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|
require_relative 'thread_pool_shared'
module Concurrent
RSpec.describe CachedThreadPool do
subject do
described_class.new(fallback_policy: :discard)
end
after(:each) do
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it_should_behave_like :thread_pool
let(:latch) { Concurrent::CountDownLatch.new }
context '#initialize' do
subject { described_class.new }
it 'sets :max_length to DEFAULT_MAX_POOL_SIZE' do
expect(subject.max_length).to eq described_class::DEFAULT_MAX_POOL_SIZE
end
it 'sets :min_length to DEFAULT_MIN_POOL_SIZE' do
expect(subject.min_length).to eq described_class::DEFAULT_MIN_POOL_SIZE
end
it 'sets :idletime to DEFAULT_THREAD_IDLETIMEOUT' do
expect(subject.idletime).to eq described_class::DEFAULT_THREAD_IDLETIMEOUT
end
it 'sets :max_queue to DEFAULT_MAX_QUEUE_SIZE' do
expect(subject.max_queue).to eq described_class::DEFAULT_MAX_QUEUE_SIZE
end
end
context '#min_length' do
it 'returns zero on creation' do
expect(subject.min_length).to eq 0
end
it 'returns zero while running' do
10.times { subject.post { nil } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.min_length).to eq 0
end
it 'returns zero once shutdown' do
10.times { subject.post { nil } }
subject.post { latch.count_down }
latch.wait(0.1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.min_length).to eq 0
end
end
context '#max_length' do
it 'returns :max_length on creation' do
expect(subject.max_length).to eq described_class::DEFAULT_MAX_POOL_SIZE
end
it 'returns :max_length while running' do
10.times { subject.post { nil } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.max_length).to eq described_class::DEFAULT_MAX_POOL_SIZE
end
it 'returns :max_length once shutdown' do
10.times { subject.post { nil } }
subject.post { latch.count_down }
latch.wait(0.1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.max_length).to eq described_class::DEFAULT_MAX_POOL_SIZE
end
end
context '#largest_length' do
it 'returns zero on creation' do
expect(subject.largest_length).to eq 0
end
it 'returns a non-zero number once tasks have been received' do
10.times { subject.post { sleep(0.1) } }
subject.post { latch.count_down }
latch.wait(0.1)
expect(subject.largest_length).to be > 0
end
it 'returns a non-zero number after shutdown if tasks have been received' do
10.times { subject.post { sleep(0.1) } }
subject.post { latch.count_down }
latch.wait(0.1)
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
expect(subject.largest_length).to be > 0
end
end
context '#idletime' do
subject { described_class.new(idletime: 42) }
it 'returns the thread idletime' do
expect(subject.idletime).to eq 42
end
end
context 'runtime-specific implementation' do
if Concurrent.on_jruby?
context '#initialize' do
it 'sets :fallback_policy correctly' do
clazz = java.util.concurrent.ThreadPoolExecutor::DiscardPolicy
policy = clazz.new
expect(clazz).to receive(:new).at_least(:once).with(any_args).and_return(policy)
subject = CachedThreadPool.new(fallback_policy: :discard)
expect(subject.fallback_policy).to eq :discard
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it 'defaults :fallback_policy to :abort' do
subject = CachedThreadPool.new
expect(subject.fallback_policy).to eq :abort
subject.shutdown
expect(subject.wait_for_termination(pool_termination_timeout)).to eq true
end
it 'raises an exception if given an invalid :fallback_policy' do
expect {
CachedThreadPool.new(fallback_policy: :bogus)
}.to raise_error(ArgumentError)
end
end
else
context 'garbage collection' do
subject { described_class.new(idletime: 0.1, max_threads: 2, gc_interval: 0) }
it 'removes from pool any thread that has been idle too long' do
latch = Concurrent::CountDownLatch.new(4)
4.times { subject.post { sleep 0.1; latch.count_down } }
expect(latch.wait(1)).to be true
sleep 0.2
subject.post {}
sleep 0.2
expect(subject.length).to be < 4
end
it 'deals with dead threads' do
expect(subject).to receive(:ns_worker_died).exactly(5).times.and_call_original
dead_threads_queue = Queue.new
5.times { subject.post { sleep 0.1; dead_threads_queue.push Thread.current; raise Exception } }
sleep(0.2)
latch = Concurrent::CountDownLatch.new(5)
5.times { subject.post { sleep 0.1; latch.count_down } }
expect(latch.wait(1)).to be true
dead_threads = []
dead_threads << dead_threads_queue.pop until dead_threads_queue.empty?
expect(dead_threads.all? { |t| !t.alive? }).to be true
end
end
context 'worker creation and caching' do
subject { described_class.new(idletime: 1, max_threads: 5) }
it 'creates new workers when there are none available' do
expect(subject.length).to eq 0
5.times { sleep(0.1); subject << proc { sleep(1) } }
sleep(1)
expect(subject.length).to eq 5
end
it 'uses existing idle threads' do
5.times { subject << proc { sleep(0.1) } }
sleep(1)
expect(subject.length).to be >= 5
3.times { subject << proc { sleep(1) } }
sleep(0.1)
expect(subject.length).to be >= 5
end
end
end
context 'stress', notravis: true do
configurations = [
{ min_threads: 2,
max_threads: ThreadPoolExecutor::DEFAULT_MAX_POOL_SIZE,
idletime: 0.1, # 1 minute
max_queue: 0, # unlimited
fallback_policy: :caller_runs, # shouldn't matter -- 0 max queue
gc_interval: 0.1 },
{ min_threads: 2,
max_threads: 4,
idletime: 0.1, # 1 minute
max_queue: 0, # unlimited
fallback_policy: :caller_runs, # shouldn't matter -- 0 max queue
gc_interval: 0.1 }
]
configurations.each do |config|
specify do
pool = RubyThreadPoolExecutor.new(config)
10.times do
count = Concurrent::CountDownLatch.new(100)
100.times do
pool.post { count.count_down }
end
count.wait
sleep 0.01 # let the tasks end after count_down
expect(pool.length).to be <= [200, config[:max_threads]].min
if pool.length > [110, config[:max_threads]].min
puts "ERRORSIZE #{pool.length} max #{config[:max_threads]}"
end
end
pool.shutdown
end
end
end
end
end
end
|
