For a while now we've had errors along the line of
```
FATAL: could not create shared memory segment: No space left on device
DETAIL: Failed system call was shmget(key=5432001, size=56, 03600).
HINT: This error does *not* mean that you have run out of disk space.
It occurs either if all available shared memory IDs have been taken, in
which case you need to raise the SHMMNI parameter in your kernel, or
because the system's overall limit for shared memory has been reached.
The PostgreSQL documentation contains more information about
shared memory configuration.
child process exited with exit code 1
```
on macOS CI nodes, which we were not able to reproduce locally. Today I
managed to, sort of by accident, and that allowed me to dig a bit
further.
The root cause seems to be that PostgreSQL, as run by Bazel, does not
always seem to properly unlink the shared memory segment it uses to
communicate with itself. On my machine, running:
```
bazel test -t- --runs_per_test=100 //ledger/sandbox:conformance-test-wall-clock-postgresql
```
and eyealling the results of
```
watch ipcs -mcopt
```
I would say about one in three runs leaks its memory segment. After much
googling and some head scratching trying to figure out the C APIs for
managing shared memory segments on macOS, I kind of stumbled on a
reference to `pcirm` in a comment to some low-ranking StackOverflow
answer. It looks like it's working very well on my machine, even if I
run it while a test (and therefore an instance of pg) is running. I
believe this is because the command does not actually remove the shared
memory segments, but simply marks them for removal once the last process
stops using it. (At least that's what the manpage describes.)
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Currently the message to Slack is always triggered by running the daily
checks. This means that it gets very noisy to:
1. Run the check on PRs affecting the check (like this one),
2. Rerun the check multiple times to ascertain that a given failure is
flaky.
With this PR, the message to Slack is replaced with a simple `echo` when
these checks are not run from the `master` branch, so whoever (manually)
triggered them can still get feedback on the result, but other people
don't get spurious `@here` mentions.
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* Include puppeteer tests in compat tests
This PR adds the puppeteer based tests to the compatibility
tests. This also means that they are now actually compatibility
tests. Before, we only tested the SDK side.
Apart from process management being a nightmare on Windows as usually,
there are two things that might stick out here:
1. I’ve replaced the `sh_binary` wrapper by a `cc_binary`. There is a
lengthy comment explaining why. I think at the moment, we could
actually get rid of the wraper completely and add JAVA to path in
the tests that need it but at least for now, I’d like to keep it
until we are sure that we don’t need to add more to it (and then
it’s also in the git history if we do need to resurrect it).
2. These tests are duplicated now similar to the `daml ledger *`
tests. The reasoning here is different. They depend on the SDK
tarball either way so performance wise there is no reason to keep
them. However, we reference the other file in the docs which means
we cannot change it freely. What we could do is to make this
sufficiently flexible to handle both the `daml start` case and
separate `daml sandbox`/`daml json-api` processes and then we can
reference it in the docs. There is still added complexity for
Windows but that’s necessary for users as well that want to run
this on Windows so that seems unavoidable. (I should probably also
remove my snarky comments 😇) I’d like to kee it duplicated
for this PR and then we can clean it up afterwards.
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* Bump timeouts
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This is the first part of #5700
It adds tests that build create-daml-app using `daml build` and then
run the codegen and build the UI. Contrary to our main tests these
also run on Windows. This is actually reasonably simple by first
building the typescript libraries on Linux and then downloading them
on Windows.
There are two parts that are still missing from the tests in the main
workspace:
1. Building the extra feature. This should be fairly easy to add.
2. Running the pupeeter tests. At least MacOS and Linux should be
reasonably easy. I don’t know what horrors Windows will throw at
us. This step is what actually makes this a compatibility
test. Currently it doesn’t actually launch Sandbox and the JSON API.
Since this PR is already pretty large, I’d like to tackle those things
separately.
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This is temporary. It looks like the macOS nodes are dead; @nycnewman is
looking into it, but in case he doesn't fix it in time, at least we
have a backup plan so we're not completely blocked on Monday.
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add default machine capability
We semi-regularly need to do work that has the potential to disrupt a
machine's local cache, rendering it broken for other streams of work.
This can include upgrading nix, upgrading Bazel, debugging caching
issues, or anything related to Windows.
Right now we do not have any good solution for these situations. We can
either not do those streams of work, or we can proceed with them and
just accept that all other builds may get affected depending on which
machine they get assigned to. Debugging broken nodes is particularly
tricky as we do not have any way to force a build to run on a given
node.
This PR aims at providing a better alternative by (ab)using an Azure
Pipelines feature called
[capabilities](https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/agents?view=azure-devops&tabs=browser#capabilities).
The idea behind capabilities is that you assign a set of tags to a
machine, and then a job can express its
[demands](https://docs.microsoft.com/en-us/azure/devops/pipelines/process/demands?view=azure-devops&tabs=yaml),
i.e. specify a set of tags machines need to have in order to run it.
Support for this is fairly badly documented. We can gather from the
documentation that a job can specify two things about a capability
(through its `demands`): that a given tag exists, and that a given tag
has an exact specified value. In particular, a job cannot specify that a
capability should _not_ be present, meaning we cannot rely on, say,
adding a "broken" tag to broken machines.
Documentation on how to set capabilities for an agent is basically
nonexistent, but [looking at the
code](https://github.com/microsoft/azure-pipelines-agent/blob/master/src/Microsoft.VisualStudio.Services.Agent/Capabilities/UserCapabilitiesProvider.cs)
indicates that they can be set by using a simple `key=value`-formatted
text file, provided we can find the right place to put this file.
This PR adds this file to our Linux, macOS and Windows node init scripts
to define an `assignment` capability and adds a demand for a `default`
value on each job. From then on, when we hit a case where we want a PR
to run on a specific node, and to prevent other PRs from running on that
node, we can manually override the capability from the Azure UI and
update the demand in the relevant YAML file in the PR.
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This PR separates the "last known valid perf test" commit from the
"baseline speedy implementation" commit. It is important for the perf
test to be meaningful that the changes between those two commits are
benign, say minor API adjustments, so that the perf measurement remains
meaningful.
This also adds a check on merging to master that tells Slack if the perf
test has changed and the `test_sha` file needs updating. The Slack
message is conditional on the current commit to avoid excessive noise.
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This PR adds a simple daily job that runs the performance test on a
chosen "baseline" commit and then runs the same benchmark on latest
master. This should allow us to track overall performance improvements.
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* Make compat tests work on windows
This required some changes to the daml_sdk rule since the read-only
installation by the assistant breaks Bazel completely. We could only
apply those changes on Windows but I think I prefer the consistency
across platforms here over trying to stay close to how the SDK is
installed on user machines given that the SDK installation is not
something we’ve had issues with.
I’ve excluded the postgresql tests for now. I don’t expect them to be
particularly hard to fix but I’ve already spent almost 2 days on this
and having some tests run on Windows seems like a clear improvement
over running no tests on Windows :)
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* Remove todo
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I believe the compatibility check is important enough, and should fail
rarely enough, that it is worth reporting even on success. This will
mean (once we support Windows) 3 messages a day, sent while presumably
nobody is working, so the disruption should be minimal.
The issue with reporting only on failures is that, if we don't
proactively check (which we do for the state of master for different
reasons, but would likely not keep doing for a job that doesn't block
PRs), we may get into a state where it is so broken that it doesn't even
report.
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This PR extends the existing Linux compatibility tests to run on macOS
too. Fixes#5692.
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Co-authored-by: Moritz Kiefer <moritz.kiefer@purelyfunctional.org>
For some reason the Azure Pipelines folks thought it was a good idea to
search for templates starting with the current YAML file's path. Other
steps (e.g. the bash script here) start from the root of the repo,
though.
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This is a first step towards testing cross-version
compatibility. It doesn’t actuall do much yet but hopefully it should
be easier to parallelize once we have the initial boilerplate in place
so ideally I’d like to address most missing things and issues in
separate PRs.
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This is meant to be filled once we have a better idea of what exactly we
want to test. See #5665 for current thinking about it.
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