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舊 07-28-13, 09:28 PM   #173
KUTAR#
God of Gamer
 
註冊日期: Feb 2006
文章: 9,548
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PS4 contains 5.5GB of RAM for developers – Sony clarifies

Digital Foundry has been handed an internal PS4 document by a “well-placed development source,” which states the system reserves 3.5GB of its 8GB GDDR5 memory for the operating system, which would leave around 4.5GB of space for game code. Other sources have told EG that an additional 1GB of “flexible memory” is reclaimable from the OS reservation. Sony has issued a statement on these claims as well.



Comment from Sony

“We would like to clear up a misunderstanding regarding our “direct” and “flexible” memory systems,” the firm said to Eurogamer in a statement. “The article states that “flexible” memory is borrowed from the OS, and must be returned when requested – that’s not actually the case.

“The actual true distinction is that:

“Direct Memory” is memory allocated under the traditional video game model, so the game controls all aspects of its allocation –

“Flexible Memory” is memory managed by the PS4 OS on the game’s behalf, and allows games to use some very nice FreeBSD virtual memory functionality. However this memory is 100% the game’s memory, and is never used by the OS
, and as it is the game’s memory it should be easy for every developer to use it.

“We have no comment to make on the amount of memory reserved by the system or what it is used for.”

So, basically now it means that: 4.5GB of conventional RAM is available to developers plus the OS-controlled flexible memory; there’s a 1GB virtual address space, split into two areas – 512MB of on-chip RAM is used (the physical area) and another 512MB is “paged” but 5GB of it is available to developers.

“The good news is that the amount is static and not dictated by OS functions as we stated in our original post, making it a lot easier for developers to work with,” said Digital Foundry.

My head hurts no less after that than it did yesterday.
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