Números útiles de latencia

By dvadell On agosto 6, 2012 · Leave a Comment · In Desarrolladores, HPC

Aunque no de supercomputación, esta puede ser una lista útil de latencias:

### Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns

Branch mispredict ............................ 5 ns

L2 cache reference ........................... 7 ns

Mutex lock/unlock ........................... 25 ns

Main memory reference ...................... 100 ns

Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs

Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs

SSD random read ........................ 150,000 ns = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

Round trip within same datacenter ...... 500,000 ns = 0.5 ms

Read 1 MB sequentially from SSD* ..... 1,000,000 ns = 1 ms

Disk seek ........................... 10,000,000 ns = 10 ms

Read 1 MB sequentially from disk .... 20,000,000 ns = 20 ms

Send packet CA->Netherlands->CA .... 150,000,000 ns = 150 ms

*Assuming ~1GB/sec SSD

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