Hi all. We are experimenting by building a `kmp-co...

# multiplatform

[Chiaradia Juan]

Hi all.
We are experimenting by building a kmp-compose-lib that will provide common compose-ui and other features to an iOS and android app.

We split the umbrella library in multiple modules, for example, one module for our design-system and another for our home-tab .

umbrella-project
-- kmp-lib
-- compose-ui
---- design-system
---- home-tab-root

and where kmp-lib relevant gradle script parts looks like:

val xcf = XCFramework("KmpLib")
    val iosTargets = listOf(iosArm64(), iosSimulatorArm64())

    iosTargets.forEach { iosTarget ->
        iosTarget.binaries.framework {
            baseName = "KmpLib"
            isStatic = true
            export(projects.composeUi.homeTabRoot)
            export(projects.composeUi.designSystem)
            xcf.add(this)
        }
    }

The problem we are facing is that when creating the XCFramework the assemble task takes forever until eventually it throws a heap OOM.
We are running on macos, 32 gb, and are assigning 8G to the heap and daemon.

Has anyone faced a similar issue?

Compilation failed: Java heap space

 * Source files: 
 * Compiler version: 2.2.0
 * Output kind: FRAMEWORK

[Andres Schmois]

XCFramework is definitely the slowest part of the KMP workflow for me. How big are your projects? Have you increased the heap space for gradle?

[Chiaradia Juan]

It is not big enough 😄 a couple of thousands lines of code max, as we are starting the experiment and starting to port some parts of the app, ui and business logic.
I had 8G on the heap, and tried with 16G ... but I have an M1 32Gb ... so I am limited that way

[Chiaradia Juan]

In case it helps ...

As part of our design-system, we had a set of 3k icon files defined as lazy ImageVector...removing that, makes it compile on time again ... still, I would expect kmp to handle 3k files with no issues 🥲, now the project has exactly 105 files ... and it takes 4 minutes to compile ... that is something unaffordable I think.

105 files, in 5 modules (one module is the umbrella, 4 modules have the actual logic)

kmp-lib (umbrella - compose)
design-system (compose)
navigation (compose)
ui (compose)
domain

and with no big dependencies other than compose (we also have ktor)

[Timofey Solonin]

Hey, can you please report the OOM as a bug to YouTrack? If you can share the reproducer that will be most helpful, otherwise recording the JFR for OOM will help pinpoint the source of breakage:

-Dorg.gradle.jvmargs="-Xmx8g ... other jvmargs ... XX:+FlightRecorder -XX:FlightRecorderOptions=stackdepth=256 -XX:StartFlightRecording,settings=profile,filename=/path/to/oom.jfr"

You can also make sure you have linkage caching enabled and build debug binaries for development to speed up build.