burnoo

private class MutableStateAdapter<T>(
    private val state: State<T>,
    private val mutate: (T) -> Unit
) : MutableState<T> {

    override var value: T
        get() = state.value
        set(value) {
            mutate(value)
        }

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

stvhwrd

The best way to download a website for offline use, using wget

There are two ways - the first way is just one command run plainly in front of you; the second one runs in the background and in a different instance so you can get out of your ssh session and it will continue.

First make a folder to download the websites to and begin your downloading: (note if downloading www.SOME_WEBSITE.com, you will get a folder like this: /websitedl/www.SOME_WEBSITE.com/)

STEP 1:

hellerbarde

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

jboner

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