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inetkiller.github.io
2013年5月11日
http://inetkiller.github.io/life/2013/05/11/%25e4%25b8%25b2%25e4%25b8%25b2%25e7%2583%25a7
God bless every one.
Linux下生成的文件能超过2G吗？
http://inetkiller.github.io/2014/04/04/linux下生成的文件能超过2G吗
刚才写了一段代码，会生成很大的一个文件，程序执行过程中提示 file too large。 所有打开的文件都有一个当前文件偏移量 current file offset ，简称为 cfo。 读写操作通常开始于 cfo，并且使 cfo 增大. 再看lseek的原型 off t lseek(int handle, off t offset, int fromwhere)。 Lseek所使用的cfo是off t类型的，对于大多数系统，off t类型默认是32位 可用sizeof(off t)查看 ，也就是一个long型的，因此long型的数据只能表示正数到2 32-1，也就是2G。 当写文件的时候，cfo达到了2 32-1 此时文件大小为2G ，再往后就无法表示了，于是会返回file too large的错误。 Lseek函数的原型可在 /usr/include/unistd.h 中查看 unistd.h只是使用extern对lseek函数进行声明，真正定义的位置在内核源码中. Ifndef USE FILE OFFSET64. Define USE FILE OFFSET64 1.
少年，别哭
http://inetkiller.github.io/life/2012/11/07/%25e5%25b0%2591%25e5%25b9%25b4%25ef%25bc%258c%25e5%2588%25ab%25e5%2593%25ad
Java HashMap的死循环
http://inetkiller.github.io/studying/转载/2013/05/10/java-hashmap%25e7%259a%2584%25e6%25ad%25bb%25e5%25be%25aa%25e7%258e%25af
文章出处 酷壳 CoolShell.cn. HashMap通常会用一个指针数组 假设为table[] 来做分散所有的key，当一个key被加入时，会通过Hash算法通过key算出这个数组的下标i，然后就把这个 key, value 插到table[i]中，如果有两个不同的key被算在了同一个i，那么就叫冲突，又叫碰撞，这样会在table[i]上形成一个链表。 我们知道，如果table[]的尺寸很小，比如只有2个，如果要放进10个keys的话，那么碰撞非常频繁，于是一个O(1)的查找算法，就变成了链表遍历，性能变成了O(n)，这是Hash表的缺陷 可参看 Hash Collision DoS 问题. Public V put(K key, V value) { . / 算Hash值 int hash = hash(key.hashCode() ; int i = indexFor(hash, table.length); / 如果该key已被插入，则替换掉旧的value 链接操作 for (Entry e = table[i]; e! Null) { src[j] = null; do { Entry n...
对mysql语句的性能分析与优化
http://inetkiller.github.io/2014/05/20/mysql语句性能分析与优化
2使用show processlist查看查询过程 处于哪个状态 ，完整命令如下 mysql -uroot -p -e ‘show processlist G’ grep state: sort uniq -c sort -rn 此种方法和方法3类似，应该说方法3更好用。 默认是禁止的，需要使用set profiling = 1开启。 然后使用show profile for query n就可以看到对应查询语句的查询执行的每个步骤以及其花费的时间。 使用这种分析方法时，很有可能需要更改配置文件，可以设置成如下形式 log slow queries = /var/log/mysql/mysql-slow.log#日志的存放目录 long query time = 0 / 捕获所有的查询 log-queries-not-using-indexes/ 即使不使用索引也可以被记录. Google上得到答案，将mysql的配置文件my.conf里加上一句innodb flush log at trx commit = 0。 将innodb flush log at trx commit的值设置为0有一个副作用 ...
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