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Graph/f03c5999-eea6-4ed1-a70b-f50d75811c7c

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Performance Optimization

f03c5999-eea6-4ed1-a70b-f50d75811c7c

Performance Optimization

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Updated5/1/2026

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24 linked nodes

PERTAIN_TOSolution

`useCallback` needs to be used — to be used as a callback and thus prevent the unnecessary re-renders. Tension: `memo` can't prevent `ExpensiveComponent` from being re-rendered. Outcome: const handleRender = useCallback(() => {...}, []);.

PERTAIN_TOProblem

Is there any performance differences? — Here is an example of 2 buttons with click handlers, one function is created in the component body, the other in the JSX. Outcome: If there is any performance difference, it will be trivial.

PERTAIN_TOSolution

I strongly recommend that you do not try to optimize at this level. — If there is any performance difference, it will be trivial. Tension: save the performance improvements for larger scale things. Outcome: Write your code for readability.

PERTAIN_TOAnswer

PERTAIN_TOProblem

the path list at the end contains nodes with equal G scores — I have an implementation of Astar. Tension: it seems to plot an odd path to the target.

PERTAIN_TOSolution

I created a new hybrid cost value, I call the Bcost — The tutorial that I was trying to follow lead me around in circles. Tension: I gave up on trying to update nodes G value as stated in the tutorials. Outcome: the algorithm way more efficient and as you'll see, it barely ever chooses a node that isnt the best next node.

PERTAIN_TOAnswer

PERTAIN_TOProblem

But it doesn't work like that. — I wanted to try power of virtual threads in Java in a simple application which consists of many tasks. Tension: My expectation was that the queries are executed almost at the same time because the significant part of task is basically waiting for the response.

PERTAIN_TOSolution

adding a pause to your task after connecting — You can also use a 'sleep(delay)' in mysql, to make statements last longer. Tension: to prove your tasks can make parallel statements. Outcome: You'll have time to show processlist by hand now.

PERTAIN_TOSolution

Mysql driver 9.0.0+ (currently 9.1.0) has ReentrantLock(s) now — IF they were not hooked on mysql internal synchronized blocks. Tension: it should have helped. Outcome: and it should work as this enabled the virtual thread to go do something else.

PERTAIN_TOSolution

write a small java method to read the "/proc/thread-self/status" on each task — If you are on linux. Tension: This would prove on which distinct native OS threads your VTs are running. Outcome: the 'Pid' row in particular.

PERTAIN_TOSolution

For Windoze I used JNA: — For Windoze. Tension: This would prove on which distinct native OS threads your VTs are running. Outcome: jna-platform 5.15.0.

PERTAIN_TOAnswer

PERTAIN_TOProblem

my benchmark shows they have similar speed — when used as a counter, but I'm not sure if this is due to bad benchmarking. Tension: since `int` is smaller it should be faster. Outcome: currently my benchmark shows they have similar speed.

PERTAIN_TOSolution

As requested, a better microbenchmark, can run online on https://quick-bench.com/ — demonstrating a half of the test cases in the question. Tension: Other test cases is your homework. Outcome: demonstrating a half of the test cases in the question.

PERTAIN_TOAnswer

PERTAIN_TOProblem

std::string_view becomes invalid after moving a std::string when the string uses SSO

PERTAIN_TOSolution

Skip the SSO detector and switch to compiler-generated functions

PERTAIN_TOSolution

Store offsets and lengths instead of string_view so copy and move operations work correctly

PERTAIN_TOAnswer

PERTAIN_TOProblem

I've tried in my code, and both of them produce the same code (ie., cmov). Tension: I've seen many people talking about how a ternary statement actually produces code that eliminates the branch, whereas the if-else statement is less likely to do so.

PERTAIN_TOSolution

Ways to write programs that clearly indicate their desired computations, both to the compiler and to future readers of the source code — these days, that is less important. Tension: it remains important to give programmers expressive power. Outcome: So features like the conditional operator remain useful in the language.

PERTAIN_TOAnswer

PERTAIN_TOAnswer

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