ChenYuan zjuchenyuan

By default Linux distros are unoptimized in terms of I/O latency. So, here are some tips to improve that.

Most apps still don't do multi-threaded I/O access, so it's a thread-per-app which makes per-app speed always bottlenecked by single-core CPU performance (that's not even accounting for stuttering on contention between multiple processes), so even with NVMe capable of 3-6 GB/s of linear read you may get only 1-2 GB/s with ideal settings and 50-150/100-400 MB/s of un/buffered random read (what apps actually use in real life) is the best you can hope for.

All writes are heavily buffered on 3 layers (OS' RAM cache, device's RAM cache, device's SLC-like on-NAND cache), so it's difficult to get real or stable numbers but writes are largelly irrelevant for system's responsiveness, so they may be sacrificed for better random reads.

The performance can be checked by:

`fio --name=read --readonly --rw={read/randread} --ioengine=libaio --iodepth={jobs_per_each_worker's_command} --bs={4k/2M} --direct={0/1} --num

Overview

Syncing an Ethereum node is largely reliant on latency and IOPS, I/O Per Second, of the storage. Budget SSDs will struggle to an extent, and some won't be able to sync at all. For simplicity, this page treats IOPS as a proxy for/predictor of latency.

This document aims to snapshot some known good and known bad models.

The drive lists are ordered by interface and then by capacity and alphabetically by vendor name, not by preference. The lists are not exhaustive at all. @mwpastore linked a filterable spreadsheet in comments that has a far greater variety of drives and their characteristics. Filter it by DRAM yes, NAND Type TLC, Form Factor M.2, and desired capacity.

For size, 4TB comes recommended as of mid 2024. The smaller 2TB drive should last an Ethereum full node until early 2025 or thereabouts, with crystal ball uncertainty. The Portal team aim to make 2TB [last forever with EIP-4444](https://

A 10M USD RUG on Moonriver

Warning: The following analysis may contain incorrect information, please verify everything yourself before believing in these info.

Would be nice to have someone better in on-chain analysis to double check these.

Background

SatrunBeam Finance was a yield aggregator on Moonriver, a EVM-Compatible parachain on Kusama in the Polkadot ecosystem.

It attracted several millions of liquidity within a month. The team is anon and they claimed that the contracts are audited by BitRise whose domain name was only registered on 2022-08-22 (https://who.is/whois/bitriseaudits.com). And the contracts were never actually verified on the block explorer.

	// We support the GET, POST, HEAD, and OPTIONS methods from any origin,
	// and allow any header on requests. These headers must be present
	// on all responses to all CORS preflight requests. In practice, this means
	// all responses to OPTIONS requests.
	const corsHeaders = {
	"Access-Control-Allow-Origin": "*",
	"Access-Control-Allow-Methods": "GET,HEAD,POST,OPTIONS",
	"Access-Control-Max-Age": "86400",
	}

	"""
	say you have a private repo, which is not suitable for push to github
	but you want github to show your activity for this repo

	so, this script will help you sync commit message to `githubrepo`, using empty commits

	used commands:
	git log --all '--pretty=format:%ad\|%s'
	git commit -m "message" --date "Sun Jun 17 12:48:07 2018 +0800" --allow-empty
	"""

	import re
	import json
	from mitmproxy import ctx
	from urllib.parse import quote
	from pprint import pformat

	def response(flow):
	path = flow.request.path
	if path == '/index/index_one_nine_two/make_question':
	ctx.log.info('Start')

	// demoshell is a nifty beaconing shell useful for demos
	package main

	/*
	* demoshell.go
	* Simple reverse shell used in demos
	* By J. Stuart McMurray
	* Created 20180331
	* Last Modified 20180331
	*/

	import re

	import requests
	from bs4 import BeautifulSoup

	# 赠送的网址(post)
	exchange_url = "http://www.nexushd.org/mybonus.php?action=exchange"

	# 98的帖子网址
	cc98_url = "http://www.cc98.org/dispbbs.asp"

	wget http://archive.ubuntu.com/ubuntu/pool/universe/p/polipo/polipo_1.1.1-8_amd64.deb
	sudo dpkg -i polipo_1.1.1-8_amd64.deb


	// 程序启动器[win32]
	// 一个小玩意，作用就是读取与 exe 同名的 .config 文件，并逐条并行执行，不显示窗口
	// 以 # 打头的行忽略
	// 用于开机挂载一些自带 cmd 窗口的程序
	// 自用 vs2017 编译测试通过

	// ver 1.1
	// 一个新语法：@命令可以等待此命令结束后再继续运行
	// 例如 @ping 127.1 -n 3 等待3秒