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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...
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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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>
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<receiver android:process=":remote" android:name="....
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) * ...
Condition within JOIN or WHERE
...n think of 4 queries in the last week with very different execution plans, CPU times, and logical reads when I moved where predicates to the join.
– marr75
Jun 19 '09 at 16:58
2
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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...
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 often should you use git-gc?
... the user does not know, naturally they complain about 'gc --auto' wasting CPU.
Daemonized gc now saves stderr to $GIT_DIR/gc.log.
Following gc --auto will not run and gc.log printed out until the user removes gc.log.
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How does `scp` differ from `rsync`?
... encryption also has a major impact on your transfer speed, as well as the CPU overhead. (My experience is that rsync can be significantly faster than scp.)
Check out this post for when rsync has encryption on.
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