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Re: New Core [message #46474 is a reply to message #46461]

Sat, 14 May 2016 07:52

mirek is currently offline

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

cbpporter wrote on Thu, 12 May 2016 19:29

And a question: I can fully understand the 16 bit alignment for allocation and I've used a lot in the past SSE, so this is a good move.

But why make the smallest allocation size 32, not 16?

It is related to the implementation of allocator.

In short: There are small blocks and there are large blocks. At some point, I need to know if freed block is small or large. Fast method to do that is to use single bit in address - small blocks are always 32 bytes aligned, large blocks are 32 bytes misaligned. Therefore small block has to be multiple of 32.

Previous core used the same process, but 16 byte misalignment. So the smallest block was 16 bytes and alignment 8 bytes.

Of course, I have tested this (with theide and other apps) and the increase in memory consumption is negligible.

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[Message index]

		New Core By: mirek on Tue, 03 May 2016 16:17
		Re: New Core By: koldo on Wed, 04 May 2016 09:38
		Re: New Core By: cbpporter on Wed, 04 May 2016 14:55
		Re: New Core By: mirek on Thu, 05 May 2016 09:26
		Re: New Core By: cbpporter on Fri, 06 May 2016 10:24
		Re: New Core By: mirek on Fri, 06 May 2016 13:10
		Re: New Core By: mirek on Wed, 11 May 2016 10:54
		Re: New Core By: dolik.rce on Fri, 06 May 2016 22:53
		Re: New Core By: mirek on Sun, 08 May 2016 06:31
		Re: New Core By: dolik.rce on Sun, 08 May 2016 15:37
		Re: New Core By: mirek on Mon, 09 May 2016 11:23
		Re: New Core By: dolik.rce on Mon, 09 May 2016 16:32
		Re: New Core By: mirek on Mon, 09 May 2016 17:25
		Re: New Core By: dolik.rce on Mon, 09 May 2016 20:51
		Re: New Core By: mirek on Wed, 11 May 2016 10:40
		Re: New Core By: dolik.rce on Thu, 12 May 2016 06:42
		Re: New Core By: mirek on Sat, 14 May 2016 08:00
		Re: New Core By: Zbych on Sun, 08 May 2016 18:08
		Re: New Core By: mirek on Mon, 09 May 2016 11:23
		Re: New Core By: mr_ped on Tue, 10 May 2016 00:31
		Re: New Core By: Mindtraveller on Tue, 10 May 2016 18:46
		Re: New Core By: mirek on Wed, 11 May 2016 10:33
		Re: New Core By: Mindtraveller on Wed, 11 May 2016 15:30
		Re: New Core By: cbpporter on Wed, 11 May 2016 15:32
		Re: New Core By: mirek on Wed, 11 May 2016 18:40
		Re: New Core By: cbpporter on Thu, 12 May 2016 03:04
		Re: New Core By: Mindtraveller on Thu, 12 May 2016 15:10
		Re: New Core By: mirek on Sat, 14 May 2016 09:03
		Re: New Core By: Mindtraveller on Sat, 14 May 2016 23:57
		Re: New Core By: mirek on Sun, 15 May 2016 20:40
		Re: New Core By: mirek on Wed, 11 May 2016 10:34
		Re: New Core By: Novo on Thu, 12 May 2016 04:45
		Re: New Core By: mirek on Thu, 12 May 2016 09:09
		Re: New Core By: Novo on Thu, 12 May 2016 16:23
		Re: New Core By: mirek on Sat, 14 May 2016 07:59
		Re: New Core By: Novo on Fri, 03 June 2016 01:23
		Re: New Core By: Novo on Thu, 12 May 2016 17:08
		Re: New Core By: cbpporter on Thu, 12 May 2016 19:29
		Re: New Core By: cbpporter on Fri, 13 May 2016 16:48
		Re: New Core By: cbpporter on Fri, 13 May 2016 17:05
		Re: New Core By: cbpporter on Tue, 17 May 2016 11:18
		Re: New Core By: mirek on Wed, 18 May 2016 14:25
		Re: New Core By: mirek on Wed, 18 May 2016 14:36
		Re: New Core By: cbpporter on Wed, 18 May 2016 15:24
		Re: New Core By: mirek on Wed, 18 May 2016 20:44
		Re: New Core By: cbpporter on Wed, 18 May 2016 21:53
		Re: New Core By: mdelfede on Sat, 21 May 2016 01:22
		Re: New Core By: mirek on Sat, 21 May 2016 13:30
		Re: New Core By: mirek on Sat, 14 May 2016 07:52
		Re: New Core By: mirek on Sat, 14 May 2016 08:56
		Re: New Core By: mirek on Sat, 21 May 2016 13:40

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