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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 27 Jan 2018
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      Fun fact: people like to say that unlike Flash memory, RAM can be read or written to one byte at a time, but that's a lie. A typical DIMM's memory array can only be addressed in 64KiB blocks! Writing one byte means reading 64K, modifying one byte, and writing 64K! (1/n)

      7 replies 118 retweets 299 likes
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    2. Hector Martin‏ @marcan42 27 Jan 2018
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      In fact, *reading* is a destructive operation in RAM. Reading one byte means reading 64K (which destroys it), then writing back the 64K untouched! However, the RAM chips perform this read-write operation when directed, so the 64K doesn't have to go out via the bus and back. (2/n)

      3 replies 10 retweets 41 likes
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    3. Hector Martin‏ @marcan42 27 Jan 2018
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      The difference is that RAM doesn't wear out, so nobody cares that it works this way. The RAM can also combine a long sequence of reads or writes, sequential or scattered, within one page, into one read, a sequence of I/Os, and a write back to the array. (3/n)

      3 replies 6 retweets 34 likes
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    4. Cybergibbons‏ @cybergibbons 27 Jan 2018
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      Replying to @marcan42

      It's also nearly always handled for you in hardware so developers rarely need to care. Flash needs manual read, erase, write on nearly everything.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 27 Jan 2018
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      Replying to @cybergibbons

      Only to the extent that "dumb" Flash controllers still exist. Modern Flash controllers will do read/erase/write/FTL for you much like DRAM controllers will open and close rows for you.

      3:26 AM - 27 Jan 2018
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