Node-RED-docker causes regular CPU spikes

首先，使用全新的 nodered/node-red:latest (2.1.3) 容器重现该问题，并按照报告中的说明使用 docker stats 对其进行监控。比较存在和不存在活动流及第三方库时的行为；完成的标准是确定反复出现的 30-minute CPU spike 的原因，并确认该现象不再发生。

I have recently noticed that a closely monitored docker container using image nodered/node-red:latest (2.1.3) shows, on the processor core (or thread ?) it uses, CPU spikes up to 100% every 30 minutes. My monitoring happens by polling docker stats regularly and graphing it over time. This also occurs if the container is fresh, i.e. with no active flows, no third-party libraries installed, no custom code, etc.

A fuller writeup, with many helpful comments from community members, is available on the Node-RED Forum. When reading through it, bear in mind that the suspicion that Node-RED crashed my system was false.

A quick summary of the salient findings:

• other Node.js containers on my system do not show these spikes.
• manually inserted GC calls do not mitigate the issue, making it unlikely to be related to Node.js GC
• other users can reproduce spikes, whether they're on Docker or not

Given the replies and confirmations that the issue was reproducible, I believe that my environment is irrelevant, but here goes: I am running on a system with an Intel Celeron N3350 processor with 4GB of memory. The OS is Ubuntu 20.04 LTS and I am running Docker version 19.03.8, build afacb8b7f0.