Speculo: shared memory made easy
summary
Speculo is a ~2000-line C library that implements lockless IPC on POSIX shared memory with one writer many readers semantics and zero copy commits. It uses compiler memory barriers, chunk allocation with per-chunk states, manifest files to atomically switch to a compacted new shm file, and expiration timestamps to avoid locks during compaction. Setup cost is high but throughput scales well with many parties (sockets win for two). It works as described; adoption so far is experimental.
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chapters (10)
- 0:00Start
- 1:57Motivation and goals
- 4:44Speculo: interlingua for mirror
- 6:19Design principles
- 7:16Useful concepts
- 8:28Step-by-step
- 9:13Writer side
- 19:32Obsoleted data
- 20:48Speculo use cases
- 22:30Question time
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