Global variables need to be used in the project to store a large amount of data. This project will generally not be stopped, so this part will not be recycled. I have been tracking it for a while now, and I feel that this part of the memory is occupied, which greatly affects subsequent operations.
So I'm wondering if there is one that can be released at every point in time.
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光陰似箭催人老，日月如移越少年。
Depending on the situation, it will be deleted directly at the critical moment.
Del when you are not using it, and then in production, a good way is to use redis storage
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