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Is inline assembly language slower than native C++ code?
...ion scheduling, for example, is very hard to tune by hand) and modern CISC CPUs have very long pipelines too.
For some complex microcontrollers even system libraries are written in C instead of assembly because their compilers produce a better (and easy to maintain) final code.
Compilers sometimes...
How to 'bulk update' with Django?
...10's to 100's. The size of the batch that is right for you depends on your CPU and query complexity. This tool is more like a wheel barrow than a dump truck.
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HTTP vs HTTPS performance
...namic vs static content
Client distance to server
Typical session length
Etc (my personal favorite)
Caching behavior of clients
In my experience, servers that are heavy on dynamic content tend to be impacted less by HTTPS because the time spent encrypting (SSL-overhead) is insignificant compared...
How many parameters are too many? [closed]
...pecific cases (calls to OS APIs, routines where optimization is important, etc). I suggest to hide the complexity of these routines by adding a layer of abstraction just above these calls whenever possible.
Nick has some interesting thoughts on this. If you don't want to read his comments, I summari...
Java HashMap performance optimization / alternative
...done simpler as follows: int result = a[0]; result = result * 52 + a[1]; //etc.
– rsp
Nov 19 '09 at 16:20
I agree that...
C# Thread safe fast(est) counter
...d" to (x64).
This "bus lock" statement locks the bus to prevent another CPU from accessing the bus while the calling CPU does its operation. Now, take a look at the C# lock() statement's IL. Here you will see calls to Monitor in order to begin or end a section.
In other words, .Net lock() stat...
Why prefer two's complement over sign-and-magnitude for signed numbers?
...be added. Since you want the most basic operations (addition, subtraction, etc) to be as fast as possible, you need to store numbers in a way that lets you use the simplest algorithms possible.
Additionally, in the "intuitive" storage method, there are two zeroes:
0000 "zero"
1000 "negative zero...
What are Transient and Volatile Modifiers?
...le variable will be read from the computer's main memory, and not from the CPU cache, and that every write to a volatile variable will be written to main memory, and not just to the CPU cache.
2) transient keyword cannot be used along with static keyword but volatile can be used along with static.
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Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
...constant folding, transformation of a switch statement into binary search, etc. Thus the benefits to be gained by allowing the compiler to optimize data structures appear to be less tangible than traditional compiler optimizations.
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What do people find difficult about C pointers? [closed]
...ng a bit too deep in their answers. An understanding of scheduling, actual CPU operations, or assembly-level memory management isn't really required.
When I was teaching, I found the following holes in students' understanding to be the most common source of problems:
Heap vs Stack storage. It is ...