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Jennifer Konikowski
November 23, 2016
Technology
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Caches
A quick overview of how caches work, given at PyLadies Boston.
Jennifer Konikowski
November 23, 2016
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Transcript
CACHES the reason your computer is so darn fast
BASIC IDEA
BASIC IDEA Processor Bus Main Memory
BASIC IDEA Processor Bus* Main Memory *communication system that transfers
data between components inside a computer*
BASIC IDEA Processor Cache Bus Main Memory
BASIC IDEA Processor Cache Bus Main Memory
BASIC IDEA Processor Cache Bus Main Memory
BASIC IDEA Processor Cache Bus Main Memory
BASIC IDEA Processor Cache Bus Main Memory
HOW DO THEY WORK?
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 0 4 0 0 5 0 6 0 7 0 8 0 Main Mem Addresses: 438 439 534 473 434 535
DIRECT MAPPED Tag Slot Block Offset 4 3 8 4
3 9 5 3 4 4 7 3 4 3 4 5 3 5 Main Mem Addresses: 438 439 534 473 434 535 First, we split the addresses:
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 1 4 430-439 4 0 0 5 0 6 0 7 0 8 0 Main Mem Addresses: 438 439 534 473 434 535 miss!
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 1 4 430-439 4 0 0 5 0 6 0 7 0 8 0 Main Mem Addresses: 438 439 534 473 434 535 miss! hit!
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 1 5 530-539 4 0 0 5 0 6 0 7 0 8 0 Main Mem Addresses: 438 439 534 473 434 535 miss! hit! miss!
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 1 5 530-539 4 0 0 5 0 6 0 7 1 4 470-479 8 0 Main Mem Addresses: 438 439 534 473 434 535 miss! hit! miss! miss!
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 1 4 430-439 4 0 0 5 0 6 0 7 1 4 470-479 8 0 Main Mem Addresses: 438 439 534 473 434 535 miss! hit! miss! miss! miss!
DIRECT MAPPED Slot Valid Block Blocks Copied 0 0 1
0 2 0 3 1 5 530-539 4 0 0 5 0 6 0 7 1 4 470-479 8 0 Main Mem Addresses: 438 439 534 473 434 535 miss! hit! miss! miss! miss! miss!
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 0
0 1 0 1 0 2 0 2 0 3 0 3 0 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 0
0 1 0 1 0 2 0 2 0 3 1 4 430-439 3 0 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535 miss!
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 0
0 1 0 1 0 2 0 2 0 3 1 4 430-439 3 0 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535 miss! hit!
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 0
0 1 0 1 0 2 0 2 0 3 1 4 430-439 3 1 5 530-539 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535 miss! hit! miss!
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 4
400-409 0 0 1 0 1 0 2 0 2 0 3 1 4 430-439 3 1 5 530-539 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535 miss! hit! miss! miss!
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 4
400-409 0 0 1 0 1 0 2 0 2 0 3 1 4 430-439 3 1 5 530-539 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535 miss! hit! miss! miss! hit!
SET ASSOCIATIVE Slot Valid Block Blocks Copied 0 0 4
400-409 0 0 1 0 1 0 2 0 2 0 3 1 4 430-439 3 1 5 530-539 4 0 4 0 Main Mem Addresses: 438 439 534 403 434 535 miss! hit! miss! miss! hit! hit!