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What data is stored in Ephemeral Storage of Amazon EC2 instance?
...ion [https://aws.amazon.com/premiumsupport/knowledge-center/instance-store-vs-ebs/] instance store volumes is not persistent through instance stops, terminations, or hardware failures.
Any AMI created from instance stored disk doesn't contain data present in instance store so all instances launched...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...
This is also true for division. MULSS(a,RCPSS(b)) is way faster than DIVSS(a,b). In fact it's still faster even when you increase its precision with a Newton-Raphson iteration.
Intel and AMD both recommend this technique in their optimisation manuals. In applications which don't require IEEE-...
What is the memory consumption of an object in Java?
...ider a class like this:
public class SingleByte
{
private byte b;
}
vs
public class OneHundredBytes
{
private byte b00, b01, ..., b99;
}
On a 32-bit JVM, I'd expect 100 instances of SingleByte to take 1200 bytes (8 bytes of overhead + 4 bytes for the field due to padding/alignment). I'...
Most efficient way to create a zero filled JavaScript array?
...undefined. Example: try new Array(5).forEach(val => console.log('hi')); vs new Array(5).fill(undefined).forEach(val => console.log('hi'));.
– ArneHugo
Jun 2 '16 at 11:03
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Difference between framework and static library in xcode4, and how to call them
... the library is present on the target system. this again is this behaviour-vs.-functionality thing
– Martin Ullrich
Jun 5 '11 at 22:36
...
Fastest way to flatten / un-flatten nested JSON objects
... that's a good point and brings up the difference between synthetic vs real world benchmarking. I'm happy with the performance of the current optimized JS, so no need to use C.
– Louis Ricci
Oct 7 '13 at 13:54
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What is the most accurate way to retrieve a user's correct IP address in PHP?
...would take form of forwarded_for.
Also i didnt see anyone address isset() vs !empty() -- its possible to enter nothing for x_forwarded_for yet still trigger isset() truth resulting in blank var, a way to get around is to use && and combine both as conditions. Keep in mind you can spoof word...
How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?
...in a GUI and you want to have optional scroll bars. You could have Window, VScrollWindow, HScrollWindow, and VHScrollWindow classes or you could make VScroll and HScroll decorators on Window.
– Eva
Mar 21 '13 at 4:48
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Inherit from a generic base class, apply a constraint, and implement an interface in C#
...suppose it also lets you subtly call out when a type declaration is ending vs say a method body declaration.
– Eric Lippert
Jan 6 '10 at 0:21
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Do I really have a car in my garage? [duplicate]
...question would be for me: what is the difference between using abstraction vs. using interfaces - other than the fact that I can have a class-independant method that moves around moveable objects?
– T-Rex
Jul 22 '14 at 12:06
...