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为维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...
...术注释
调整后的峰值性能（APP）是指数字计算机在进行64位或更多位的浮点加法和乘法运算的调整后的峰值速度。
本技术说明涉及的缩写：
n “数字计算机”中的处理器数量
I 处理器编号（1，……，n）
ti 处理器时钟周期（...
How to enable cURL in PHP / XAMPP
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For Ubuntu (and probably all Debian-Based) Linux Distributions:
sudo apt-get install php5-curl
sudo /etc/init.d/apache2 restart
You might have seen PHP Fatal error: Call to undefined function curl_init() before.
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A fast method to round a double to a 32-bit int explained
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How do I set GIT_SSL_NO_VERIFY for specific repos only?
...n specific http section for your git server and specify which certificate (Base64 encoded) to trust:
~/.gitconfig
[http "https://repo.your-server.com"]
# windows path use double back slashes
# sslCaInfo = C:\\Users\\<user>\\repo.your-server.com.cer
# unix path to certificate (Base64 encoded...
Finding the Eclipse Version Number
...t will print out the full version of currently running Eclipse (or any RCP-based application).
String product = System.getProperty("eclipse.product");
IExtensionRegistry registry = Platform.getExtensionRegistry();
IExtensionPoint point = registry.getExtensionPoint("org.eclipse.core.runtime.products...
How are Python's Built In Dictionaries Implemented?
...49)
When adding entries to the table, we start with some slot, i, that is based on the hash of the key. CPython initially uses i = hash(key) & mask (where mask = PyDictMINSIZE - 1, but that's not really important). Just note that the initial slot, i, that is checked depends on the hash of the k...
Should I use the datetime or timestamp data type in MySQL?
... but it is a cleaner design long-term. Of course, present the info to user based on their current settings. If user wishes to enter "09:00 in Paris", then let them set Paris time, then enter 09:00. Then anyone who is in New York can easily find what time they need to be awake at their time, to telec...
How to find where a method is defined at runtime?
... will return an array with filename and line number.
E.g for ActiveRecord::Base#validates this returns:
ActiveRecord::Base.method(:validates).source_location
# => ["/Users/laas/.rvm/gems/ruby-1.9.2-p0@arveaurik/gems/activemodel-3.2.2/lib/active_model/validations/validates.rb", 81]
For classes ...
ctypes - Beginner
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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What is the most effective way for float and double comparison?
...t the Google C++ Testing Framework contains a nice cross-platform template-based implementation of AlmostEqual2sComplement which works on both doubles and floats. Given that it is released under the BSD license, using it in your own code should be no problem, as long as you retain the license. I ext...