Availability level | Allowed unavailability window |
per year | |
90% | 36.5 days |
95% | 18.25 days |
99% | 3.65 days |
99.5% | 1.83 days |
99.9% | 8.76 hours |
99.95% | 4.38 hours |
99.99% | 52.6 minutes |
99.999% | 5.26 minutes |
execute typical instruction | 1/1,000,000,000 sec = 1 nanosec |
fetch from L1 cache memory | 0.5 nanosec |
branch misprediction | 5 nanosec |
fetch from L2 cache memory | 7 nanosec |
Mutex lock/unlock | 25 nanosec |
fetch from main memory | 100 nanosec |
send 2K bytes over 1Gbps network | 20,000 nanosec |
read 1MB sequentially from memory | 250,000 nanosec |
fetch from new disk location (seek) | 8,000,000 nanosec |
read 1MB sequentially from disk | 20,000,000 nanosec |
send packet US to Europe and back | 150 milliseconds = 150,000,000 nanosec |
全て読むには購入が必要です