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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...STL（中国系统与科技开发中心）的软件工程师。他在复旦大学获得了计算机科学专业的学士与硕士学位。目前他在 IBM SVC Agent 开发小组从事研发工作。
参考资料
参考 Linux Man Pages获取 ulimit 信息。
在 developerWorks Linux 专...
Why does find -exec mv {} ./target/ + not work?
....
find -exec command {} \;
For each result, command {} is executed. All occurences of {} are replaced by the filename. ; is prefixed with a slash to prevent the shell from interpreting it.
find -exec command {} +
Each result is appended to command and executed afterwards. Taking the command leng...
Line-breaking widget layout for Android
...time and "wrapping" to the next line as needed.
*
* Code licensed under CC-by-SA
*
* @author Henrik Gustafsson
* @see http://stackoverflow.com/questions/549451/line-breaking-widget-layout-for-android
* @license http://creativecommons.org/licenses/by-sa/2.5/
*
*/
public class PredicateLayo...
C++11 rvalues and move semantics confusion (return statement)
...
@Deduplicator: You are correct. I was not speaking as accurately as I intended. I meant that multiple return statements do not forbid the compiler from RVO (even though it does make it impossible to implement), and therefore the return expression is still considered an rvalue.
...
How do I achieve the theoretical maximum of 4 FLOPs per cycle?
...ll.
This code has been tested to work well on Visual Studio 2010/2012 and GCC 4.6.ICC 11 (Intel Compiler 11) surprisingly has trouble compiling it well.
These are for pre-FMA processors. In order to achieve peak FLOPS on Intel Haswell and AMD Bulldozer processors (and later), FMA (Fused Multiply Add...
When to use , tag files, composite components and/or custom components?
...tead of a component.
Examples:
Custom Facelet component in JSF
How can I access the content of something created with <ui:define> programmatically?
Conditional render in tagfile depending on whether the attribute is specified or not
Performing a redirect, when conversion / validation associat...
Named colors in matplotlib
... gives a good overview.
I updated the image and code to reflect that 'rebeccapurple' has been added and the three sage colors have been moved under the 'xkcd:' prefix since I posted this answer originally.
I really didn't change much from the matplotlib example, but here is the code for complete...
How does a public key verify a signature?
... have) that is where the trust comes from. EVERYONE has (or should have) access to the signer's public key.
So, to validate a digital signature, the recipient
Calculates a hash of the same data (file, message, etc.),
Decrypts the digital signature using the sender's PUBLIC key, and
Compares...
How can I change the image of an ImageView? [duplicate]
..."fill_parent"
android:layout_height="fill_parent"
android:background="#cc8181"
>
<ImageView
android:id="@+id/image"
android:layout_width="50dip"
android:layout_height="fill_parent"
android:src="@drawable/icon"
android:layout_marginLeft="3dip"
andro...
SQL WITH clause example [duplicate]
...]
[WHERE <join_condition>]
In the syntax documentation above, the occurrences of alias_name is a meaningful name you would give to the sub-query after the AS clause. Each sub-query should be separated with a comma Example for WITH statement. The rest of the queries follow the standard format...