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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...库以HBase，cassandra,dynamo为代表，还有其他的图形数据库、对象数据 库、xml数据库等。每种类型的数据库应用的业务领域是不一样的，下面从内存型、关系型、分布式三个维度针对相关的产品做性能可用性等方面的考量分析。
1) ...
How to securely save username/password (local)?
...gt;
<value>AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAAQpgaPYIUq064U3o6xXkQOQAAAAACAAAAAAAQZgAAAAEAACAAAABlQQ8OcONYBr9qUhH7NeKF8bZB6uCJa5uKhk97NdH93AAAAAAOgAAAAAIAACAAAAC7yQicDYV5DiNp0fHXVEDZ7IhOXOrsRUbcY0ziYYTlKSAAAACVDQ+ICHWooDDaUywJeUOV9sRg5c8q6/vizdq8WtPVbkAAAADciZskoSw3g6N9EpX/8FOv+Fe...
Actionbar notification count icon (badge) like Google has
...ounded_square"/>
</RelativeLayout>
drawable-xhdpi/ic_bell.png
A 64x64 pixel image with 10 pixel wide paddings from all sides. You are supposed to have 8 pixel wide paddings, but I find most default items being slightly smaller than that. Of course, you'll want to use different sizes for d...
How can I profile C++ code running on Linux?
... 0.9 0.81 0.081 0.181 0.47012987
0.1 0.8 0.64 0.064 0.245 0.636363636
0.1 0.7 0.49 0.049 0.294 0.763636364
0.1 0.6 0.36 0.036 0.33 0.857142857
0.1 0.5 0.25 0.025 ...
Why does changing 0.1f to 0 slow down performance by 10x?
... depending on whether 0 or 0.1 is used.
Here's the test code compiled on x64:
int main() {
double start = omp_get_wtime();
const float x[16]={1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0,2.1,2.2,2.3,2.4,2.5,2.6};
const float z[16]={1.123,1.234,1.345,156.467,1.578,1.689,1.790,1.812,1.923,2...
User Authentication in ASP.NET Web API
...g role)
{
string[] parts = UTF8Encoding.UTF8.GetString(Convert.FromBase64String(Request.Headers.Authorization.Parameter)).Split(':');
if (parts.Length != 2 || !Membership.ValidateUser(parts[0], parts[1]))
throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.Unau...
What is more efficient? Using pow to square or just multiply it with itself?
...00.011259 00:00:00.011254
3 00:00:00.975658 00:00:00.011254
4 00:00:00.976427 00:00:00.011254
5 00:00:00.973029 00:00:00.011254
2.45829e+52
This is on an Intel Core Duo running Ubuntu 9.10 64bit. Compiled using gcc 4.4.1 with -o2 optimization.
So in C, yes x*x*x will be faster than pow(x, 3),...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...
Hank Gay
64.1k2929 gold badges144144 silver badges216216 bronze badges
answered Sep 12 '08 at 18:42
Ethan Post...
Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...68160001953743683783272702066311903448533894049486008426303248121757146615064636953144900245
174442911064952028008546304
50,000 => a very large number!
I agree with @SB that you should always state your assumptions: Mine is that you don't need to paste twice to double the number of characters. ...
Constant Amortized Time
...count of money
5th room size = fits 32 count of money
6th room size = fits 64 count of money
7th room size = fits 128 count of money
8th room size = fits 256 count of money
9th room size = fits 512 count of money
10th room size= fits 1024 count of money
11th room size= fits 2,048 count of money
...
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