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Context switches much slower in new linux kernels
...you can do this by adding them to the GRUB_CMDLINE_LINUX_DEFAULT entry in /etc/default/grub and then running update-grub. The boot parameters to add are:
intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll
Here are the gory details about what the three boot options do:
Setting intel_idle.ma...
Why do we need extern “C”{ #include } in C++?
...nd both the .c and .cpp files are compiled with the C++ compiler (g++, cc, etc) then it isn't really needed, and may even cause linker errors. If your build process uses a regular C compiler for util.c, then you will need to use extern "C" when including util.h.
What is happening is that C++ encode...
What's the difference between dynamic (C# 4) and var?
...e in a shower of sparks.
With dynamic, properties / methods / operators / etc are resolved at runtime, based on the actual object. Very handy for talking to COM (which can have runtime-only properties), the DLR, or other dynamic systems, like javascript.
...
Why can templates only be implemented in the header file?
... boxing, needing to pass function pointers to allocators and constructors, etc. The intention of C++ templates is to avoid having to write nearly identical class MyClass_int, class MyClass_float, etc, but to still be able to end up with compiled code that is mostly as if we had written each version ...
URL rewriting with PHP
...s far more flexibility in parsing URLs, config and database dependent URLs etc. For sporadic usage the hardcoded rewrite rules in .htaccess will do fine though.
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Best way to use PHP to encrypt and decrypt passwords? [duplicate]
...rmation for my users on my website, aka rapidshare username and passwords, etc... I want to keep information secure, but I know that if I hash their information, I can't retrieve it for later use.
...
Fast Bitmap Blur For Android SDK
...p, width, height, false);
Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
if (radius < 1) {
return (null);
}
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int[] pix = new int[w * h];
Log.e("pix", w + " " + h + " " + pix.length);
...
Delete files older than 15 days using PowerShell
...ases as the OP is new to PowerShell and may not understand what gci, ?, %, etc. are.
$limit = (Get-Date).AddDays(-15)
$path = "C:\Some\Path"
# Delete files older than the $limit.
Get-ChildItem -Path $path -Recurse -Force | Where-Object { !$_.PSIsContainer -and $_.CreationTime -lt $limit } | Remove...
Named routes _path vs _url
...
As the other answers explain, you should use _url in email links, etc.
But I would like to add that you should also use _url in redirects, as explained here:
https://www.ruby-forum.com/topic/101346#221052
and, here:
http://viget.com/extend/rails-named-routes-path-vs-url
You can also t...
How to decorate a class?
...ython 2.7, (and @wraps, which maintains the original function's docstring, etc.):
def dec(klass):
old_foo = klass.foo
@wraps(klass.foo)
def decorated_foo(self, *args ,**kwargs):
print('@decorator pre %s' % msg)
old_foo(self, *args, **kwargs)
print('@decorator pos...