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by cies
3113 days ago
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> Latency is additive; it's a sum() operation, not a max() operation. This! And you can only discard some components latency when it disappears in the deviation of another components much larger latency. In most PHP (or Ruby/Python/etc for that matter), this is not the case. They add some 10-150ms on top, and often the db calls are <10ms. Performance does matter, and is hard to improve once you have many KLOC of code in a slow language. Hence FB spend big bucks on PHP performance improvements. |
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Most are <10ms. Those nasty few ones with 100+ms (or sometimes 10+s!) are where the best money is spent optimizing. However good query/db schema optimization is a skill many developers do not possess... which is why a good DBA is worth his weight in gold.