What the heck is gevent?
summary
Gevent is a coroutine-based concurrency layer that uses greenlets and runtime monkey patching to make blocking libraries yield, letting Python microservices increase throughput (Lyft measures ~12x in benchmarks) but creating hidden correctness and scheduling risks. Specific failures: bike/scooter offers flicker because a pricing endpoint hits a 500 ms per-mode deadline and 0.5% of requests drop; isolating the endpoint to dedicated hosts raises reliability from ~2.5 nines to ~4.5 nines. Beware mixing CPU work and I/O — p99s can triple as greenlet count rises.
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chapters (8)
- 0:00Intro
- 1:21What is gevent
- 4:40Core routines
- 6:21Cooperative multitasking
- 7:23Monkey patching
- 8:08Cooperative routines
- 8:50Code examples
- 16:51Performance
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