diff options
Diffstat (limited to 'spec/lib/gitlab/metrics/system_spec.rb')
| -rw-r--r-- | spec/lib/gitlab/metrics/system_spec.rb | 117 |
1 files changed, 107 insertions, 10 deletions
diff --git a/spec/lib/gitlab/metrics/system_spec.rb b/spec/lib/gitlab/metrics/system_spec.rb index a5aa80686fd..abb6a0096d6 100644 --- a/spec/lib/gitlab/metrics/system_spec.rb +++ b/spec/lib/gitlab/metrics/system_spec.rb @@ -3,33 +3,122 @@ require 'spec_helper' describe Gitlab::Metrics::System do - if File.exist?('/proc') - describe '.memory_usage' do - it "returns the process' memory usage in bytes" do - expect(described_class.memory_usage).to be > 0 + context 'when /proc files exist' do + # Fixtures pulled from: + # Linux carbon 5.3.0-7648-generic #41~1586789791~19.10~9593806-Ubuntu SMP Mon Apr 13 17:50:40 UTC x86_64 x86_64 x86_64 GNU/Linux + let(:proc_status) do + # most rows omitted for brevity + <<~SNIP + Name: less + VmHWM: 2468 kB + VmRSS: 2468 kB + RssAnon: 260 kB + SNIP + end + + let(:proc_smaps_rollup) do + # full snapshot + <<~SNIP + Rss: 2564 kB + Pss: 503 kB + Pss_Anon: 312 kB + Pss_File: 191 kB + Pss_Shmem: 0 kB + Shared_Clean: 2100 kB + Shared_Dirty: 0 kB + Private_Clean: 152 kB + Private_Dirty: 312 kB + Referenced: 2564 kB + Anonymous: 312 kB + LazyFree: 0 kB + AnonHugePages: 0 kB + ShmemPmdMapped: 0 kB + Shared_Hugetlb: 0 kB + Private_Hugetlb: 0 kB + Swap: 0 kB + SwapPss: 0 kB + Locked: 0 kB + SNIP + end + + let(:proc_limits) do + # full snapshot + <<~SNIP + Limit Soft Limit Hard Limit Units + Max cpu time unlimited unlimited seconds + Max file size unlimited unlimited bytes + Max data size unlimited unlimited bytes + Max stack size 8388608 unlimited bytes + Max core file size 0 unlimited bytes + Max resident set unlimited unlimited bytes + Max processes 126519 126519 processes + Max open files 1024 1048576 files + Max locked memory 67108864 67108864 bytes + Max address space unlimited unlimited bytes + Max file locks unlimited unlimited locks + Max pending signals 126519 126519 signals + Max msgqueue size 819200 819200 bytes + Max nice priority 0 0 + Max realtime priority 0 0 + Max realtime timeout unlimited unlimited us + SNIP + end + + describe '.memory_usage_rss' do + it "returns the process' resident set size (RSS) in bytes" do + mock_existing_proc_file('/proc/self/status', proc_status) + + expect(described_class.memory_usage_rss).to eq(2527232) end end describe '.file_descriptor_count' do it 'returns the amount of open file descriptors' do - expect(described_class.file_descriptor_count).to be > 0 + expect(Dir).to receive(:glob).and_return(['/some/path', '/some/other/path']) + + expect(described_class.file_descriptor_count).to eq(2) end end describe '.max_open_file_descriptors' do it 'returns the max allowed open file descriptors' do - expect(described_class.max_open_file_descriptors).to be > 0 + mock_existing_proc_file('/proc/self/limits', proc_limits) + + expect(described_class.max_open_file_descriptors).to eq(1024) + end + end + + describe '.memory_usage_uss_pss' do + it "returns the process' unique and porportional set size (USS/PSS) in bytes" do + mock_existing_proc_file('/proc/self/smaps_rollup', proc_smaps_rollup) + + # (Private_Clean (152 kB) + Private_Dirty (312 kB) + Private_Hugetlb (0 kB)) * 1024 + expect(described_class.memory_usage_uss_pss).to eq(uss: 475136, pss: 515072) end end - else - describe '.memory_usage' do - it 'returns 0.0' do - expect(described_class.memory_usage).to eq(0.0) + end + + context 'when /proc files do not exist' do + before do + mock_missing_proc_file + end + + describe '.memory_usage_rss' do + it 'returns 0' do + expect(described_class.memory_usage_rss).to eq(0) + end + end + + describe '.memory_usage_uss_pss' do + it "returns 0 for all components" do + expect(described_class.memory_usage_uss_pss).to eq(uss: 0, pss: 0) end end describe '.file_descriptor_count' do it 'returns 0' do + expect(Dir).to receive(:glob).and_return([]) + expect(described_class.file_descriptor_count).to eq(0) end end @@ -98,4 +187,12 @@ describe Gitlab::Metrics::System do expect(described_class.thread_cpu_duration(start_time)).to be_nil end end + + def mock_existing_proc_file(path, content) + allow(File).to receive(:foreach).with(path) { |_path, &block| content.each_line(&block) } + end + + def mock_missing_proc_file + allow(File).to receive(:foreach).and_raise(Errno::ENOENT) + end end |