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How to overcome root domain CNAME restrictions?
...mod_rewrite.
We have a client server running Apache 2.2 with just under 3,000 domains and nearly 4,000 redirects, however, the load on the server hover around 0.10 - 0.20.
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WinDbg基础资料（日本語） - IT优秀资料 - 清泛网 - 专注C/C++及内核技术
...--------------------
Tip05: メモリ中の文字情報を表示する
0:000> ~44s
0:044> !teb
TEB at 7ff7f000
ExceptionList: 09e5eeb4
StackBase: 09e60000
StackLimit: 09e50000
...
0:044> dpu 09e50000 09e60000
--------------------------------...
Moving average or running mean
...msum[:-N]) / float(N)
The code to check
In[3]: x = numpy.random.random(100000)
In[4]: N = 1000
In[5]: %timeit result1 = numpy.convolve(x, numpy.ones((N,))/N, mode='valid')
10 loops, best of 3: 41.4 ms per loop
In[6]: %timeit result2 = running_mean(x, N)
1000 loops, best of 3: 1.04 ms per loop
N...
Fastest way to serialize and deserialize .NET objects
... static void Main(string[] args)
{
var count = 100000;
var rnd = new Random(DateTime.UtcNow.GetHashCode());
Console.WriteLine("Generating {0} arrays of data...", count);
var arrays = new List<int[]>();
for (int i = 0; i...
Hash and salt passwords in C#
...
* Version 3:
* PBKDF2 with HMAC-SHA256, 128-bit salt, 256-bit subkey, 10000 iterations.
* Format: { 0x01, prf (UInt32), iter count (UInt32), salt length (UInt32), salt, subkey }
* (All UInt32s are stored big-endian.)
*/
public string HashPassword(string password)
{
var prf = KeyDerivatio...
C# List of objects, how do I get the sum of a property
... @Coops - To answer your question...using a list containing 100,000 objects, each object having a single property of datatype double, summing up the property 1,000 times using solution above (myList.Sum) takes 2.44 seconds compared to 0.98 seconds using foreach. The elapsed time is measur...
how to permit an array with strong parameters
...title"=>"Something", "time_span"=>[{"start"=>"2017-05-06T16:00:00.000Z", "end"=>"2017-05-06T17:00:00.000Z"}]}}
Then this is how I got it to work:
params.require(:link).permit(:title, time_span: [[:start, :end]])
...
Count(*) vs Count(1) - SQL Server
...utation intensive function.
In my test database, t_even is a table with 1,000,000 rows
This query:
SELECT COUNT(SYS_GUID())
FROM t_even
runs for 48 seconds, since the function needs to evaluate each SYS_GUID() returned to make sure it's not a NULL.
However, this query:
SELECT COUNT(*)
FR...
C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
...到：# t实例中的p就是一个野指针
(gdb) p t
$1 = {i = 0, c = 0 '\000', d = 0 '\000', p = 0x4003e0 "1\355I\211\..."}
# 输出t的地址
(gdb) p &t
$2 = (struct test *) 0x7fffffffe5f0
#输出(t.i)的地址
(gdb) p &(t.i)
$3 = (char **) 0x7fffffffe5f0
#输出(t.p)的...
When NOT to use yield (return) [duplicate]
...results show how long it took (in milliseconds) to perform the operation 1,000,000 times. Smaller numbers are better.
In revisiting this, the performance difference isn't significant enough to worry about, so you should go with whatever is the easiest to read and maintain.
Update 2
I'm pretty sur...