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How to use QueryPerformanceCounter?
... should prevent my thread from getting rescheduled to anything but the 1st CPU core. (Which is obviously only a solution for a testing environment)
– Lucas
May 22 '13 at 11:04
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warning this call is not awaited, execution of the current method continues
...' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. This also causes a new thread to be created, whereas a new thread will not necessarily be created with async/await alone.
– gregsdennis
Feb 26 '15...
Macro vs Function in C
...hurt performance due to code bloat, which reduces the effectiveness of the CPU instruction cache. We can make fast generic data structures in C without using these techniques.
– Sam Watkins
Jun 26 '15 at 3:24
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How to break out of a loop from inside a switch?
... asked me to make the main loop let other threads (or processes) have some CPU time, two solutions come to mind:
Option #1
Readily insert the pause:
while( isValidState() ) {
execute();
sleep();
}
Option #2
Override execute:
void execute() {
super->execute();
sleep();
}
This code...
Alarm Manager Example
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This is working code. It wakes CPU every 10 minutes until the phone turns off.
Add to Manifest.xml:
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<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
...
<receiver android:process=":remote" android:name="....
What is the best way to concatenate two vectors?
... for low iteration count. This assumes a good vector implementation, plus CPU instruction pipeline & [good] branch prediction, but those are pretty reliable assumptions for a modern toolchain and desktop machine. Don't know about smartphones though..
– boycy
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What integer hash function are good that accepts an integer hash key?
... input results in a different output). The algorithm is fast except if the CPU doesn't have a built-in integer multiplication unit. C code, assuming int is 32 bit (for Java, replace >> with >>> and remove unsigned):
unsigned int hash(unsigned int x) {
x = ((x >> 16) ^ x) * ...
In-Place Radix Sort
...aiive representation. Addressing becomes more complex, but the ALU of your CPU has lots of time to spend during all the cache-misses anyway.
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How to handle :java.util.concurrent.TimeoutException: android.os.BinderProxy.finalize() timed out af
...ing most User Land processes for a while, and turning Screen off, reducing CPU cycles, etc. The way this is done - is on a Linux system level where the processes are Paused mid run. This can happen at any time during normal Application execution, but it will stop at a Native system call, as the cont...
How do I detect unsigned integer multiply overflow?
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Some compilers provide access to the integer overflow flag in the CPU which you could then test but this isn't standard.
You could also test for the possibility of overflow before you perform the multiplication:
if ( b > ULONG_MAX / a ) // a * b would overflow
...