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How does the compilation/linking process work?
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The skinny is that a CPU loads data from memory addresses, stores data to memory addresses, and execute instructions sequentially out of memory addresses, with some conditional jumps in the sequence of instructions processed. Each of these three ...
What is the real overhead of try/catch in C#?
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This is unfortunate as no saving of a few nanoseconds here and there of CPU time is likely to make up for many accumulated hours of manual optimisation by humans. Which does your boss pay more for: an hour of your time, or an hour with the computer running? At what point do we pull the plug and a...
Should CSS always preceed Javascript?
... support speculative parsing. I suspect it might be turned off due to the CPU, memory, and/or network constraints inherent to mobile devices.
Code
Forgive the sloppiness – this was Q&D.
app.js
var express = require('express')
, app = express.createServer()
, fs = require('fs');
app.liste...
What does the git index contain EXACTLY?
...ex Entry Offset Table (IEOT) extension
This patch enables addressing the CPU cost of loading the index by adding
additional data to the index that will allow us to efficiently multi-
thread the loading and conversion of cache entries.
It accomplishes this by adding an (optional) index extension th...
Best practices for circular shift (rotate) operations in C++
...shld edi,edi,7 which is slower and takes more bytes than rol edi,7 on some CPUs (especially AMD, but also some Intel), when BMI2 isn't available for rorx eax,edi,25 to save a MOV.
MSVC: x86-64 CL19: Only recognized for constant-count rotates. (The wikipedia idiom is recognized, but the branch and A...
Big-O for Eight Year Olds? [duplicate]
...n elements will be equal to A f(n) + B (measured in, say, clock cycles or CPU operations). It's key to understanding that you also have these constants A and B, which arise from the specific implementation. B represents essentially the "constant overhead" of your operation, for example some preproc...
Why is it bad practice to call System.gc()?
...the garbage collector explicitly. Calling the GC at the wrong time wastes CPU cycles. You (the programmer) do not have enough information to determine when the right time is ... but the JVM does.
– Stephen C
Oct 6 '11 at 8:16
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Are Exceptions in C++ really slow
... handler)
So, mostly cache misses, and thus not trivial compared to pure CPU code.
Note: for more details, read the TR18015 report, chapter 5.4 Exception Handling (pdf)
So, yes, exceptions are slow on the exceptional path, but they are otherwise quicker than explicit checks (if strategy) in gene...
Caveats of select/poll vs. epoll reactors in Twisted
...are active at any given time.
All this means that epoll will lead to less CPU usage for most workloads. As far as memory usage goes, it's a bit of a toss up. select does manage to represent all the necessary information in a highly compact way (one bit per file descriptor). And the FD_SETSIZE (t...
How do you convert a byte array to a hexadecimal string, and vice versa?
...tation. Its safe variant is about 30% faster than the current leader on my CPU. The unsafe variants are even faster. stackoverflow.com/a/24343727/445517
– CodesInChaos
Jun 21 '14 at 17:12
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