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Difference between volatile and synchronized in Java
...n memory of what has been done are visible to other threads. Because each CPU has several levels of cache between it and main memory, threads running on different CPUs or cores can see "memory" differently at any given moment in time because threads are permitted to obtain and work on private copie...
What's the difference between deadlock and livelock?
...eadlock: situation where nobody progress, doing nothing (sleeping, waiting etc..). CPU usage will be low;
Livelock: situation where nobody progress, but CPU is spent on the lock mechanism and not on your calculation;
Starvation: situation where one procress never gets the chance to run; by pure ba...
PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
...n
pgConnect = pg.connect(dbname= db_name, host='localhost', user= db_user, passwd= db_pass)
# Rename schema with the new name
pgConnect.query("ALTER SCHEMA " + schema_as_template + " RENAME TO " + str(newSchema))
# Dump it
command = 'export PGPASSWORD="' + db_pass + '" && pg_dump -U ' + db...
刘强东“一元年薪”背后的O2O棋局 - 资讯 - 清泛网 - 专注C/C++及内核技术
...类、鲜花、外卖送餐等各类生活服务项目，并基于移动端定位实现2小时内快速送达。
据京东方面透露，“京东到家”如今已开通7个城市，目前该业务订单数量快速增长，盈利模式是京东和超市分成。
刘强东称，长期来看，“...
Why is reading lines from stdin much slower in C++ than Python?
...lly timing the execution of cat, not your benchmark. The 'user' and 'sys' CPU usage displayed by time are those of cat, not your benchmarked program. Even worse, the 'real' time is also not necessarily accurate. Depending on the implementation of cat and of pipelines in your local OS, it is possib...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...哥开始构思第一个方案，我们开始想用统计的方法来解决问题，当我们拿着第一个方案和Ray讨论时，发现不能优雅应对Ray的所有提问：1、测试环境的准确性，失败到底是因为网络的特性导致还是因为用户当前的环境变化导致的...
当ORACLE 11G 遇到 JUNIPER 防火墙 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...掉防火墙改为直连，WINDOWS的IP改为 172.16.110.70/24 没有任何问题。故判断是防火墙的问题。
防火墙策略全开 允许UNTRUNT 到TRUNT ANY 结果还是不行。
开始百度
第一个说法：需要更改windows的注册表
\\HKEY_LOCAL_MACHINE\SOFTW...
Performance optimization strategies of last resort [closed]
...y under a broad range of scenarios, and perform null checks on parameters, etc. By re-implementing a method you may be able to strip out a lot of logic that does not apply in the exact circumstance you are using it.
Down-sides: writing additional code means more surface area for bugs.
Do use library...
How can I pair socks from a pile efficiently?
...re are a constant number of combinations (ownership, color, size, texture, etc.).
Use radix sort. This is only linear time since comparison is not required.
Case 3: The number of combinations is not known in advance (general case).
We have to do comparison to check whether two socks come in pair....
普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...让大家多思考（希望我达到这个目的了）。
解决完一个问题后我们要经常“回头看看”，我们要学习的不是“解决具体问题的办法”而不是“解决问题的方法”。很多朋友通过网络或者同事帮助解决完一个问题之后就没有然后...