|
Operation |
Time in ns |
Time in ms |
Comment |
|
L1 cache reference |
0.5 |
||
|
Branch mispredict |
5 |
||
|
L2 cache reference |
7 |
14x L1 cache |
|
|
Mutex lock/unlock |
25 |
||
|
Main memory reference |
100 |
20x L2 cache, 200x |
|
|
Compress 1K bytes with Zip |
3,000 |
||
|
Send 1K bytes over 1 Gbps network |
10,000 |
0.01 |
|
|
Read 4K randomly from SSD |
150,000 |
0.15 |
|
|
Read 1 MB sequentially from memory |
250,000 |
0.25 |
|
|
Round trip within same datacenter |
500,000 |
0.5 |
|
|
Read 1 MB sequentially from SSD |
1,000,000 |
1 |
4X memory |
|
Disk seek |
10,000,000 |
10 |
20x datacenter roundtrip |
|
Read 1 MB sequentially from disk |
20,000,000 |
20 |
80x memory, 20X SSD |
|
Send packet CA->Netherlands->CA |
150,000,000 |
150 |
1 ns = 10^-9 seconds
1 ms = 10^-3 seconds
Assuming ~1GB/sec SSD