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Contents
describe Appsignal::GarbageCollectionProfiler do
let(:internal_profiler) { FakeGCProfiler.new }
let(:profiler) { described_class.new }
before do
allow_any_instance_of(described_class)
.to receive(:internal_profiler)
.and_return(internal_profiler)
end
context "on initialization" do
it "has a total time of 0" do
expect(profiler.total_time).to eq(0)
end
end
context "when the GC has run" do
before { internal_profiler.total_time = 0.12345 }
it "fetches the total time from Ruby's GC::Profiler" do
expect(profiler.total_time).to eq(123)
end
it "clears Ruby's GC::Profiler afterward" do
expect(internal_profiler).to receive(:clear)
profiler.total_time
end
end
context "when the total GC time becomes too high" do
it "resets the total time" do
internal_profiler.total_time = 2_147_483_647
expect(profiler.total_time).to eq(0)
end
end
context "when the GC has run multiple times" do
it "adds all times from Ruby's GC::Profiler together" do
2.times do
internal_profiler.total_time = 0.12345
profiler.total_time
end
expect(profiler.total_time).to eq(246)
end
end
context "when in multiple threads and with a slow GC::Profiler" do
it "does not count garbage collection times twice" do
threads = []
results = []
internal_profiler.clear_delay = 0.001
internal_profiler.total_time = 0.12345
2.times do
threads << Thread.new do
profiler = Appsignal::GarbageCollectionProfiler.new
results << profiler.total_time
end
end
threads.each(&:join)
expect(results).to eq([123, 0])
end
end
end
Version data entries
60 entries across 60 versions & 1 rubygems