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.
Allocator for (Re)Actors with Optional Kinda-Safety and Relocation
August 15, 2017 by • “No Bugs” Bunny
Quote:
Safe with relocation’ mode will allow us to eliminate dreaded ‘external fragmentation’ – which tends to cause quite a bit of trouble for long-running systems
Another Quote:
For a long while, I have been a strong proponent of message-passing mechanisms over mutex-based thread sync for concurrency purposes
Filed under: On.System Architecture(Re)ActorsOn.ProgrammingOptimizations
Read moreUltra-fast Serialization of C++ Objects
May 16, 2017 by • “No Bugs” Bunny
Quote:
in both these cases we can be 100% sure that we’ll be deserializing this state on the executable which is identical to the executable which serialized the state.
Another Quote:
Even when comparing with home-grown code with per-field serialization, our Ultra-Fast Serialization still wins (up to 1.5x-2x)
Filed under: On.ProgrammingTips and TricksOptimizations
Read moreSome Big-Os are Bigger Than Others
February 21, 2017 by • “No Bugs” Bunny
Quote:
Strictly speaking, for real-world computers, every algorithm which completes in a finite time can be said to be O(1)
Another Quote:
now the difference because of unfortunate ‘jumps’ over (uncached at the time) memory can lead to a 100x+ (!) performance difference. However, it is still O(1) and is rarely taken into account during performance analysis
Filed under: On.ProgrammingOptimizations
Read moreInfographics: Operation Costs in CPU Clock Cycles
September 12, 2016 by • “No Bugs” Bunny
Quote:
Back in 80s, it was possible to calculate the speed of the program just by looking at assembly.
Another Quote:
keep in mind that these days compilers tend to ignore inline specifications more often than not
Filed under: On.ProgrammingOptimizations
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