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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
... 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc...
How to convert linq results to HashSet or HashedSet
...f T explicitly:
var query = from i in Enumerable.Range(0, 10)
select new { i, j = i + 1 };
var resultSet = query.ToHashSet();
You can't do that with an explicit call to the HashSet<T> constructor. We're relying on type inference for generic methods to do it for us.
Now you coul...
WCF - How to Increase Message Size Quota
...the issue:
Right-Click on the Config File node at the bottom of the tree
Select Edit with SvcConfigEditor
A list of editable settings will appear, including MaxBufferSize.
Note: Auto-generated proxy clients also set MaxBufferSize to 65536 by default.
...
Warning - Build path specifies execution environment J2SE-1.4
... "JRE System Library[J2SE 1.4]"
Click Add Library -> JRE System Library
Select the new "Execution Environment" or Workspace default JRE
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foll...
How to update a menu item shown in the ActionBar?
... set a condition in oncreateOptionMenu().
For example:
Boolean mISQuizItemSelected = false;
/**
* Called to inflate the action bar menus
*
* @param menu
* the menu
*
* @return true, if successful
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu ite...
Change C++/CLI project to another framework than 4.0 with vs2010
... the Platform Toolset setting in the General property page. You must then select "v90" to get a proper build that targets 3.5. It is however clumsy, you must have all intermediate versions of VS installed on the machine to have that selection available.
Why you need VS2008 installed requires an e...
How do I add a library project to Android Studio?
..., go to Project Structure -> under Modules just hit the plus button and select Import Existing Project and import actionbarsherlock. Then synchronise your Gradle files.
If you face the error
Error: The SDK Build Tools revision (xx.x.x) is too low. Minimum
required is yy.y.y
just open the...
Composer Warning: openssl extension is missing. How to enable in WAMP
... Answer also works for EasyPHP (right-click system tray EasyPHP icon, select Configuration | PHP, which opens php.ini in Notepad, search for openssl, uncomment the line)
– stifin
Jan 21 '15 at 12:57
...
Multiple cases in switch statement
...
This syntax is from the Visual Basic Select...Case Statement:
Dim number As Integer = 8
Select Case number
Case 1 To 5
Debug.WriteLine("Between 1 and 5, inclusive")
' The following is the only Case clause that evaluates to True.
Case 6, ...
How do I use LINQ Contains(string[]) instead of Contains(string)
...re that the query can be used with more providers.
var uids = arrayofuids.Select(id => int.Parse(id)).ToList();
var selected = table.Where(t => uids.Contains(t.uid));
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