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Some Sketches ¯\_(ツ)_/¯

Kaveh Shahbazian dc0d

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Some Sketches ¯\_(ツ)_/¯
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@kachayev
kachayev / channels.erl
Last active December 15, 2017 19:36
Process communication programming
-module(channels).
-compile(export_all).
make() ->
Ref = make_ref(),
Pid = spawn(?MODULE, channel, [Ref]),
{channel, Pid, Ref}.
channel(Ref) ->
receive
@temoto
temoto / aes-cfb-example.go
Created February 27, 2013 22:37
Example of AES (Rijndael) CFB encryption in Go. IMHO, http://golang.org/pkg/crypto/cipher/ could benefit a lot from similar snippet.
package main
import (
"crypto/aes"
"crypto/cipher"
"fmt"
)
func EncryptAESCFB(dst, src, key, iv []byte) error {
aesBlockEncrypter, err := aes.NewCipher([]byte(key))
@drewolson
drewolson / reflection.go
Last active November 21, 2024 15:11
Golang Reflection Example
package main
import (
"fmt"
"reflect"
)
type Foo struct {
FirstName string `tag_name:"tag 1"`
LastName string `tag_name:"tag 2"`
@jboner
jboner / latency.txt
Last active June 8, 2025 17:15
Latency Numbers Every Programmer Should Know
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