How do I dropdown?
This is how you dropdown.
<details> <summary>How do I dropdown?</summary> <br> This is how you dropdown.
componentDidUpdate(prevProps) { | |
console.log('Rrow update diff:'); | |
const now = Object.entries(this.props); | |
const added = now.filter(([key, val]) => { | |
if (prevProps[key] === undefined) return true; | |
if (prevProps[key] !== val) { | |
console.log(`${key} | |
- ${JSON.stringify(val)} |
<details> <summary>How do I dropdown?</summary> <br> This is how you dropdown.
Shut down foreman-tasks:
service foreman-tasks stop
Open the rails console:
foreman-rake console
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
Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |