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Convert a String In C++ To Upper Case
...ry/cache effects: data is hot in L1 cache the whole time, and we're purely CPU-bound.
boost::to_upper_copy<char*, std::string>(): 198.0s. Yes, Boost 1.58 on Ubuntu 15.10 is really this slow. I profiled and single-stepped the asm in a debugger, and it's really, really bad: there's a dynam...
What is the most efficient Java Collections library? [closed]
...rove didn't outperform the JDK collection classes in both memory usage and CPU time. If you are using objects though (and not primitive types), then I would agree with Alex, fretting over collection impl is not as big of a deal.
– Riyad Kalla
May 3 '11 at 13:...
Why do you not use C for your web apps?
... also made it possible to process more static content - with less powerful CPUs (ANSI C is not only about making dynamic contents fly).
By the way, G-WAN uses C scripts (no C compiler and linker needed) so the compiling/linking cycle/delay does not exist.
In the process of comparing G-WAN to .NET ...
Objective-C implicit conversion loses integer precision 'NSUInteger' (aka 'unsigned long') to 'int'
...t seen any difference. It will only make a difference in apps that use the CPU heavily - games for example would see a benefit compiling for 64 bit.
– Robert J. Clegg
Mar 13 '14 at 19:27
...
PostgreSQL - fetch the row which has the Max value for a column
...xxx_cost values), which is a weighed function estimate of required I/O and CPU resources; you can obtain this by firing up PgAdminIII and running "Query/Explain (F7)" on the query with "Query/Explain options" set to "Analyze"
Quassnoy's query has a cost estimate of 745k (!), and completes in 1.3 s...
Wrapping synchronous code into asynchronous call
...ous API for it.
I'll proceed with the assumption that your "service" is a CPU-bound operation that must execute on the same machine as the web server.
If that's the case, then the next thing to evaluate is another assumption:
I need the request to execute faster.
Are you absolutely sure that...
How does Duff's device work?
... whether the loop is finished and jumping back to the top of the loop. The CPU can run faster when it's executing straight-line code instead of jumping.
The second aspect is the switch statement. It allows the code to jump into the middle of the loop the first time through. The surprising part to m...
“Insufficient Storage Available” even there is lot of free space in device memory
...torage (like a harddrive in a computer). RAM is the "scratchpad" that the CPU uses while it's working and where your applications are loaded while they are running. With all the solid-state storage, the term ROM has really been "muddied". It really comes down to two different types of "memory" 1)...
Why can't enum's constructor access static fields?
...e problem solved via a nested class. Pros: it's shorter and also better by CPU consumption. Cons: one more class in JVM memory.
enum Day {
private static final class Helper {
static Map<String,Day> ABBR_TO_ENUM = new HashMap<>();
}
Day(String abbr) {
this.a...
parseInt vs unary plus, when to use which?
...arseInt beats unary plus on iOS :) This is helpful for web apps with heavy CPU consumption only. As a rule-of-thumb I'd suggest JS opt-guys to consider any JS operator over another one from the mobile performance point of view nowadays.
So, go mobile-first ;)
...