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SQL SELECT speed int vs varchar
...ver see it. Depending upon CPU, implementation (client/server, web/script, etc) you probably will not see it until you hit few hundred comparisons on the DB server (maybe even a couple thousand comparisons before it is noticeable).
To void the incorrect dispute about hash comparisons. Most hashing...
Timer function to provide time in nano seconds using C++
...u are measuring code involving sleep, mutex lock, condition_variable wait, etc, the rdtsc clock is likely to have inaccurate conversions to other units. It is a good idea to set your measurements up so that you can easily change and compare clocks (as shown in this answer).
– ...
What is compiler, linker, loader?
...telligent than an assembler. It checks all kinds of limits, ranges, errors etc. But its program run time is more and occupies a larger part of the memory. It has slow speed. Because a compiler goes through the entire program and then translates the entire program into machine codes. If a compiler ru...
Android AsyncTask threads limits?
... the phone. For all those operations (updates, retrieving data from db and etc.) I use async tasks. As up till now I didn't see why I shouldn't use them, but recently I experienced that if I do some operations some of my async tasks simply stop on pre-execute and don't jump to doInBackground. That w...
Once upon a time, when > was faster than < … Wait, what?
...ntions that we can perform custom depth tests, such as GL_LESS, GL_ALWAYS, etc. He also explains that the actual meaning of depth values (which is top and which isn't) can also be customized. I understand so far. And then the author says something unbelievable:
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Linux日志管理Rsyslog入门 - C/C++ - 清泛网移动版 - 专注C/C++及内核技术
...性能上更为出色，至于孰优孰劣是个仁者见仁智者见智的问题，鉴于多数Linux发行版均选择了Rsyslog，姑且让我随波逐流一次。
如果说Rsyslog有哪些缺点的话，那么兼容性无疑是很显眼的一个，不同版本之间的差异比较大，使用时...
Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?
...quests at a time as long as our system has enough resources (RAM, Network, etc.). How those functions run is THE KEY DIFFERENCE.
-- Hmm, should I be excited now?
-- Maybe :) Node runs a loop over a queue. In this queue are our jobs, i.e, the calls we started to process incoming requests. The most ...
What's the difference between emulation and simulation? [duplicate]
...lements the CPU, the sound chip, the video output, the controller signals, etc. The unmodified code from a NES castridge can be dumped and then the resulting image can be loaded into our emulator and played.
A simulator is a partial implementation of a device/platform, it does just enough for its o...
Android emulator and virtualbox cannot run at same time
... the Virtualbox emulator and unload its driver (vboxdrv) by running 'sudo /etc/init.d/vboxdrv stop'. Google suggests this "solution" on its Android Emulator page in the section about Linux.
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Vsphere 6 集群上 安装 oracle rac 遇到的共享磁盘故障 - 数据库(内核) - ...
...。但是 oracle 启动不了。
分析
经过3天的测试，找问题，依然没有完全解决问题， 从三天的测试结果来看 无非是 SCSI 总线， SCSI 共享总线，和 磁盘锁定，多点写入参数的组合
实验结果如下
SCSI 总线
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