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Limit the memory of a dockerized test job #317

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Merged
sjoelund merged 1 commit into from
Aug 17, 2026
Merged

Limit the memory of a dockerized test job #317

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20 changes: 20 additions & 0 deletions .CI/Jenkinsfile
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Original file line number Diff line number Diff line change
Expand Up @@ -598,6 +598,18 @@ done
"""
}

/**
* `docker run` flags capping the container's cgroup at 90% of the node's RAM. test.py limits one
* test at a time, not the sum of the parallel ones. --memory-swap has to repeat the limit; docker
* reads 0 as "unset" and then allows swapping.
*/
def memoryLimitArgs() {
def mb = sh(script: '''awk '/^MemTotal:/ { print int($2 / 1024 * 0.85) }' /proc/meminfo''',
returnStdout: true).trim()
echo "Test container memory limit: ${mb} MB, no swap"
return "--memory=${mb}m --memory-swap=${mb}m"
}

/**
* Runs `body` with the environment of the shared Rust compile cache of the OpenModelica job
* (OpenModelica/.CI/sccache/), which builds the same commits first. Hitting its keys needs the
Expand Down Expand Up @@ -713,10 +725,17 @@ def runRegressiontest(branch, name, extraFlags, omsHash, omcompiler, extrasimfla
// build, the libraries (HOME during the test) and the ssh key; test.py writes a hash next to
// every reference file. rust-cargo-registry is the volume the OpenModelica job uses.
def dockerArgs = "--init" +
(image ? " ${memoryLimitArgs()}" : '') +
" -v /etc/passwd:/etc/passwd:ro -v /etc/group:/etc/group:ro" +
" -v ${env.HOME}:${env.HOME}" +
" -v /mnt/ReferenceFiles:/mnt/ReferenceFiles" +
" --mount type=volume,source=rust-cargo-registry,target=/opt/rust/cargo/registry"
// Only in a container is the cgroup this job's own; a breach kills the greediest omc, which need
// not be the model that caused it.
def cgroupReport = image ? """
cat /sys/fs/cgroup/memory.max || true
trap 'cat /sys/fs/cgroup/memory.peak /sys/fs/cgroup/memory.events || true' EXIT
""" : ''
// Jenkins exports the node's environment into the container, hiding the image's.
def dockerEnv = ['PATH+VENV=/opt/libtest-venv/bin',
'PATH+CARGO=/opt/rust/cargo/bin',
Expand Down Expand Up @@ -956,6 +975,7 @@ def runRegressiontest(branch, name, extraFlags, omsHash, omcompiler, extrasimfla
# too bad if we cannot do it, just continue
ln -s -t \${HOME} \${PREVIOUSHOME}/.local .local || true

${cgroupReport}
cd OpenModelicaLibraryTesting
# Force /usr/bin/omc as being used for generating the mos-files. Ensures consistent behavior among all tested OMC versions
stdbuf -oL -eL time ./test.py --ompython_omhome=/usr ${FMI_TESTING_FLAG} --extraflags='${extraFlags}' --extrasimflags='${extrasimflags}' ${testFlags} --branch="${name}" --output="libraries.openmodelica.org:/var/www/libraries.openmodelica.org/branches/${name}/" --libraries='${libraryPath}/.openmodelica/libraries/' --jobs=${jobs} ${libs_config_file} ${params.OLDLIBS ? "configs/conf-old.json configs/conf-nonstandard.json" : ""} || (killall omc ; false) || exit 1
Expand Down
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