Which is why you should:
- Preallocate the vector if you can guesstimate the size
- Use a vector library that won’t reallocate the entire vector on every single addition (like Rust, whose
Vec
doubles in size every time it runs out of space)
Comment on Explain yourselves, comp sci.
kbotc@lemmy.world 6 months agoDynamically sized but stored contiguously makes the systems performance engineer in me weep. If the lists get big, the kernel is going to do so much churn.
Which is why you should:
Vec
doubles in size every time it runs out of space)matlab likes to pick the smallest available spot in memory to store a list, so for loops that increase the size of a matrix it’s recommended to preallocate the space using a matrix full of zeros!
Is that churn or chum? (RN or M)
Churm
Killing_Spark@feddit.de 6 months ago
Contiguous storage is very fast in terms of iteration though often offsetting the cost of allocation
Slotos@feddit.nl 6 months ago
Modern CPUs are also extremely efficient at dealing with contiguous data structures. Branch prediction and caching get to shine on them.
Avoiding memory access or helping CPU access it all upfront switches physical domain of computation.