Compiling to Webassembly quickly fills up available RAM and crashes computer

[rschulman]

When compiling to wasm on a Dell XPS 13 running Ubuntu 16.10, rustc begins using more and more RAM until the computer begins thrashing and eventually becomes unusable.

rustc version: rustc 1.19.0-nightly (f4209651e 2017-05-05)

Judging by the --verbose output, cargo doesn't even get as far as calling emcc before compilation gets bogged down.

Happy to help debug further.

[brson]

@rschulman does this happen when compiling any code base or a specific code base?

[rschulman]

@brson It has happened on both a bog-simple Hello world (literally just the file that cargo deposits for you) as well as a more complex program with SDL and mouse interaction.

[rschulman]

One other note is that I believe this happens on Linux but not OS X. I'm pretty sure I compiled something to wasm on my work laptop with this same configuration but I will have to check tomorrow when I'm back at work.

[rschulman]

Update: Doing a cargo clean in the Hello World directory and building again was successful. Trying the same in the SDL/mouse program was NOT successful, however. Building there still failed.

[rschulman]

Another update: This does NOT occur on my Macbook Air at my office.

One possibly important note: The build folder is shared across architectures between Mac and Ubuntu.

[eholk]

I ran into a problem building with Emscripten once where the JS optimizer would run out of memory. I wonder if a similar thing is happening here. It's probably not quite, because the JS optimizer had a RAM limit that it was hitting, and the fix was to increase it. You seem to not have a RAM limit at all here.

[Dylan-DPC]

@rschulman sorry for the "someone pinged me on an old issue" moment but are you still having this issue?

[rschulman]

@Dylan-DPC Honestly, I haven't tried since much after I filed this issue, sorry!