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Latency and CPU speed infomation

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Introduction

In today’s world, where technology is advancing at a fast pace, it is essential to understand the key concepts that govern how our devices function. Two of the most important concepts that determine the performance of a device are latency and CPU speed. In this blog post, we will discuss these two concepts in detail and understand how they impact the functioning of our devices.

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

Latency numbers 2020

Assuming ~1GB/sec SSD

/images/latency-numbers-2019.png

CPU Operation

/images/cpu-operations.png

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