Expert · Module 13 · Lesson 1 of 6
Why Allocation Dominates: Measuring new and vector
Measure new and delete against vector growth, see where doubling copies and heap calls dominate runtime, and learn when allocation deserves replacement.
By the end you can
- Measure per-operation cost of new and delete with a timed loop
- Explain vector doubling and why reallocation copies dominate runtime
- Identify allocation hot spots with counts before replacing code
01 · A question first
You profile a parser that pushes one million nodes into a vector of pointers, each node from new. The profiler attributes 70 percent of time to allocation and page mapping, not parsing. Which part is the heap call, which part is growth copying, and how do you separate them with numbers you can repeat?
Make a guess before you read on.
02 · The idea
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What's inside
- Start with the problem
- How the idea works
- A library desk
- Why it is correct
- What it costs
- Pitfalls and variations
- Where it is used
03 · Practice
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