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Increasing the maximum number of TCP/IP connections in Linux
...local_port_range = 32768 61000
net.ipv4.tcp_fin_timeout = 60
This basically means your system cannot consistently guarantee more than (61000 - 32768) / 60 = 470 sockets per second. If you are not happy with that, you could begin with increasing the port_range. Setting the range to 15000 61000 is...
做了个购物清单App后，我才真正搞懂App Inventor 2的变量 - App应用开发 - ...
...局部变量"遮蔽"。
解法：全局变量统一加前缀 g_（如 g_count），或用描述性名称（如 totalItemCount）。
坑3：初始化顺序
在 Screen.Initialize 里先用了变量，再初始化它。变量还没创建就被读取，返回空值。
解法：所有...
Convert integer to binary in C#
...o extra code, just input, conversion and output.
using System;
namespace _01.Decimal_to_Binary
{
class DecimalToBinary
{
static void Main(string[] args)
{
Console.Write("Decimal: ");
int decimalNumber = int.Parse(Console.ReadLine());
int...
select count(*) from table of mysql in php
... to alias the aggregate using the as keyword in order to call it from mysql_fetch_assoc
$result=mysql_query("SELECT count(*) as total from Students");
$data=mysql_fetch_assoc($result);
echo $data['total'];
share
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Hexadecimal To Decimal in Shell Script
...not on his list:
[ghoti@pc ~]$ dc -e '16i BFCA3000 p'
3217698816
But if all you want to do is subtract, why bother changing the input to base 10?
[ghoti@pc ~]$ dc -e '16i BFCA3000 17FF - p 10o p'
3217692673
BFCA1801
[ghoti@pc ~]$
The dc command is "desk calc". It will also take input from st...
Extracting hours from a DateTime (SQL Server 2005)
...e #6 here blogs.sqlsentry.com/aaronbertrand/… and sqlblog.com/blogs/aaron_bertrand/archive/2011/09/20/…
– Aaron Bertrand
Oct 6 '14 at 19:44
4
...
How do I choose between Semaphore and SemaphoreSlim?
...uld be used when "wait times are expected to be very short". That would usually dovetail nicely with the idea that the slim version is more lightweight for most of the trade offs.
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improve th...
What are some compelling use cases for dependent method types?
...argkeys: Tuple[DependentHashKey,DependentHashKey])(func: Env => argkeys._0.ValueType => argkeys._1.ValueType => A): A. We wouldn't use a collection of argument keys, because the element types would be subsumed (unknown at compile-time) in the type of collection.
– Shel...
Do asynchronous operations in ASP.NET MVC use a thread from ThreadPool on .NET 4
...hronous processing in ASP.NET (which is what asynchronous controllers basically represent).
Let's first consider a standard synchronous action:
public ActionResult Index()
{
// some processing
return View();
}
When a request is made to this action a thread is drawn from the thread pool a...
A monad is just a monoid in the category of endofunctors, what's the problem?
...lete and Mostly Wrong History of Programming Languages, in which he fictionally attributes it to Philip Wadler.
The original quote is from Saunders Mac Lane in Categories for the Working Mathematician, one of the foundational texts of Category Theory. Here it is in context, which is probably the bes...