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fix: cap parallel container image pulls #9400

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fix: cap parallel container image pulls #9400

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10 changes: 7 additions & 3 deletions vhdbuilder/packer/install-dependencies.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -815,14 +815,18 @@ string_replace() {
echo ${1//\*/$2}
}

# Limit number of parallel pulls to 2 less than number of processor cores in order to prevent issues with network, CPU, and disk resources
# Account for possibility that number of cores is 3 or less
# Each image fetch can open several layer downloads. Cap the worker count so high-vCPU
# builders do not overload the registry or network connection.
max_parallel_container_image_pulls=16
num_proc=$(nproc)
if [ "$num_proc" -gt 3 ]; then
parallel_container_image_pull_limit=$(nproc --ignore=2)
parallel_container_image_pull_limit=$((num_proc - 2))
else
parallel_container_image_pull_limit=1
fi
if [ "$parallel_container_image_pull_limit" -gt "$max_parallel_container_image_pulls" ]; then
parallel_container_image_pull_limit="$max_parallel_container_image_pulls"
fi
echo "Limit for parallel container image pulls set to $parallel_container_image_pull_limit"

declare -a image_pids=()
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