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Differences between hard real-time, soft real-time, and firm real-time?
...nics, etc.
Firm/soft real time systems can miss some deadlines, but eventually performance will degrade if too many are missed. A good example is the sound system in your computer. If you miss a few bits, no big deal, but miss too many and you're going to eventually degrade the system. Similar w...
What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...d have worked as well as these two numbers?
Not every number would be equally "good". So, no.
Seeding Strategies
There are differences in the default-seeding schema between different versions and implementation of the JRE.
public Random() { this(System.currentTimeMillis()); }
public Ra...
const vs constexpr on variables
...u can not modify them. However only PI2 is a compile-time constant. It shall be initialized at compile time. PI1 may be initialized at compile time or run time. Furthermore, only PI2 can be used in a context that requires a compile-time constant. For example:
constexpr double PI3 = PI1; // er...
ScalaTest in sbt: is there a way to run a single test without tags?
...ldcard, you could specify the full path com.example.specs.YourTestClass.)
All tests within that test class will be executed. Presumably you're most concerned with failing tests, so correct any failing implementations and then run:
test:testQuick
... which will only execute tests that failed. (Re...
How to check if a given directory exists in Ruby
I am trying to write a script which automatically checks out or updates a Subversion URL based on whether a specified directory exists or not.
...
Storing Image Data for offline web application (client-side storage database)
...; FF for Android
Fetch from web server
using XHR2 (supported on almost all browsers) for blob download from web server
I went with XHR2-Lib by Phil Parsons, which is very much like JQUERY .ajax()
https://github.com/p-m-p/xhr2-lib
Storage
IndexedDB for IE and FireFox
Chrome: Polyfill (blo...
Using CSS how to change only the 2nd column of a table
...ountTable table table td + td{
background: red
}
Note: this works for all browsers (Modern and old ones) that's why I added my answer to an old question
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How to get a list of all valid IP addresses in a local network? [closed]
Is there a way to get a list of all valid IP addresses in a local network?
3 Answers
3...
Drawing Isometric game worlds
...loop with fairly straight forward logic that works consistently throughout all tiles.
Disadvantage:
One downside to that approach is that the x and y coordinates of the tiles on the map will increase in diagonal lines, which might make it more difficult to visually map the location on the screen t...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这茬儿，所以问题的序幕就这样拉开...