AlexYangYu

Latency Comparison Numbers
--------------------------
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
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms

AlexYangYu

package me.alexyang.deferred;

import com.stumbleupon.async.Callback;
import com.stumbleupon.async.Deferred;
import java.util.ArrayList;
import org.hbase.async.Bytes;
import org.hbase.async.GetRequest;
import org.hbase.async.HBaseClient;
import org.hbase.async.KeyValue;
import org.hbase.async.PutRequest;

AlexYangYu

package me.alexyang.scanner;

import com.stumbleupon.async.Callback;
import com.stumbleupon.async.Deferred;
import java.nio.charset.Charset;
import java.util.ArrayList;
import org.hbase.async.HBaseClient;
import org.hbase.async.KeyValue;
import org.hbase.async.Scanner;

AlexYangYu

package main

import "fmt"

func fibonacci() func() int {
    x, y := 0, 1
    return func () int {
        x, y = x + y, x
        return x
    } 

AlexYangYu

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.vm.box = "precise64"

AlexYangYu

/etc/neutron.conf
[DEFAULT]
debug = False 
verbos = False 
state_path = /var/lib/neutron
lock_path = $state_path/lock
#core_plugin = neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2
core_plugin = neutron.plugins.ml2.plugin.Ml2Plugin
service_plugins = neutron.services.l3_router.l3_router_plugin.L3RouterPlugin
notification_driver = neutron.openstack.common.notifier.rpc_notifier

AlexYangYu

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Description:
#   This application is used to discovery the pyhsical disk by using the MegaCLI tool.
#
# Author: Alex Yang <alex890714@gmail.com>
#

AlexYangYu

#include <stdio.h>
#include <string.h>

struct log {
    char func_name[255];
    char hour[2];
    char minute[2];
    char second[2];
    bool action;
};

AlexYangYu

# Cinder Multi Backend
[root@node-67 ~]# cinder service-list
+------------------+-----------------------------+------+---------+-------+----------------------------+-----------------+
|      Binary      |             Host            | Zone |  Status | State |         Updated_at         | Disabled Reason |
+------------------+-----------------------------+------+---------+-------+----------------------------+-----------------+
| cinder-scheduler |      node-67.domain.tld     | nova | enabled |   up  | 2015-07-30T06:15:50.000000 |       None      |
|  cinder-volume   |   node-67.domain.tld@iscsi  | nova | enabled |   up  | 2015-07-30T06:15:50.000000 |       None      |
|  cinder-volume   | node-70.domain.tld@local-70 | nova | enabled |   up  | 2015-07-30T06:15:55.000000 |       None      |
+------------------+-----------------------------+------+---------+-------+----------------------------+-----------------+
[root@node-67 ~]# cinder type-list