miguelmota

package main

import (
	"encoding/hex"
	"fmt"
	"github.com/ethereum/go-ethereum/crypto/sha3"
)

func main() {
	hash := sha3.NewKeccak256()

ipolyzos

Notes on Scheduler Tracing in GoLang

$ export GODEBUG=schedtrace=1000

*scheddetail*: setting schedtrace=X and scheddetail=1 causes the scheduler to emit
detailed multiline info every X milliseconds, describing state of the scheduler,
processors, threads and goroutines.

*schedtrace*: setting schedtrace=X causes the scheduler to emit a single line to standard
error every X milliseconds, summarizing the scheduler state.

deepakraous

Introduction

• Ethereum is a world computer.
• Ethereum is a combination of A Singular World State+ A Virtual Machine.
• World State is a collection of all States.
• A State is a collection of Blocks.
• The World State is stored as a Patricia Merkle Trie as per Recursive Length Prefix(RLP) spec in a mini Database.
• Only a Virtual Machine can add a new State.
• The Virtual Machine needs fuel to execute instructions and the fuel is ‘Ether’ to prevent rogue actions.

w3kim

const Caver = require('caver-js');
const caver = new Caver('https://api.baobab.klaytn.net:8651');

const acct = caver.klay.accounts.privateKeyToAccount('your_private_key')
caver.klay.accounts.wallet.add(acct)

/*
  We will use the following contract to demonstrate the use of bytes32:
  
  pragma solidity 0.4.24;

nickcernis

Attempting mysql -u root fails with Access denied for user 'root'@'localhost immediately after doing brew install mariadb and starting mariadb with brew services start mariadb.

To fix it (with MariaDB still running):

1. sudo mysql then enter your Mac user password
2. ALTER USER 'root'@'localhost' IDENTIFIED BY 'newrootpassword'; replacing newrootpassword with the password you wish to use for the MariaDB root user.
3. Ctrl-C to exit mysql.

You should then be able to connect to MariaDB with mysql -u root -p, then entering the root password when prompted.