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| 1 | +#!/usr/bin/env bash |
| 2 | +# |
| 3 | +# @license Apache-2.0 |
| 4 | +# |
| 5 | +# Copyright (c) 2018 The Stdlib Authors. |
| 6 | +# |
| 7 | +# Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | +# you may not use this file except in compliance with the License. |
| 9 | +# You may obtain a copy of the License at |
| 10 | +# |
| 11 | +# http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | +# |
| 13 | +# Unless required by applicable law or agreed to in writing, software |
| 14 | +# distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | +# See the License for the specific language governing permissions and |
| 17 | +# limitations under the License. |
| 18 | + |
| 19 | +# Build script to log metrics in order to monitor resource usage over time. |
| 20 | + |
| 21 | +# VARIABLES # |
| 22 | + |
| 23 | +# Define an output file to store metrics: |
| 24 | +log_file="${CIRCLE_ARTIFACTS}/system_metrics.txt" |
| 25 | + |
| 26 | +# Define an interval for logging metrics: |
| 27 | +interval='1s' |
| 28 | + |
| 29 | + |
| 30 | +# FUNCTIONS # |
| 31 | + |
| 32 | +# Defines an error handler. |
| 33 | +on_error() { |
| 34 | + echo 'ERROR: An error was encountered during execution.' >&2 |
| 35 | + exit 1 |
| 36 | +} |
| 37 | + |
| 38 | +# Prints system memory usage. |
| 39 | +# |
| 40 | +# Format: |
| 41 | +# |
| 42 | +# memory_used_in_MB,total_memory_in_MB,percent_used |
| 43 | +# |
| 44 | +memory_usage() { |
| 45 | + local mem=$(free -m | awk 'NR==2 {printf "%sMB,%sMB,%.2f%%)", $3, $2, $3*100/$2}') |
| 46 | + echo "${mem}" |
| 47 | +} |
| 48 | + |
| 49 | +# Prints system disk usage. |
| 50 | +# |
| 51 | +# Format: |
| 52 | +# |
| 53 | +# disk_used_in_GB,total_disk_space_in_GB,percent_used |
| 54 | +# |
| 55 | +disk_usage() { |
| 56 | + local disk=$(df -h | awk '$NF=="/" {printf "%dGB,%dGB,%s", $3, $2, $5}') |
| 57 | + echo "${disk}" |
| 58 | +} |
| 59 | + |
| 60 | +# Prints the system load average. |
| 61 | +load_avg() { |
| 62 | + local load=$(top -bn1 | grep load | awk '{printf "%.2f", $(NF-2)}') |
| 63 | + echo "${load}" |
| 64 | +} |
| 65 | + |
| 66 | +# Polls the system for system metrics. |
| 67 | +# |
| 68 | +# $1 - poll interval |
| 69 | +# $2 - output log file |
| 70 | +poll() { |
| 71 | + local disk |
| 72 | + local mem |
| 73 | + local cpu |
| 74 | + |
| 75 | + # Set headers: |
| 76 | + echo 'mem,total,pct,du,total,pct,load' >> "$2" |
| 77 | + |
| 78 | + # Poll for metrics: |
| 79 | + while true; do |
| 80 | + mem=$(memory_usage); |
| 81 | + disk=$(disk_usage); |
| 82 | + cpu=$(load_avg); |
| 83 | + echo "${mem},${disk},${cpu}" >> "$2"; |
| 84 | + sleep "$1"; |
| 85 | + done |
| 86 | +} |
| 87 | + |
| 88 | +# Main execution sequence. |
| 89 | +main() { |
| 90 | + poll "${interval}" "${log_file}" |
| 91 | +} |
| 92 | + |
| 93 | +# Set an error handler: |
| 94 | +trap 'on_error' ERR |
| 95 | + |
| 96 | +# Run main: |
| 97 | +main |
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