//在你的项目根目录下创建gulpfile.js，代码如下：
 
// 引入 gulp
var gulp = require('gulp');
 
// 引入组件
var htmlmin = require('gulp-htmlmin'), //html压缩
    imagemin = require('gulp-imagemin'),//图片压缩
    pngcrush = require('imagemin-pngcrush'),
    minifycss = require('gulp-minify-css'),//css压缩
    jshint = require('gulp-jshint'),//js检测
    uglify = require('gulp-uglify'),//js压缩
    concat = require('gulp-concat'),//文件合并
    rename = require('gulp-rename'),//文件更名
    notify = require('gulp-notify');//提示信息
 
// 压缩html
gulp.task('html', function() {
  return gulp.src('src/*.html')
    .pipe(htmlmin({collapseWhitespace: true}))
    .pipe(gulp.dest('./dest'))
    .pipe(notify({ message: 'html task ok' }));
 
});
 
// 压缩图片
gulp.task('img', function() {
  return gulp.src('src/images/*')
    .pipe(imagemin({
        progressive: true,
        svgoPlugins: [{removeViewBox: false}],
        use: [pngcrush()]
    }))
    .pipe(gulp.dest('./dest/images/'))
    .pipe(notify({ message: 'img task ok' }));
});
 
// 合并、压缩、重命名css
gulp.task('css', function() {
  return gulp.src('src/css/*.css')
    .pipe(concat('main.css'))
    .pipe(gulp.dest('dest/css'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(minifycss())
    .pipe(gulp.dest('dest/css'))
    .pipe(notify({ message: 'css task ok' }));
});
 
// 检查js
gulp.task('lint', function() {
  return gulp.src('src/js/*.js')
    .pipe(jshint())
    .pipe(jshint.reporter('default'))
    .pipe(notify({ message: 'lint task ok' }));
});
 
// 合并、压缩js文件
gulp.task('js', function() {
  return gulp.src('src/js/*.js')
    .pipe(concat('all.js'))
    .pipe(gulp.dest('dest/js'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(uglify())
    .pipe(gulp.dest('dest/js'))
    .pipe(notify({ message: 'js task ok' }));
});
 
// 默认任务
gulp.task('default', function(){
  gulp.run('img', 'css', 'lint', 'js', 'html');
 
  // 监听html文件变化
  gulp.watch('src/*.html', function(){
    gulp.run('html');
  });
 
  // Watch .css files
  gulp.watch('src/css/*.css', ['css']);
 
  // Watch .js files
  gulp.watch('src/js/*.js', ['lint', 'js']);
 
  // Watch image files
  gulp.watch('src/images/*', ['img']);
});

每次新建节点时，直接申请一个页的空间，这样就保证一个节点物理上也存储在一个页里，加之计算机存储分配都是按页对齐的，就实现了一个结点只需一次I/O。
假设 B-Tree 的高度为 h,B-Tree中一次检索最多需要h-1次I/O（根节点常驻内存），渐进复杂度为O(h)=O(logdN)O(h)=O(logdN)。一般实际应用中，出度d是非常大的数字，通常超过100，因此h非常小（通常不超过3）。
而红黑树这种结构，h明显要深的多。由于逻辑上很近的节点（父子）物理上可能很远，无法利用局部性，所以红黑树的I/O渐进复杂度也为O(h)，效率明显比B-Tree差很多。

Found one Java-level deadlock:
=============================
"Thread-1":
  waiting to lock monitor 0x00007fe6d48432b8 (object 0x00000007d558e9d8, a java.lang.Object),
  which is held by "Thread-0"
"Thread-0":
  waiting to lock monitor 0x00007fe6d4844758 (object 0x00000007d558e9e8, a java.lang.Object),
  which is held by "Thread-1"
Java stack information for the threads listed above:
===================================================
"Thread-1":
	at com.zsr.test.lock.TestDeadLock$2.run(TestDeadLock.java:39)
	- waiting to lock <0x00000007d558e9d8> (a java.lang.Object)
	- locked <0x00000007d558e9e8> (a java.lang.Object)
	at java.lang.Thread.run(Thread.java:745)
"Thread-0":
	at com.zsr.test.lock.TestDeadLock$1.run(TestDeadLock.java:23)
	- waiting to lock <0x00000007d558e9e8> (a java.lang.Object)
	- locked <0x00000007d558e9d8> (a java.lang.Object)
	at java.lang.Thread.run(Thread.java:745)
Found 1 deadlock.

 num     #instances         #bytes  class name
----------------------------------------------
   1:        962520       23100480  java.lang.Long
   2:        481260       19250400  com.ximalaya.test.Ip
   3:        962779       15404464  java.lang.Integer
   4:        481300       15401600  java.util.HashMap$Entry
   5:          6362        9556232  [I
   6:            19        7341744  [Ljava.util.HashMap$Entry;
   7:           319        2174856  [Ljava.lang.Object;
   8:          6060         781024  <methodKlass>
   9:          6060         692032  <constMethodKlass>
  10:           415         486208  <constantPoolKlass>
  11:           378         296288  <constantPoolCacheKlass>
  12:           415         285880  <instanceKlassKlass>
  13:          1358         156272  [C
  14:           573          94240  [B
  15:           125          52928  <methodDataKlass>
  16:           478          46680  java.lang.Class
  17:           704          45152  [[I
  18:           631          38168  [S
  19:          1334          32016  java.lang.String
  20:            46          25024  <objArrayKlassKlass>
  21:           101           6464  java.net.URL
  22:            79           5688  java.lang.reflect.Field
  23:             8           4352  <typeArrayKlassKlass>
  24:            96           3840  java.util.LinkedHashMap$Entry
  25:           119           3808  java.util.Hashtable$Entry
  26:            94           3760  java.lang.ref.SoftReference
  27:            91           2912  java.util.concurrent.ConcurrentHashMap$HashEntry
  28:            61           2432  [Ljava.lang.String;