97 lines
3 KiB
Ruby
97 lines
3 KiB
Ruby
require 'spec_helper'
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describe Gitlab::Metrics::Samplers::RubySampler do
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let(:sampler) { described_class.new(5) }
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let(:null_metric) { double('null_metric', set: nil, observe: nil) }
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before do
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allow(Gitlab::Metrics::NullMetric).to receive(:instance).and_return(null_metric)
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end
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describe '#initialize' do
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it 'sets process_start_time_seconds' do
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Timecop.freeze do
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expect(sampler.metrics[:process_start_time_seconds].get).to eq(Time.now.to_i)
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end
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end
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end
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describe '#sample' do
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it 'samples various statistics' do
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expect(Gitlab::Metrics::System).to receive(:cpu_time)
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expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
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expect(Gitlab::Metrics::System).to receive(:memory_usage)
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expect(Gitlab::Metrics::System).to receive(:max_open_file_descriptors)
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expect(sampler).to receive(:sample_gc)
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sampler.sample
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end
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it 'adds a metric containing the process resident memory bytes' do
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expect(Gitlab::Metrics::System).to receive(:memory_usage).and_return(9000)
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expect(sampler.metrics[:process_resident_memory_bytes]).to receive(:set).with({}, 9000)
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sampler.sample
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end
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it 'adds a metric containing the amount of open file descriptors' do
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expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
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.and_return(4)
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expect(sampler.metrics[:file_descriptors]).to receive(:set).with({}, 4)
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sampler.sample
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end
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it 'adds a metric containing the process total cpu time' do
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expect(Gitlab::Metrics::System).to receive(:cpu_time).and_return(0.51)
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expect(sampler.metrics[:process_cpu_seconds_total]).to receive(:set).with({}, 0.51)
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sampler.sample
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end
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it 'adds a metric containing the process max file descriptors' do
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expect(Gitlab::Metrics::System).to receive(:max_open_file_descriptors).and_return(1024)
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expect(sampler.metrics[:process_max_fds]).to receive(:set).with({}, 1024)
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sampler.sample
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end
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it 'clears any GC profiles' do
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expect(GC::Profiler).to receive(:clear).at_least(:once)
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sampler.sample
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end
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end
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describe '#sample_gc' do
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let!(:sampler) { described_class.new(5) }
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let(:gc_reports) { [{ GC_TIME: 0.1 }, { GC_TIME: 0.2 }, { GC_TIME: 0.3 }] }
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it 're-enables GC::Profiler if needed' do
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expect(GC::Profiler).to receive(:enable)
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sampler.sample
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end
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it 'observes GC cycles time' do
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expect(sampler).to receive(:sample_gc_reports).and_return(gc_reports)
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expect(sampler.metrics[:gc_duration_seconds]).to receive(:observe).with({}, 0.1).ordered
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expect(sampler.metrics[:gc_duration_seconds]).to receive(:observe).with({}, 0.2).ordered
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expect(sampler.metrics[:gc_duration_seconds]).to receive(:observe).with({}, 0.3).ordered
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sampler.sample
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end
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it 'adds a metric containing garbage collection statistics' do
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GC.stat.keys.each do |key|
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expect(sampler.metrics[key]).to receive(:set).with({}, anything)
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end
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sampler.sample
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end
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end
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end
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