Experiences with Facebook's C++ library
summary
Facebook's open source C++ library folly focuses on practical fixes: a new conversion utility borrows fast float code from V8; dynamic handles JSON parsing/serialization; throw/catch costs measure ~53× slower than return values so exception_wrapper and an exception tracer are used instead. Thread-local tools include a thread-local access-all-threads API for aggregating per-thread counters. Read-mostly shared pointers shard refcounts to avoid contention for single-line refcounts, singletons can be quiesced before fork, LIFO condition wakes cut latency ~1%, and an indexed mempool avoids reclamation but shows 16-bit ABA tagging crashed roughly every six hours.
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chapters (16)
- 0:00Introduction to Folly
- 1:03Purpose and history of Folly
- 2:29Transition to modern C++ standards
- 3:09Optimized containers in Folly
- 4:57Synchronization tools
- 7:42String optimizations
- 9:04Exception handling strategies
- 13:21Bit manipulation utilities
- 16:09Dynamic typing with Dynamic
- 18:34Thread-local storage techniques
- 26:58Singleton patterns
- 33:18Synchronization primitives
- 39:24Condition variable optimizations
- 41:51Futures and executors
- 44:18Indexed memory pool
- 47:07Conclusion and resources
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