Unverified50% confidenceFactExact time
p99 (99th percentile latency) means that 99% of all requests have a response time below a certain value.
1
Sources
50%
Confidence
Long-term
Relevance
9/9/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedJeff Dean pointed out in 'The Tail at Scale' that if a single request calls 100 backend services in parallel and each service has a P99 latency of 10ms, the probability of the entire request completing within 10ms is only about 36.6%.68% similarUnverified业界通常用P50（中位数延迟）和P99（99%请求延迟上限）等分位数指标衡量真实服务质量，而非仅看峰值数字67% similarUnverifiedIn financial statements, character accuracy may be as high as 99%, but semantic accuracy may be less than 50%.61% similarUnverified即便单字符识别准确率达到99%，对于一个包含10个字符的字段，其整体正确率也仅约90%，这被称为"准确率衰减效应"61% similar
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