Optimizations
Premature and/or over-optimization is often claimed to be a root of most evil in the programming world. However, what to do when optimization IS necessary?
IT Hares discuss certain not-so-trivial optimization techniques. It doesn’t mean that you should use them at all costs (and most likely, you don’t); however, if you do have a reason to optimize – this information may be handy.
Infographics: Operation Costs in CPU Clock Cycles, Take 2
June 19, 2026 by • “No Bugs” Bunny
Quote
The cost of thread context switch, including cache invalidation, can reach up to 3 million CPU cycles
Another Quote
RTTI can be quite expensive, with
dynamic_cast<>being up to 5x more expensive than a simple virtual function call
Filed under: On.ProgrammingOptimizations
Testing Memory Allocators: ptmalloc2 vs tcmalloc vs hoard vs jemalloc While Trying to Simulate Real-World Loads
July 4, 2018 by • “No Bugs” Bunny
Quote:
if you DO want to get performance from changing mallocs, make sure to test them with your own app
Another Quote:
in our humble opinion, overall winner so far (by a nose) is jemalloc.
Filed under: On.ProgrammingOptimizations
Read moreThe Curse of External Fragmentation: Relocate or Bust!
June 21, 2018 by • “No Bugs” Bunny
Quote:
We won’t ever get (almost) any virtual memory back, plain and simple
Another Quote:
relocation allows not only to reduce fragmentation, but to eliminate it entirely.
Filed under: On.ProgrammingOptimizations
Read more‘Speedy Gonzales’ Serializing (Re)Actors via Allocators
May 1, 2018 by • “No Bugs” Bunny
Quote:
Allocator-based serialization for (Re)Actors is extremely fast (for x64 – around tens of ms per 100MB of state)
Another Quote:
Per-(Re)Actor allocators can be implemented without any changes within (Re)Actor itself (i.e. all the necessary changes can be confined to Infrastructure Code).
Filed under: On.ProgrammingProgramming LanguagesOptimizations
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