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Set --quota-backend-bytes when launching etcd in tests.

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By default, etcd makes a huge 10 GB mmap() allocation when it starts up.
It doesn't actually use that much memory, it's just address space, but
it caused me grief when I tried to use 'rr' to debug a python test run.
Apparently, when you replay the 'rr' trace, it does allocate memory for
all that address space.

The size of the initial mmap depends on the --quota-backend-bytes setting.
Our etcd clusters are very small, so let's set --quota-backend-bytes to
keep the virtual memory size small, to make debugging with 'rr' easier.

See https://github.com/etcd-io/etcd/issues/7910 and
5e4b008106
This commit is contained in:
Heikki Linnakangas
2022-05-25 16:57:45 +03:00
parent 9ab52e2186
commit 24d2313d0b
2 changed files with 9 additions and 1 deletions
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6
test_runner/fixtures/zenith_fixtures.py
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@@ -1893,7 +1893,11 @@ class Etcd:
f"--data-dir={self.datadir}",
f"--listen-client-urls={client_url}",
f"--advertise-client-urls={client_url}",
f"--listen-peer-urls=http://127.0.0.1:{self.peer_port}"
f"--listen-peer-urls=http://127.0.0.1:{self.peer_port}",
# Set --quota-backend-bytes to keep the etcd virtual memory
# size smaller. Our test etcd clusters are very small.
# See https://github.com/etcd-io/etcd/issues/7910
f"--quota-backend-bytes=100000000"
]
self.handle = subprocess.Popen(args, stdout=log_file, stderr=log_file)