mirror of
https://github.com/kuhyx/testsAndMisc.git
synced 2026-11-10 23:07:03 +01:00
Krzysztof kuhy Rudnicki
836f4ef2de
Diagnosing "Steam downloads are slow" kept pointing at the ISP because every averaged measurement showed a steady ~170 Mbps. Sampling at 1s instead of 5s showed that plateau does not exist: the link alternates between ~450 Mbps bursts and multi-second stalls. Effective rate is burst x duty_cycle, and only the second factor was wrong. steam-download-duty.sh reports those two factors separately, which is what the Steam UI cannot do. line-speed-probe.sh separates burst from sustained throughput, because a single stream tops out near 180 Mbps on this line and reads convincingly as ISP shaping when it is not — a many-connection swarm reaches 986 Mbps with zero retransmits. Arithmetic is extracted into pure helpers with main() behind a BASH_SOURCE guard so the bats suite can source them without starting a measurement. install.sh installs bats and links both scripts onto PATH. Note: no CI workflow runs .sh/.bats tests, including the four shell tests that predate this one, so the suite is manual-only for now.
62 lines
1.8 KiB
Bash
Executable File
62 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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# ============================================================================
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# Install dependencies for the network diagnostics scripts and link them onto
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# PATH.
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#
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# Runtime deps : curl, awk, coreutils (all base on Arch — checked, not installed)
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# Test deps : bats (extra/bats) — needed only to run the .bats suite
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#
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# Idempotent: safe to re-run. Existing symlinks are refreshed, already-present
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# packages are skipped by pacman --needed.
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# ============================================================================
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set -euo pipefail
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SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
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readonly SCRIPT_DIR
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readonly BIN_DIR="${HOME}/.local/bin"
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readonly SCRIPTS=(line-speed-probe.sh steam-download-duty.sh)
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require_runtime_tools() {
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# These ship with base/base-devel on Arch. Fail loudly rather than trying to
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# install a broken base system.
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local missing=()
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local tool
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for tool in curl awk; do
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command -v "$tool" >/dev/null 2>&1 || missing+=("$tool")
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done
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if (( ${#missing[@]} > 0 )); then
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printf 'Error: missing required tools: %s\n' "${missing[*]}" >&2
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exit 1
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fi
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}
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install_test_deps() {
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if command -v bats >/dev/null 2>&1; then
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printf 'bats already installed (%s)\n' "$(bats --version)"
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return
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fi
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printf 'Installing bats (test dependency)...\n'
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sudo pacman -S --noconfirm --needed bats
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}
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link_scripts() {
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mkdir -p "$BIN_DIR"
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local s
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for s in "${SCRIPTS[@]}"; do
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ln -sfn "${SCRIPT_DIR}/${s}" "${BIN_DIR}/${s}"
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printf 'linked %s -> %s\n' "${BIN_DIR}/${s}" "${SCRIPT_DIR}/${s}"
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done
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}
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main() {
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require_runtime_tools
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install_test_deps
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link_scripts
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printf '\nDone. Run the tests with:\n'
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printf ' bats %s/../../tests/test_network_diagnostics.bats\n' "$SCRIPT_DIR"
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}
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main "$@"
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