Hello friends In my `schema.graphql`, I have 13 queries and 6 mutations. graphql-kotlin takes about ...

# graphql-kotlin

[jmfayard]

Hello friends
In my schema.graphql, I have 13 queries and 6 mutations.
graphql-kotlin takes about 3s to generate the GraphQL object.
I don't mind on server startup, but it makes the unit tests slow.
Is there something I can do to investigate & improve performance?

[Dariusz Kuc]

👋 3s does seem excessive but unfortunately I don't think we ever done benchmarking on how long it takes to create the schema so hard to say whether it is expected or not

[jmfayard]

Thanks for your answer.
If there is a way to improve performance, would that be mostly in graphql-java or in graphql-kotlin?

[Dariusz Kuc]

reflection is pretty slow but still 3s seems pretty excessive if you ask me

[Dariusz Kuc]

how many types your schema defines?

[Dariusz Kuc]

also are you limiting the amount of packages ("supported packages" param) to scan by classgraph?

[jmfayard]

yes I have a number of features and everywhere I use

supportedPackages = listOf("com.tignum.backend.features.$FEATURE$.graphql"),

[jmfayard]

I have about 60 types, including them all: outputs, inputs, enums, union interfaces

[Dariusz Kuc]

thats not many

[Dariusz Kuc]

have you tried running a profiler to see where the time is spent?

[jmfayard]

yes but I have not the least idea on how to interpret it

[Dariusz Kuc]

looks like our spring example app with handful of queries takes ~2s to start on my machine (also includes some overhead from spring)

[jmfayard]

hs_err_pid38426.jfr

[Dariusz Kuc]

It looks like most of the time is spent going through the classpath

[jmfayard]

Could it be that it scans for packages com.tignum.backend.features.$FEATURE$.graphql in all my Gradle dependencies, while it's in fact only present in my own source code?

[Dariusz Kuc]

might be

[Dariusz Kuc]

it is supposed to be very fast -> https://github.com/classgraph/classgraph

[jmfayard]

That does make a difference!
From 700ms to 220m if I only scan my own code.
I have 198 dependencies by the way...