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DiveInto / sync-obj-header.sh
Created August 12, 2020 16:15
对比 https://programmer.ink/think/5e2007d7091ed.html
sync.B object internals:
OFFSET SIZE TYPE DESCRIPTION VALUE
0 4 (object header) 05 00 00 00 (00000101 00000000 00000000 00000000) (5)
4 4 (object header) 00 00 00 00 (00000000 00000000 00000000 00000000) (0)
8 4 (object header) 9c aa 16 00 (10011100 10101010 00010110 00000000) (1485468)
12 4 (loss due to the next object alignment)
Instance size: 16 bytes
Space losses: 0 bytes internal + 4 bytes external = 4 bytes total
t1 lock ing
@DiveInto
DiveInto / Dockerfile
Last active February 20, 2020 04:56
for kubebuilder
# https://github.com/kubernetes-sigs/kubebuilder/blob/master/build/thirdparty/linux/Dockerfile
# https://github.com/kubernetes-sigs/kubebuilder/blob/2ea629ba2ebb791aefce579a1e6106caa084df8f/build/thirdparty/linux/Dockerfile
# Copyright 2018 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
@DiveInto
DiveInto / permutations.scala
Created September 15, 2013 14:39
compute all permutations of a string
object per extends App{
def permutations(str: String):List[String] = {
if(str.size == 0)
List("")
else{
val res = {
for{c <- str
per <- permutations(str.replaceFirst(c.toString, ""))
}yield c + per
}
@DiveInto
DiveInto / cache-recursive.scala
Last active December 22, 2015 04:39
I'll speak generally, then. About recursive functions using a cache: they must return, in addition of the result, an upated cache.
/**
* https://class.coursera.org/progfun-002/forum/thread?thread_id=1175#comment-3124
**/
object Main extends App {
class MemoStringFunction[T](f: String => T, base: String) {
private lazy val v = f(base)
private lazy val ts = (for {
tx <- 'a' to 'z'
} yield (tx, new MemoStringFunction(f, base + tx))).toMap
@DiveInto
DiveInto / combination.scala
Last active December 22, 2015 02:28
Functional Programming Principles in Scala week-6 Anagram code snippet
/**
计算全部子集
Input: List( ('a', 2), ('b', 2))
Output:
Nil
List(('a', 1))
List(('a', 2))
@DiveInto
DiveInto / akka.scala
Created November 27, 2012 15:31
Demo of akka actors @ http://typesafe.com/resources/tutorials/getting-started-with-akka-scala.html
/**
* Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
*/
package akka.tutorial.first.scala
import akka.actor._
import akka.routing.RoundRobinRouter
import akka.util.Duration
import akka.util.duration._
@DiveInto
DiveInto / producers.scala
Created November 21, 2012 08:36
Actors in scala: http://www.scala-lang.org/node/242
package examples.actors
import scala.actors.Actor
import scala.actors.Actor._
abstract class Producer[T] {
/** A signal that the next value should be produced. */
private val Next = new Object
@DiveInto
DiveInto / MLeaks.java
Created November 12, 2012 05:19
try leak memory according to http://stackoverflow.com/a/6471947/404145
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class MLeaks {
static byte[] m = new byte[1024 * 1024];
static ThreadLocal<MLeaks> tLocal = new ThreadLocal<MLeaks>(){
@Override
protected MLeaks initialValue()
{
@DiveInto
DiveInto / MongoDB-Error-Codes.txt
Created July 23, 2012 06:21
MongoDB Error Codes
checkout:
https://github.com/mongodb/mongo/blob/master/docs/errors.md
@DiveInto
DiveInto / install-java.sh
Created June 19, 2012 09:52
install sun-java on ubuntu
$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:sun-java-community-team/sun-java6
$ sudo apt-get update
$ sudo apt-get install sun-java6-jdk
$ sudo apt-get remove openjdk-6-jdk --purge -y
$ sudo apt-get autoremove
sudo update-java-alternatives -s java-6-sun