延迟医生

LATENCY DOCTOR

Available since:

2.8.13

Time complexity:

O(1)

ACL categories:

@admin, @slow, @dangerous,

LATENCY DOCTOR 命令报告与延迟相关的不同问题，并提供可能的解决方案建议。

此命令是延迟监控框架中最强大的分析工具，能够提供额外的统计数据，如延迟峰值之间的平均周期、中位数偏差以及事件的可读性分析。对于某些事件，如fork，还提供了额外信息，如系统分叉进程的速率。

这是你应该在Redis邮件列表中发布的输出，如果你正在寻求关于延迟相关问题的帮助。

示例

127.0.0.1:6379> latency doctor

Dave, I have observed latency spikes in this Redis instance.
You don't mind talking about it, do you Dave?

1. command: 5 latency spikes (average 300ms, mean deviation 120ms,
    period 73.40 sec). Worst all time event 500ms.

I have a few advices for you:

- Your current Slow Log configuration only logs events that are
    slower than your configured latency monitor threshold. Please
    use 'CONFIG SET slowlog-log-slower-than 1000'.
- Check your Slow Log to understand what are the commands you are
    running which are too slow to execute. Please check
    http://redis.io/commands/slowlog for more information.
- Deleting, expiring or evicting (because of maxmemory policy)
    large objects is a blocking operation. If you have very large
    objects that are often deleted, expired, or evicted, try to
    fragment those objects into multiple smaller objects.

注意：医生有异常的心理行为，因此我们建议与其互动时要小心。

更多信息请参考延迟监控框架页面。

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