High CPU usage

[schickling]

This issue pertains to:

• GraphQL Playground - Electron App
• GraphQL Playground
• GraphQL Playground Middleware

What OS and OS version are you experiencing the issue(s) on?

MacOS High Sierra

What version of graphql-playground(-electron/-middleware) are you experience the issue(s) on?

v1.3.6 (web)

What is the expected behavior?

The Playground should be friendly to my CPU 🤔

What is the actual behavior?

In some scenarios the CPU goes all crazy (sometimes above 80%). I couldn't exactly pin it down to a specific reproducible case but it's happening quite frequently. I suspect the Playground is "trapped" in some kind of infinite loop.

What steps may we take to reproduce the behavior?

Unfortunately I couldn't yet find a clear way to reproduce it. Would be great if other people can add more information!

Update:

I suspect it has something to do with errors (for example when the server returns an error)

[vincenzo]

I confirm this issue.

[marktani]

To me this happened when I was running a query that was returning a lot of data.

Can everyone share some information when it happened to them? 🙂 This might help pinning down the problem.

[marktani]

This is one potential cause: #356.

[schickling]

@marktani the high CPU only occurs with the HTTP middleware. #356 seems to be related to the Electron app

[vincenzo]

@schickling It happens for me (express middleware).

[huv1k]

Can everybody share at least little bit info how to get to this state, because i tried to reproduce it and no luck.

[marktani]

So far I have not been able to reliably reproduce this. Some potential causes

• many Playgrounds are open (many browser tabs)
• many Playground tabs are open
• working with big schemas
• working with big data
• when queries run into an error

[vincenzo]

The times I’ve seen it happening I had one or two (max) playgrounds open; I had a few tabs open; some queries may have errored a few times before getting it right. Small schema.

[kambing86]

having this issue as well in v1.4.3 Mac version,

at the workplace selection screen, the GraphQL Playground helper is constantly at >20% cpu usage
after opening the workplace, cpu usage raised to ~60%
after opening schema, my 2015 Macbook Pro started spinning up the fan, cpu usage raised to ~100%

don't blame on electron, I'm using a lot of electron apps like VSCode and GitKraken, all work just fine
I highly suspect that someone sneaked in some codes to do mining