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20 Φεβ 2024 · Data structure alignment is the way data is arranged and accessed in computer memory. Data alignment and Data structure padding are two different issues but are related to each other and together known as Data Structure alignment.
16 Ιουλ 2011 · 32-bit processors have 2^32 possible addresses, while current 64-bit processors have a 48-bit address space. My expectation was that if it's a 64-bit processor, the address space should also be 2^64. So I was wondering what is the reason for this limitation?
25 Ιουλ 2010 · A 64-bit machine should be able to address up to 2 64 addressable units (in architectures designed over the last few decades, addressable units are invariably bytes, a.k.a. octets). If you define a "gigabyte" as 2 30 addressable units, then yes, 2 34 gigabytes would be another way to express the same count.
The article talks about how the processor can reference (or address) the memory. In all modern architectures memory is byte-addressable, which means that every byte-sized memory cell has a number (its address), which the CPU uses to identify that cell.
Help you learn about: The memory / storage hierarchy. Locality and caching. Virtual memory. How the hardware and OS give application programs the illusion of a large, contiguous, private address space. Virtual memory is one of the most important concepts in system programming.
Let’s see how this works using a small DM cache with 8 lines where each cache line contains a single word (4 bytes) of data. Here’s a CPU request for the location at byte address 0xE8. Since there 4 bytes of data in each cache line, the bottom 2 address bits indicate the appropriate byte offset into the cached word.
10 Ιαν 2020 · Taking advantage of the unique characteristics of persistent memory, such as byte addressability, persistence, and update in place, allows us to build data structures that are much faster than any data structure requiring serialization or flushing to a disk.
