Stream: wasmtime

Topic: cc link error


view this post on Zulip Andrew Brown (Mar 14 2020 at 02:54):

I've been seeing some weird CI failures (https://github.com/bytecodealliance/wasmtime/pull/1263, https://github.com/bytecodealliance/wasmtime/pull/1318, https://github.com/bytecodealliance/wasmtime/pull/1319); @Andy Wortman has a theory that it may disk space related. The error is error: linking with 'cc'. Can anyone with Azure permissions investigate?

This adds support for f32x4.convert_i32x4_s for x86. This conversion is a simple 1:1 lowering; other conversions will not be (see WebAssembly/simd#190).
Until #1306 is resolved (some spilling/regalloc issue with larger FPR register banks), this removes FPR32 support. Only Wasm's i64x2.mul was using this register class and that instruction is pr...
This is fixing up some unfinished parts of the bitcasting approach discussed in #1147. The commit messages have more details (many more details) but the bottom line is that without a new type repre...

view this post on Zulip Andrew Brown (Mar 14 2020 at 02:55):

Here's an example: https://github.com/bytecodealliance/wasmtime/pull/1319/checks?check_run_id=506868460#step:16:43

This is fixing up some unfinished parts of the bitcasting approach discussed in #1147. The commit messages have more details (many more details) but the bottom line is that without a new type repre...

view this post on Zulip Andrew Brown (Mar 16 2020 at 16:58):

@Alex Crichton, your name came up in the Cranelift meeting on this issue; @fitzgen (he/him) thought you might have insight into this. Also, @Andy Wortman has a separate issue that might also be demonstrating the same behavior

view this post on Zulip Alex Crichton (Mar 16 2020 at 18:25):

unfortunately I don't really know what's goign on with CI

view this post on Zulip Alex Crichton (Mar 16 2020 at 18:25):

my best guess is we should roll back nightlies (e.g. use like nightly-YYYY-MM-DD) until one works

view this post on Zulip Alex Crichton (Mar 16 2020 at 18:27):

I can investigate more tmw when I'm back at work

view this post on Zulip iximeow (Mar 16 2020 at 20:08):

as a datapoint: building and running wasmtime tests by the github actions actions results in ~17gb of Stuff after running all the steps listed in a nightly build. measured in a fresh clone of the repo, so that's not with any pre-existing target content.

i notice there are a few steps that are _only_ run for nightly tests, so if it is in fact a disk space issue that might explain why it's only seen on nightly test runs

view this post on Zulip iximeow (Mar 16 2020 at 22:25):

datapoint 2: building with non-nightly steps results in a build that rounds up to 16gb but is in fact 15.63gb! so we at least cross the 16gb threshold on nightly vs nonnightly

view this post on Zulip Alex Crichton (Mar 17 2020 at 14:40):

I'm going to try to continue investigating this error today and see if I can get to the bottom of it

view this post on Zulip Alex Crichton (Mar 17 2020 at 15:29):

ok bisecting a bunch of nightlies at https://github.com/alexcrichton/wasmtime/actions/runs/57523147 and https://github.com/alexcrichton/wasmtime/actions/runs/57538657 shows this is pretty unlikely to be a regression

Standalone JIT-style runtime for WebAsssembly, using Cranelift - alexcrichton/wasmtime
Standalone JIT-style runtime for WebAsssembly, using Cranelift - alexcrichton/wasmtime

view this post on Zulip Alex Crichton (Mar 17 2020 at 15:29):

testing the last good commit -- https://github.com/alexcrichton/wasmtime/runs/514044968?check_suite_focus=true on todays' nightly however shows that this is still failing

Standalone JIT-style runtime for WebAsssembly, using Cranelift - alexcrichton/wasmtime

view this post on Zulip Alex Crichton (Mar 17 2020 at 15:29):

gonna try some disk space savings next

view this post on Zulip Alex Crichton (Mar 17 2020 at 16:33):

ok looks like disk space was the issue -- https://github.com/bytecodealliance/wasmtime/pull/1341, I'll continue to send a few PRs to save disk space on CI so we buy ourselves lots of time before hitting this again

This should save us about 3GB of target directory disk space and it may also be a tiny speed boost. There's no real benefit to using incremental builds on CI because we're not changing code...

view this post on Zulip Alex Crichton (Mar 17 2020 at 16:33):

I'm sad the linker didn't print anything more useful, I thought it actually printed out if it ran out of disk space...

view this post on Zulip Alex Crichton (Mar 17 2020 at 16:35):

that PR saved about 3GB, and https://github.com/bytecodealliance/wasmtime/pull/1343 should save another 7 or so

... but turn it back on in CI by default. The binaryen-sys crate builds binaryen from source, which is a drag on CI for a few reasons: This is quite large and takes a good deal of time to build Th...

view this post on Zulip Alex Crichton (Mar 17 2020 at 16:35):

er, 4*


Last updated: Dec 23 2024 at 13:07 UTC