Merge branch '62722-include-derailed-benchmarks-data-to-ci-report' into 'master'

Run static memory benchmarks from 'derailed_benchmarks' in CI

See merge request gitlab-org/gitlab-ce!29618

.gitlab-ci.yml

@@ -37,6 +37,7 @@ include:
   - local: .gitlab/ci/cng.gitlab-ci.yml
   - local: .gitlab/ci/docs.gitlab-ci.yml
   - local: .gitlab/ci/frontend.gitlab-ci.yml
+  - local: .gitlab/ci/memory.gitlab-ci.yml
   - local: .gitlab/ci/pages.gitlab-ci.yml
   - local: .gitlab/ci/qa.gitlab-ci.yml
   - local: .gitlab/ci/reports.gitlab-ci.yml

.gitlab/ci/memory.gitlab-ci.yml

+memory-static:
+  extends: .dedicated-no-docs-no-db-pull-cache-job
+  script:
+    # Uses two different reports from the 'derailed_benchmars' gem.
+
+    # Loads each of gems in the Gemfile and checks how much memory they consume when they are required.
+    # 'derailed_benchmarks' internally uses 'get_process_mem'
+    - scripts/memory-static 'tmp/memory_static_full_report.txt' 'tmp/memory_static_metrics.txt'
+
+    # Outputs detailed information about objects created while gems are loaded.
+    # 'derailed_benchmarks' internally uses 'memory_profiler'
+    - scripts/memory-static-objects 'tmp/memory_static_objects_full_report.txt' 'tmp/memory_static_metrics.txt'
+  artifacts:
+    paths:
+      - tmp/memory_static_full_report.txt
+      - tmp/memory_static_objects_full_report.txt
+      - tmp/memory_static_metrics.txt
+    reports:
+      metrics: tmp/memory_static_metrics.txt

scripts/memory-static

+#!/usr/bin/env ruby
+
+require_relative '../lib/gitlab/popen'
+
+full_report_filename, metrics_filename = ARGV
+abort 'usage: memory-static <full_report_filename> <metrics_filename>' unless full_report_filename && metrics_filename
+
+full_report, status = Gitlab::Popen.popen(%w(bundle exec derailed bundle:mem))
+abort 'failed to execute the benchmark' unless status.zero?
+
+File.open(full_report_filename, 'w') do |f|
+  f.write(full_report)
+end
+
+stats = /TOP: (?<total_mibs_str>.*) MiB/.match(full_report.lines.first)
+abort 'failed to process the benchmark output' unless stats
+
+File.open(metrics_filename, 'a') do |f|
+  f.puts "memory_static_total_mb #{stats[:total_mibs_str].to_f.round(1)}"
+end

scripts/memory-static-objects

+#!/usr/bin/env ruby
+
+require_relative '../lib/gitlab/popen'
+
+full_report_filename, metrics_filename = ARGV
+abort 'usage: memory-static-objects <full_report_filename> <metrics_filename>' unless full_report_filename && metrics_filename
+
+full_report, status = Gitlab::Popen.popen(%w(bundle exec derailed bundle:objects))
+abort 'failed to execute the benchmark' unless status.zero?
+
+File.open(full_report_filename, 'w') do |f|
+  f.write(full_report)
+end
+
+allocated_str = full_report.lines[1]
+retained_str = full_report.lines[2]
+allocated_stats = /Total allocated: (?<bytes>.*) bytes \((?<objects>.*) objects\)/.match(allocated_str)
+retained_stats = /Total retained: (?<bytes>.*) bytes \((?<objects>.*) objects\)/.match(retained_str)
+
+abort 'failed to process the benchmark output' unless allocated_stats && retained_stats
+
+File.open(metrics_filename, 'a') do |f|
+  f.puts "memory_static_objects_allocated_mb #{(allocated_stats[:bytes].to_f / (1024 * 1024)).round(1)}"
+  f.puts "memory_static_objects_retained_mb #{(retained_stats[:bytes].to_f / (104 * 1024)).round(1)}"
+  f.puts "memory_static_objects_allocated_items #{allocated_stats[:objects]}"
+  f.puts "memory_static_objects_retained_items #{retained_stats[:objects]}"
+end