re: Core 2019
By: mirek on Sun, 23 June 2019 09:55 |
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Re: Core 2019
By: mirek on Sun, 23 June 2019 10:19 |
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Re: Core 2019
By: Novo on Mon, 24 June 2019 06:13 |
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Re: Core 2019
By: mirek on Wed, 26 June 2019 08:52 |
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Re: Core 2019
By: mirek on Thu, 27 June 2019 09:44 |
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Re: Core 2019
By: mirek on Fri, 28 June 2019 09:09 |
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Re: Core 2019
By: Tom1 on Fri, 28 June 2019 16:56 |
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Re: Core 2019
By: mirek on Fri, 28 June 2019 17:30 |
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Re: Core 2019
By: mirek on Fri, 28 June 2019 17:31 |
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Re: Core 2019
By: mirek on Fri, 28 June 2019 17:40 |
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Re: Core 2019
By: Tom1 on Fri, 28 June 2019 18:38 |
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Re: Core 2019
By: Novo on Sun, 30 June 2019 19:02 |
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Re: Core 2019
By: mirek on Sun, 30 June 2019 19:11 |
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Re: Core 2019
By: Novo on Sun, 30 June 2019 20:12 |
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Re: Core 2019
By: mirek on Mon, 01 July 2019 00:03 |
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Re: Core 2019
By: Tom1 on Mon, 01 July 2019 09:14 |
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Re: Core 2019
By: Novo on Thu, 11 July 2019 19:55 |
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Re: Core 2019
By: mirek on Thu, 11 July 2019 20:14 |
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Re: Core 2019
By: Novo on Thu, 11 July 2019 20:53 |
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Re: Core 2019
By: mirek on Fri, 12 July 2019 10:09 |
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Re: Core 2019
By: Novo on Fri, 12 July 2019 16:50 |
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Re: Core 2019
By: Novo on Thu, 08 August 2019 21:47 |
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Re: Core 2019
By: mirek on Thu, 08 August 2019 22:47 |
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Re: Core 2019
By: mirek on Thu, 08 August 2019 22:53 |
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Re: Core 2019
By: mirek on Thu, 08 August 2019 22:59 |
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Re: Core 2019
By: Novo on Thu, 08 August 2019 23:30 |
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Re: Core 2019
By: mirek on Fri, 09 August 2019 00:05 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 17:59 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 18:01 |
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Re: Core 2019
By: Novo on Fri, 21 June 2019 18:10 |
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