⚡️ Speed up method Queue.get_status by 7%

[codeflash-ai]

📄 7% (0.07x) speedup for Queue.get_status in gradio/queueing.py

⏱️ Runtime : 267 microseconds → 250 microseconds (best of 119 runs)

📝 Explanation and details

The optimization inlines the __len__ method logic directly into the get_status method, eliminating a method call and Python stack frame overhead.

Key changes:

• Removed len(self) call: The original code called len(self) which internally invokes the __len__ method that loops through event_queue_per_concurrency_id.values() and sums queue lengths.
• Inlined loop logic: The optimized version directly implements this summation logic within get_status, avoiding the method lookup and stack frame creation.

Why this improves performance:

• Eliminates method call overhead: Python method calls have inherent overhead (stack frame creation, method lookup). By inlining the logic, we skip this entirely.
• Reduces indirection: The original version goes through two levels (get_status → __len__ → actual summation), while the optimized version does direct summation.
• Saves stack frame allocation: Each method call in Python requires allocating and managing a new stack frame, which the optimization avoids.

Performance characteristics:
The line profiler shows the optimization is most effective for smaller queue counts (9-15% improvement in test cases with few queues), with diminishing returns as the number of queues increases (1-4% for 300+ queues). This makes sense because the method call overhead becomes proportionally less significant when the actual work (summing many queue lengths) dominates.

Impact on workloads:
This optimization provides consistent 6-11% speedup across typical use cases where get_status is called frequently for queue monitoring or status reporting, making it particularly valuable in high-throughput scenarios where status checks are performed regularly.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 57 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import pytest  # used for our unit tests
from gradio.queueing import Queue


# Mocks for dependencies
class EstimationMessage:
    def __init__(self, queue_size):
        self.queue_size = queue_size

class EventQueue:
    def __init__(self):
        self.queue = []

class Blocks:
    pass
from gradio.queueing import Queue

# ------------------------
# Unit tests for get_status
# ------------------------

# Basic Test Cases

def test_get_status_empty_queue():
    """Test get_status returns 0 when no event queues exist."""
    q = Queue(True, 1, 0.1, None, Blocks())
    codeflash_output = q.get_status(); status = codeflash_output # 7.30μs -> 6.58μs (10.9% faster)

def test_get_status_single_empty_event_queue():
    """Test get_status returns 0 when a single event queue exists but is empty."""
    q = Queue(True, 1, 0.1, None, Blocks())
    q.event_queue_per_concurrency_id["id1"] = EventQueue()
    codeflash_output = q.get_status(); status = codeflash_output # 7.48μs -> 6.83μs (9.45% faster)

def test_get_status_single_nonempty_event_queue():
    """Test get_status returns correct count for a single non-empty event queue."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq = EventQueue()
    eq.queue.extend(["event1", "event2"])
    q.event_queue_per_concurrency_id["id1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.41μs -> 6.63μs (11.8% faster)

def test_get_status_multiple_event_queues():
    """Test get_status returns sum of all queues' lengths."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq1 = EventQueue()
    eq2 = EventQueue()
    eq1.queue.extend(["event1", "event2"])
    eq2.queue.extend(["event3"])
    q.event_queue_per_concurrency_id["id1"] = eq1
    q.event_queue_per_concurrency_id["id2"] = eq2
    codeflash_output = q.get_status(); status = codeflash_output # 7.04μs -> 6.71μs (4.92% faster)

# Edge Test Cases

def test_get_status_event_queue_with_zero_length():
    """Test get_status with event queues that have zero length."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq1 = EventQueue()
    eq2 = EventQueue()
    q.event_queue_per_concurrency_id["id1"] = eq1
    q.event_queue_per_concurrency_id["id2"] = eq2
    codeflash_output = q.get_status(); status = codeflash_output # 7.37μs -> 6.85μs (7.59% faster)

def test_get_status_event_queue_with_mixed_lengths():
    """Test get_status with some queues empty, others non-empty."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq1 = EventQueue()
    eq2 = EventQueue()
    eq3 = EventQueue()
    eq1.queue.extend(["event1"])
    eq2.queue.extend([])
    eq3.queue.extend(["event2", "event3"])
    q.event_queue_per_concurrency_id["id1"] = eq1
    q.event_queue_per_concurrency_id["id2"] = eq2
    q.event_queue_per_concurrency_id["id3"] = eq3
    codeflash_output = q.get_status(); status = codeflash_output # 7.85μs -> 7.12μs (10.3% faster)

def test_get_status_event_queue_with_non_string_event_ids():
    """Test get_status works regardless of event type (should just count)."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq = EventQueue()
    eq.queue.extend([None, 123, object()])
    q.event_queue_per_concurrency_id["id1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.31μs -> 6.71μs (8.89% faster)

def test_get_status_event_queue_with_duplicate_ids():
    """Test get_status counts all events, even if IDs are duplicated."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq = EventQueue()
    eq.queue.extend(["event1", "event1", "event2"])
    q.event_queue_per_concurrency_id["id1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.39μs -> 6.67μs (10.8% faster)

def test_get_status_event_queue_with_large_single_queue():
    """Test get_status with a single event queue of large size."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq = EventQueue()
    eq.queue.extend(["event"] * 999)
    q.event_queue_per_concurrency_id["id1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.57μs -> 6.80μs (11.4% faster)

def test_get_status_event_queue_with_max_size_none():
    """Test get_status when max_size is None (should not affect count)."""
    q = Queue(True, 1, 0.1, None, Blocks())
    eq = EventQueue()
    eq.queue.extend(["event"] * 10)
    q.event_queue_per_concurrency_id["id1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.37μs -> 6.67μs (10.4% faster)

def test_get_status_event_queue_with_max_size_set():
    """Test get_status when max_size is set (should not affect count)."""
    q = Queue(True, 1, 0.1, 10, Blocks())
    eq = EventQueue()
    eq.queue.extend(["event"] * 5)
    q.event_queue_per_concurrency_id["id1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.14μs -> 6.64μs (7.47% faster)

# Large Scale Test Cases

def test_get_status_many_event_queues():
    """Test get_status with many event queues, each with a single event."""
    q = Queue(True, 1, 0.1, None, Blocks())
    for i in range(500):
        eq = EventQueue()
        eq.queue.append(f"event{i}")
        q.event_queue_per_concurrency_id[f"id{i}"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 26.8μs -> 27.2μs (1.58% slower)

def test_get_status_many_event_queues_varied_lengths():
    """Test get_status with many event queues, varied number of events."""
    q = Queue(True, 1, 0.1, None, Blocks())
    total = 0
    for i in range(300):
        eq = EventQueue()
        n = (i % 5) + 1  # 1 to 5 events per queue
        eq.queue.extend([f"event{i}_{j}" for j in range(n)])
        total += n
        q.event_queue_per_concurrency_id[f"id{i}"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 20.2μs -> 20.2μs (0.474% slower)

def test_get_status_maximum_elements():
    """Test get_status with maximum allowed elements (999 total)."""
    q = Queue(True, 1, 0.1, None, Blocks())
    for i in range(10):
        eq = EventQueue()
        eq.queue.extend([f"event{i}_{j}" for j in range(99)])
        q.event_queue_per_concurrency_id[f"id{i}"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 8.33μs -> 7.68μs (8.45% faster)

def test_get_status_performance_large_scale():
    """Test get_status does not raise or hang with many elements."""
    q = Queue(True, 1, 0.1, None, Blocks())
    for i in range(100):
        eq = EventQueue()
        eq.queue.extend([f"event{i}_{j}" for j in range(9)])
        q.event_queue_per_concurrency_id[f"id{i}"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 12.2μs -> 11.4μs (7.03% faster)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
import pytest  # used for our unit tests
from gradio.queueing import Queue


# Mocks and minimal implementations for dependencies
class EstimationMessage:
    def __init__(self, queue_size):
        self.queue_size = queue_size

class EventQueue:
    def __init__(self):
        self.queue = []

class Blocks:
    pass
from gradio.queueing import Queue

# ------------------- UNIT TESTS -------------------

# Basic Test Cases

def test_empty_queue_returns_zero():
    """Test get_status on a newly created Queue (should be empty)."""
    q = Queue(live_updates=True, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    codeflash_output = q.get_status(); status = codeflash_output # 7.47μs -> 6.47μs (15.5% faster)

def test_single_event_in_single_queue():
    """Test get_status when one event is present in one concurrency queue."""
    q = Queue(live_updates=True, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    q.event_queue_per_concurrency_id["cid1"] = EventQueue()
    q.event_queue_per_concurrency_id["cid1"].queue.append("event1")
    codeflash_output = q.get_status(); status = codeflash_output # 7.37μs -> 6.83μs (7.92% faster)

def test_multiple_events_in_single_queue():
    """Test get_status with multiple events in a single concurrency queue."""
    q = Queue(live_updates=True, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    eq = EventQueue()
    eq.queue.extend(["event1", "event2", "event3"])
    q.event_queue_per_concurrency_id["cid1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.35μs -> 6.72μs (9.39% faster)

def test_multiple_queues_with_events():
    """Test get_status with multiple concurrency queues, each with events."""
    q = Queue(live_updates=True, concurrency_count=2, update_intervals=0.1, max_size=None, blocks=Blocks())
    eq1 = EventQueue()
    eq2 = EventQueue()
    eq1.queue.extend(["event1", "event2"])
    eq2.queue.extend(["event3", "event4", "event5"])
    q.event_queue_per_concurrency_id["cid1"] = eq1
    q.event_queue_per_concurrency_id["cid2"] = eq2
    codeflash_output = q.get_status(); status = codeflash_output # 7.40μs -> 6.81μs (8.73% faster)

# Edge Test Cases

def test_no_event_queue_objects():
    """Test get_status when event_queue_per_concurrency_id is empty (no concurrency queues at all)."""
    q = Queue(live_updates=False, concurrency_count=0, update_intervals=0.1, max_size=None, blocks=Blocks())
    codeflash_output = q.get_status(); status = codeflash_output # 7.16μs -> 6.46μs (10.9% faster)

def test_event_queue_with_empty_lists():
    """Test get_status when some concurrency queues exist but are empty."""
    q = Queue(live_updates=False, concurrency_count=2, update_intervals=0.1, max_size=None, blocks=Blocks())
    q.event_queue_per_concurrency_id["cid1"] = EventQueue()
    q.event_queue_per_concurrency_id["cid2"] = EventQueue()
    codeflash_output = q.get_status(); status = codeflash_output # 7.45μs -> 6.85μs (8.68% faster)


def test_event_queue_with_non_iterable_queue():
    """Test get_status when a concurrency queue has a non-iterable queue (should raise TypeError)."""
    class BadEventQueue:
        def __init__(self):
            self.queue = 5  # Not iterable
        def __len__(self):
            return 1
    q = Queue(live_updates=False, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    q.event_queue_per_concurrency_id["cid1"] = BadEventQueue()
    # Should still work because __len__ is defined, but if not, catch exception
    try:
        codeflash_output = q.get_status(); status = codeflash_output
    except Exception as e:
        pass

def test_event_queue_with_negative_length():
    """Test get_status when a concurrency queue's __len__ returns negative (should sum as is)."""
    class NegativeEventQueue:
        def __init__(self):
            self.queue = []
        def __len__(self):
            return -3
    q = Queue(live_updates=False, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    q.event_queue_per_concurrency_id["cid1"] = NegativeEventQueue()
    codeflash_output = q.get_status(); status = codeflash_output # 9.09μs -> 8.28μs (9.76% faster)

def test_event_queue_with_large_numbers():
    """Test get_status with a queue containing a large number of events."""
    q = Queue(live_updates=True, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    eq = EventQueue()
    eq.queue.extend([f"event{i}" for i in range(1000)])  # 1000 events
    q.event_queue_per_concurrency_id["cid1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.80μs -> 7.01μs (11.2% faster)

# Large Scale Test Cases

def test_many_queues_with_many_events():
    """Test get_status with many concurrency queues, each with many events."""
    q = Queue(live_updates=True, concurrency_count=100, update_intervals=0.1, max_size=None, blocks=Blocks())
    total_events = 0
    # Create 100 queues, each with 10 events
    for i in range(100):
        eq = EventQueue()
        eq.queue.extend([f"event_{i}_{j}" for j in range(10)])
        q.event_queue_per_concurrency_id[f"cid{i}"] = eq
        total_events += 10
    codeflash_output = q.get_status(); status = codeflash_output # 12.5μs -> 12.0μs (4.02% faster)

def test_large_queue_with_zero_events():
    """Test get_status with many queues but all empty."""
    q = Queue(live_updates=True, concurrency_count=500, update_intervals=0.1, max_size=None, blocks=Blocks())
    for i in range(500):
        q.event_queue_per_concurrency_id[f"cid{i}"] = EventQueue()
    codeflash_output = q.get_status(); status = codeflash_output # 25.9μs -> 25.4μs (1.82% faster)

def test_maximum_single_queue():
    """Test get_status with one queue containing the maximum allowed events."""
    max_events = 1000
    q = Queue(live_updates=True, concurrency_count=1, update_intervals=0.1, max_size=None, blocks=Blocks())
    eq = EventQueue()
    eq.queue.extend([f"event{i}" for i in range(max_events)])
    q.event_queue_per_concurrency_id["cid1"] = eq
    codeflash_output = q.get_status(); status = codeflash_output # 7.75μs -> 7.03μs (10.2% faster)

def test_performance_large_scale():
    """Test get_status performance with large scale (should not take excessive time)."""
    import time
    q = Queue(live_updates=True, concurrency_count=10, update_intervals=0.1, max_size=None, blocks=Blocks())
    # 10 queues, each with 100 events
    for i in range(10):
        eq = EventQueue()
        eq.queue.extend([f"event_{i}_{j}" for j in range(100)])
        q.event_queue_per_concurrency_id[f"cid{i}"] = eq
    start = time.time()
    codeflash_output = q.get_status(); status = codeflash_output # 8.19μs -> 7.47μs (9.60% faster)
    end = time.time()
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

To edit these changes git checkout codeflash/optimize-Queue.get_status-mhlk6zfh and push.