...
| Panel | ||||||
|---|---|---|---|---|---|---|
| ||||||
Note: 1000 nanoseconds = 1microsecond 1000microseconds = 1millisecond 1000milliseconds = 1second |
Reading 4KB randomly from an SSD takes 150 microseconds
Reading 1MB sequentially from cache memory takes 250 microseconds
Reading 1MB sequentially from an SSD takes 1,000 microseconds or 1 millisecond
Reading 1MB sequentially from disk (HDDs) takes 20,000 microseconds or 20 milliseconds,
Reading from disk takes 80 times longer than reading from an in-memory cache!