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import numpy as np
import math

def generate_circle_points(diameter, num_points,z):
    angles = np.linspace(0, 2 * np.pi, num_points, endpoint=False)
    x_coords = diameter / 2 * np.cos(angles)
    y_coords = diameter / 2 * np.sin(angles)
    z_coords = np.full(num_points, z)
    return x_coords, y_coords, z_coords

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FROM alpine:3.12

WORKDIR /app/src
RUN echo "https://mirrors.tuna.tsinghua.edu.cn/alpine/v3.12/main" > /etc/apk/repositories \
	&& echo "https://mirrors.tuna.tsinghua.edu.cn/alpine/v3.12/community" >> /etc/apk/repositories \
    && apk update && apk add git \
    && apk add build-base automake autoconf libxml2 fuse-dev curl-dev \
    && git clone https://github.com/s3fs-fuse/s3fs-fuse.git . \
    && ./autogen.sh && ./configure && make && make install

diablowu

G1GC v.s. CMS for Cassandra 2.0

Many people have asked me about using the G1 garbage collector with Cassandra. Since most of my customers are running 2.0 in production the test is with 2.0 for now. Once I script it up I'll re-run the numbers with 2.1.

I also need to re-test with Java 7 and the Oracle JDKs.

TL;DR

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-Xmx8G
-Xms8G
-Xmn2G
-Xss256k
-XX:MaxMetaspaceSize=256M
-XX:+HeapDumpOnOutOfMemoryError
-XX:+AlwaysPreTouch
-XX:+UseTLAB
-XX:+ResizeTLAB
-XX:+UseNUMA

diablowu

# 生成 dhparam.pem 文件, 在命令行执行任一方法:

# 方法1: 很慢
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

# 方法2: 较快
# 与方法1无明显区别. 2048位也足够用, 4096更强
openssl dhparam -dsaparam -out /etc/nginx/ssl/dhparam.pem 4096

diablowu

How to implement a custom search for Hugo usig Gruntjs and Lunrjs.

Requirements

Install the following tools:

• Nodejs
• Gruntjs

Setup

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repos:
- original: https://golang.org/x/arch
  repo: https://github.com/golang/arch
  vcs: git
- original: https://golang.org/x/benchmarks
  repo: https://github.com/golang/benchmarks
  vcs: git
- original: https://golang.org/x/blog
  repo: https://github.com/golang/blog
  vcs: git

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public class Parser {


    public static void main(String[] args) throws IOException, ResourceException, ScriptException {
        GroovyScriptEngine gse = new GroovyScriptEngine(new String[]{"E:/works/dsl/src"});
        Binding b = new Binding();
        Script script = gse.createScript("main.groovy",b);
        script.evaluate("print 123");
        script.run();
//        gse.run("main.groovy",)

diablowu

'use strict'
var co = require('co')
var fs = require('fs')
var cofs = require('co-fs')


var r1 = exports.r1 = function(fileName){
  fs.readFile(fileName, (err,data)=>{
    fs.readFile(data.toString().trim(), (err,data)=>{
      fs.readFile(data.toString().trim(),(err,data)=>{

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export JAVA_OPTS="-Xmx1g -Xms1g -XX:MetaspaceSize=128M -XX:MaxMetaspaceSize=256M $JAVA_OPTS"
export JAVA_OPTS="-XX:+AggressiveOpts -XX:+UseBiasedLocking $JAVA_OPTS"
export JAVA_OPTS="-XX:+UseConcMarkSweepGC -XX:+UseParNewGC  $JAVA_OPTS"
export JAVA_OPTS="-XX:+UseFastAccessorMethods  -XX:+CMSParallelRemarkEnabled $JAVA_OPTS"