⚡️ Speed up method BasedpyrightServer.get_command by 620%

[codeflash-ai]

📄 620% (6.20x) speedup for BasedpyrightServer.get_command in marimo/_server/lsp.py

⏱️ Runtime : 142 milliseconds → 19.8 milliseconds (best of 14 runs)

📝 Explanation and details

The optimization applies function-level caching using @lru_cache(maxsize=1) to two utility functions that are called repeatedly but return constant values during program execution.

Key Changes:

• marimo_package_path() and get_log_directory() are decorated with @lru_cache(maxsize=1)
• Both functions now cache their results after the first call

Why This Provides a 619% Speedup:

1. Eliminated Expensive System Operations: The line profiler shows marimo_package_path() originally spent 100% of its time in import_files("marimo"), and get_log_directory() spent 98.7% of its time in marimo_log_dir(). These operations likely involve filesystem traversal and module introspection.

2. Massive Hit Reduction: In the original code, these functions were called 2,126+ times each, performing the same expensive operations repeatedly. With caching, the expensive operations only run once.

3. Profiler Evidence: The optimized version shows dramatic time reductions - get_command() went from 423ms total time to 76ms, with the cached function calls now taking microseconds instead of tens of milliseconds per call.

Impact on Workloads:
These functions return paths that are constant for a given program execution (package installation path and log directory), making them ideal caching candidates. The optimization is particularly effective for the BasedpyrightServer.get_command() method which appears to be called frequently based on the test cases showing 500-800% improvements across various scenarios.

Test Case Performance:
All test cases show consistent 450-800% speedups, indicating the optimization works well regardless of port values or edge cases, since the bottleneck was in the path resolution functions, not the port handling logic.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 4249 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	✅ 2 Passed
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import shutil
import tempfile
from pathlib import Path

imports

import pytest
from marimo._server.lsp import BasedpyrightServer

--- Class under test ---

class BaseLspServer:
# Minimal stub for base class
def init(self, port=12345):
self.port = port
from marimo._server.lsp import BasedpyrightServer

--- Test Environment Setup ---

class BasedpyrightServerTestEnv:
marimo_dir = None
cache_dir = None

@classmethod
def setup_env(cls):
    # Create temp dirs for marimo package and cache
    cls.temp_dir = tempfile.mkdtemp()
    cls.marimo_dir = Path(cls.temp_dir) / "marimo"
    cls.marimo_dir.mkdir()
    # Create _lsp/index.cjs file
    lsp_dir = cls.marimo_dir / "_lsp"
    lsp_dir.mkdir()
    (lsp_dir / "index.cjs").write_text("// dummy lsp index")
    # Create cache/logs dir
    cls.cache_dir = Path(cls.temp_dir) / ".cache" / "marimo"
    logs_dir = cls.cache_dir / "logs"
    logs_dir.mkdir(parents=True)

@classmethod
def teardown_env(cls):
    shutil.rmtree(cls.temp_dir, ignore_errors=True)

--- Unit Tests ---

1. Basic Test Cases

def test_get_command_with_custom_port():
"""Test that get_command uses the custom port."""
server = BasedpyrightServer(port=9999)
codeflash_output = server.get_command(); cmd = codeflash_output # 102μs -> 16.8μs (510% faster)
port_index = cmd.index("--port") + 1

def test_get_command_with_negative_port():
"""Test get_command with a negative port number."""
server = BasedpyrightServer(port=-1)
codeflash_output = server.get_command(); cmd = codeflash_output # 100μs -> 15.9μs (536% faster)
port_index = cmd.index("--port") + 1

def test_get_command_with_zero_port():
"""Test get_command with port zero (often reserved)."""
server = BasedpyrightServer(port=0)
codeflash_output = server.get_command(); cmd = codeflash_output # 86.4μs -> 14.1μs (512% faster)
port_index = cmd.index("--port") + 1

def test_get_command_with_large_port():
"""Test get_command with a very large port number."""
large_port = 65535
server = BasedpyrightServer(port=large_port)
codeflash_output = server.get_command(); cmd = codeflash_output # 81.6μs -> 13.9μs (489% faster)
port_index = cmd.index("--port") + 1

def test_get_command_with_non_integer_port():
"""Test get_command with a non-integer port (should coerce to str)."""
class DummyServer(BasedpyrightServer):
def init(self):
self.port = "abc"
server = DummyServer()
codeflash_output = server.get_command(); cmd = codeflash_output # 87.7μs -> 13.4μs (556% faster)
port_index = cmd.index("--port") + 1

def test_get_command_many_ports():
"""Test get_command with a large range of port numbers, ensuring output is correct."""
for port in range(1000, 2000, 100): # 10 ports
server = BasedpyrightServer(port=port)
codeflash_output = server.get_command(); cmd = codeflash_output # 562μs -> 68.1μs (727% faster)
port_index = cmd.index("--port") + 1

def test_get_command_multiple_instances():
"""Test creating many BasedpyrightServer instances and calling get_command."""
servers = [BasedpyrightServer(port=i) for i in range(100, 200)]
for i, server in enumerate(servers):
codeflash_output = server.get_command(); cmd = codeflash_output # 5.08ms -> 578μs (777% faster)
port_index = cmd.index("--port") + 1

#------------------------------------------------
from pathlib import Path

imports

import pytest
from marimo._server.lsp import BasedpyrightServer

--- Function to test (minimal viable implementation for testability) ---

class BaseLspServer:
def init(self, port):
self.port = port
from marimo._server.lsp import BasedpyrightServer

--- Unit tests ---

Basic Test Cases

def test_get_command_basic_port():
"""Test with a standard port number."""
server = BasedpyrightServer(port=8080)
codeflash_output = server.get_command(); cmd = codeflash_output # 87.8μs -> 13.3μs (562% faster)
port_index = cmd.index("--port") + 1
lsp_index = cmd.index("--lsp") + 1
log_index = cmd.index("--log-file") + 1

def test_get_command_port_as_string():
"""Test with port as a string (should be converted to str)."""
server = BasedpyrightServer(port="1234")
codeflash_output = server.get_command(); cmd = codeflash_output # 85.2μs -> 13.3μs (539% faster)
port_index = cmd.index("--port") + 1

def test_get_command_port_zero():
"""Test with port 0 (edge case: lowest valid port)."""
server = BasedpyrightServer(port=0)
codeflash_output = server.get_command(); cmd = codeflash_output # 82.9μs -> 13.6μs (508% faster)
port_index = cmd.index("--port") + 1

def test_get_command_port_max():
"""Test with port 65535 (edge case: highest valid port)."""
server = BasedpyrightServer(port=65535)
codeflash_output = server.get_command(); cmd = codeflash_output # 84.1μs -> 13.4μs (528% faster)
port_index = cmd.index("--port") + 1

Edge Test Cases

def test_get_command_negative_port():
"""Test with negative port (should still convert to str, but is invalid for networking)."""
server = BasedpyrightServer(port=-1)
codeflash_output = server.get_command(); cmd = codeflash_output # 82.8μs -> 13.3μs (523% faster)
port_index = cmd.index("--port") + 1

def test_get_command_large_port():
"""Test with a port number larger than 65535."""
server = BasedpyrightServer(port=99999)
codeflash_output = server.get_command(); cmd = codeflash_output # 83.7μs -> 12.8μs (554% faster)
port_index = cmd.index("--port") + 1

def test_get_command_non_integer_port():
"""Test with a non-integer port value (float)."""
server = BasedpyrightServer(port=1234.56)
codeflash_output = server.get_command(); cmd = codeflash_output # 85.8μs -> 15.5μs (453% faster)
port_index = cmd.index("--port") + 1

def test_get_command_none_port():
"""Test with port as None (should be stringified as 'None')."""
server = BasedpyrightServer(port=None)
codeflash_output = server.get_command(); cmd = codeflash_output # 81.6μs -> 13.5μs (503% faster)
port_index = cmd.index("--port") + 1

def test_get_command_path_injection():
"""Test that the lsp_bin and log_file paths are correct and do not allow injection."""
server = BasedpyrightServer(port=1234)
codeflash_output = server.get_command(); cmd = codeflash_output # 82.7μs -> 13.0μs (535% faster)
lsp_bin = cmd[1]
log_file = cmd[-1]

def test_get_command_invalid_port_type():
"""Test with a complex object as port, which should stringify to its repr."""
class WeirdPort:
def str(self):
return "weird-port"
server = BasedpyrightServer(port=WeirdPort())
codeflash_output = server.get_command(); cmd = codeflash_output # 102μs -> 16.8μs (508% faster)
port_index = cmd.index("--port") + 1

Large Scale Test Cases

@pytest.mark.parametrize("port", [str(i) for i in range(1000)])
def test_get_command_many_ports(port):
"""Test with many different port numbers (scalability)."""
server = BasedpyrightServer(port=port)
codeflash_output = server.get_command(); cmd = codeflash_output # 85.2ms -> 13.3ms (539% faster)
port_index = cmd.index("--port") + 1

def test_get_command_performance_large_scale():
"""Test performance with large number of server instances."""
# Not a true performance test, but checks for scalability up to 1000 instances
servers = [BasedpyrightServer(port=i) for i in range(1000)]
for i, server in enumerate(servers):
codeflash_output = server.get_command(); cmd = codeflash_output # 49.8ms -> 5.54ms (799% faster)
port_index = cmd.index("--port") + 1

codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

#------------------------------------------------
from marimo._server.lsp import BasedpyrightServer

def test_BasedpyrightServer_get_command():
BasedpyrightServer.get_command(BasedpyrightServer(0))

🔎 Concolic Coverage Tests and Runtime

Test File::Test Function	Original ⏱️	Optimized ⏱️	Speedup
codeflash_concolic_bps3n5s8/tmpmk8igp0d/test_concolic_coverage.py::test_BasedpyrightServer_get_command	100μs	15.3μs	557%✅

To edit these changes git checkout codeflash/optimize-BasedpyrightServer.get_command-mhveo1yf and push.