⚡️ Speed up function get_server_root_path by 12%

[codeflash-ai]

📄 12% (0.12x) speedup for get_server_root_path in litellm/proxy/utils.py

⏱️ Runtime : 167 microseconds → 149 microseconds (best of 365 runs)

📝 Explanation and details

The optimization replaces os.getenv("SERVER_ROOT_PATH", "/") with os.environ.get("SERVER_ROOT_PATH", "/"). This change achieves a 12% speedup by eliminating one level of function call indirection.

Key Performance Difference:

• os.getenv() is a wrapper function that internally calls os.environ.get()
• os.environ.get() directly accesses the environment dictionary without the wrapper overhead

Why This Optimization Works:
In Python, os.getenv() adds a small but measurable function call overhead. Since os.environ is a mapping object (specifically a _Environ instance that behaves like a dictionary), calling its .get() method directly eliminates the intermediate function call layer. The line profiler results show the per-hit time improved from 3625.6ns to 3325.3ns.

Test Case Performance:
The optimization shows consistent improvements across all test scenarios:

• Basic cases (simple paths, empty strings): 13-22% faster
• Edge cases (special characters, unicode, long strings): 6-29% faster, with particularly strong gains on complex strings
• Large scale cases (very long paths, repeated operations): 5-20% faster

This micro-optimization is especially valuable for frequently called utility functions like get_server_root_path(), where even small per-call improvements compound significantly in high-throughput scenarios.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 179 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	✅ 1 Passed
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import os

# imports
import pytest  # used for our unit tests
from litellm.proxy.utils import get_server_root_path

################################
# 1. Basic Test Cases
################################

def test_default_root_path(monkeypatch):
    """
    Basic: When SERVER_ROOT_PATH is not set, should return "/"
    """
    monkeypatch.delenv("SERVER_ROOT_PATH", raising=False)
    codeflash_output = get_server_root_path() # 1.56μs -> 1.34μs (16.8% faster)

def test_env_var_set_simple(monkeypatch):
    """
    Basic: When SERVER_ROOT_PATH is set to a simple value, should return that value
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "/api")
    codeflash_output = get_server_root_path() # 1.31μs -> 1.08μs (21.5% faster)

def test_env_var_set_empty_string(monkeypatch):
    """
    Basic: When SERVER_ROOT_PATH is set to empty string, should return ""
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "")
    codeflash_output = get_server_root_path() # 1.32μs -> 1.16μs (13.4% faster)

def test_env_var_set_root(monkeypatch):
    """
    Basic: When SERVER_ROOT_PATH is set to "/", should return "/"
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "/")
    codeflash_output = get_server_root_path() # 1.34μs -> 1.15μs (16.7% faster)

def test_env_var_set_custom_path(monkeypatch):
    """
    Basic: When SERVER_ROOT_PATH is set to a custom path, should return that path
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "/custom/root")
    codeflash_output = get_server_root_path() # 1.32μs -> 1.12μs (17.6% faster)

################################
# 2. Edge Test Cases
################################

def test_env_var_set_whitespace(monkeypatch):
    """
    Edge: When SERVER_ROOT_PATH is set to whitespace, should return whitespace
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "   ")
    codeflash_output = get_server_root_path() # 1.38μs -> 1.12μs (23.5% faster)

def test_env_var_set_special_chars(monkeypatch):
    """
    Edge: When SERVER_ROOT_PATH is set to special characters, should return them
    """
    special_path = "/api/!@#$%^&*()_+-=[]{}|;':,.<>?"
    monkeypatch.setenv("SERVER_ROOT_PATH", special_path)
    codeflash_output = get_server_root_path() # 1.47μs -> 1.15μs (28.6% faster)

def test_env_var_set_unicode(monkeypatch):
    """
    Edge: When SERVER_ROOT_PATH contains unicode, should return unicode
    """
    unicode_path = "/сервер/根/🦄"
    monkeypatch.setenv("SERVER_ROOT_PATH", unicode_path)
    codeflash_output = get_server_root_path() # 2.40μs -> 2.27μs (6.09% faster)

def test_env_var_set_long_string(monkeypatch):
    """
    Edge: When SERVER_ROOT_PATH is a long string, should return the long string
    """
    long_path = "/" + "a" * 255
    monkeypatch.setenv("SERVER_ROOT_PATH", long_path)
    codeflash_output = get_server_root_path() # 1.55μs -> 1.21μs (28.8% faster)

def test_env_var_set_none(monkeypatch):
    """
    Edge: When SERVER_ROOT_PATH is explicitly set to None, should treat as unset and return "/"
    """
    monkeypatch.delenv("SERVER_ROOT_PATH", raising=False)
    # os.environ cannot have None as a value, so simulate unset
    codeflash_output = get_server_root_path() # 1.77μs -> 1.44μs (23.0% faster)

def test_env_var_case_sensitivity(monkeypatch):
    """
    Edge: Should be case-sensitive to SERVER_ROOT_PATH
    """
    monkeypatch.setenv("server_root_path", "/lowercase")
    # Should still return default ("/"), since env var name is case sensitive
    codeflash_output = get_server_root_path() # 1.66μs -> 1.35μs (22.8% faster)

def test_env_var_with_leading_trailing_spaces(monkeypatch):
    """
    Edge: Should preserve leading/trailing spaces in env var value
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "  /api/v1  ")
    codeflash_output = get_server_root_path() # 1.46μs -> 1.17μs (24.7% faster)

################################
# 3. Large Scale Test Cases
################################

def test_env_var_set_max_length(monkeypatch):
    """
    Large Scale: When SERVER_ROOT_PATH is set to a very large string (1000 chars), should return it
    """
    large_path = "/" + "x" * 999
    monkeypatch.setenv("SERVER_ROOT_PATH", large_path)
    codeflash_output = get_server_root_path(); result = codeflash_output # 1.79μs -> 1.49μs (20.3% faster)

def test_env_var_set_many_times(monkeypatch):
    """
    Large Scale: Set SERVER_ROOT_PATH repeatedly with different values, should always return the latest
    """
    for i in range(10):
        path = f"/api/{i}"
        os.environ["SERVER_ROOT_PATH"] = path
        codeflash_output = get_server_root_path() # 7.96μs -> 7.11μs (11.9% faster)
    # Clean up
    del os.environ["SERVER_ROOT_PATH"]

def test_env_var_set_with_various_types(monkeypatch):
    """
    Large Scale: Set SERVER_ROOT_PATH to various types converted to string, should return string representation
    """
    # Integer
    monkeypatch.setenv("SERVER_ROOT_PATH", str(123))
    codeflash_output = get_server_root_path() # 1.33μs -> 1.06μs (25.9% faster)
    # Boolean
    monkeypatch.setenv("SERVER_ROOT_PATH", str(True))
    codeflash_output = get_server_root_path() # 889ns -> 816ns (8.95% faster)
    # Float
    monkeypatch.setenv("SERVER_ROOT_PATH", str(3.14159))
    codeflash_output = get_server_root_path() # 751ns -> 689ns (9.00% faster)

def test_env_var_set_with_many_unique_values(monkeypatch):
    """
    Large Scale: Test with 100 unique values, should always return the correct one
    """
    for i in range(100):
        path = f"/unique/{i}"
        monkeypatch.setenv("SERVER_ROOT_PATH", path)
        codeflash_output = get_server_root_path() # 70.5μs -> 64.8μs (8.71% faster)

def test_env_var_set_to_path_like_strings(monkeypatch):
    """
    Large Scale: Test with many path-like strings, including nested and deep paths
    """
    for depth in range(1, 21):  # up to 20 levels deep
        path = "/" + "/".join([f"dir{i}" for i in range(depth)])
        monkeypatch.setenv("SERVER_ROOT_PATH", path)
        codeflash_output = get_server_root_path() # 15.4μs -> 14.2μs (8.12% faster)

################################
# Mutation Testing: Negative Tests
################################

def test_mutation_default(monkeypatch):
    """
    Mutation: If the function is mutated to return something other than "/", this should fail.
    """
    monkeypatch.delenv("SERVER_ROOT_PATH", raising=False)
    codeflash_output = get_server_root_path(); result = codeflash_output # 1.67μs -> 1.41μs (18.9% faster)

def test_mutation_env(monkeypatch):
    """
    Mutation: If the function is mutated to ignore the env var, this should fail.
    """
    monkeypatch.setenv("SERVER_ROOT_PATH", "/envtest")
    codeflash_output = get_server_root_path(); result = codeflash_output # 1.31μs -> 1.09μs (20.3% faster)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
import os

# imports
import pytest  # used for our unit tests
from litellm.proxy.utils import get_server_root_path

# -------------------------
# Basic Test Cases
# -------------------------

def test_default_path_when_env_not_set():
    """Should return '/' when SERVER_ROOT_PATH is not set."""
    codeflash_output = get_server_root_path() # 2.22μs -> 2.03μs (9.72% faster)

def test_env_var_set_to_simple_path(monkeypatch):
    """Should return the value of SERVER_ROOT_PATH if set to a simple path."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "/api")
    codeflash_output = get_server_root_path() # 1.45μs -> 1.23μs (18.1% faster)

def test_env_var_set_to_root(monkeypatch):
    """Should return '/' if SERVER_ROOT_PATH is set to '/'."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "/")
    codeflash_output = get_server_root_path() # 1.46μs -> 1.23μs (18.2% faster)

def test_env_var_set_to_empty_string(monkeypatch):
    """Should return '' if SERVER_ROOT_PATH is set to empty string."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "")
    codeflash_output = get_server_root_path() # 1.45μs -> 1.23μs (18.0% faster)

def test_env_var_set_to_non_slash_path(monkeypatch):
    """Should return the value if SERVER_ROOT_PATH is set to a non-slash path."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "api/v1")
    codeflash_output = get_server_root_path() # 1.50μs -> 1.26μs (19.0% faster)

# -------------------------
# Edge Test Cases
# -------------------------

def test_env_var_set_to_whitespace(monkeypatch):
    """Should return whitespace string if SERVER_ROOT_PATH is set to whitespace."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "   ")
    codeflash_output = get_server_root_path() # 1.47μs -> 1.18μs (24.6% faster)

def test_env_var_set_to_long_path(monkeypatch):
    """Should handle a very long path string."""
    long_path = "/" + "a" * 500
    monkeypatch.setenv("SERVER_ROOT_PATH", long_path)
    codeflash_output = get_server_root_path() # 1.73μs -> 1.36μs (27.5% faster)

def test_env_var_set_to_special_characters(monkeypatch):
    """Should handle special characters in the path."""
    special_path = "/api/!@#$%^&*()_+-=~`"
    monkeypatch.setenv("SERVER_ROOT_PATH", special_path)
    codeflash_output = get_server_root_path() # 1.49μs -> 1.25μs (19.1% faster)

def test_env_var_set_to_unicode(monkeypatch):
    """Should handle unicode characters in the path."""
    unicode_path = "/api/路径/テスト"
    monkeypatch.setenv("SERVER_ROOT_PATH", unicode_path)
    codeflash_output = get_server_root_path() # 2.30μs -> 2.06μs (11.9% faster)

def test_env_var_set_to_none(monkeypatch):
    """Should return '/' if SERVER_ROOT_PATH is set to None (which is ignored by os.environ)."""
    monkeypatch.delenv("SERVER_ROOT_PATH", raising=False)
    codeflash_output = get_server_root_path() # 1.79μs -> 1.45μs (23.2% faster)

def test_env_var_set_to_numeric_string(monkeypatch):
    """Should handle numeric string values."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "12345")
    codeflash_output = get_server_root_path() # 1.44μs -> 1.20μs (20.4% faster)

def test_env_var_set_to_path_with_spaces(monkeypatch):
    """Should handle paths with spaces."""
    path_with_spaces = "/api/v1 with spaces"
    monkeypatch.setenv("SERVER_ROOT_PATH", path_with_spaces)
    codeflash_output = get_server_root_path() # 1.48μs -> 1.23μs (20.8% faster)

def test_env_var_set_to_path_with_trailing_slash(monkeypatch):
    """Should handle paths with trailing slash."""
    path_with_trailing_slash = "/api/v1/"
    monkeypatch.setenv("SERVER_ROOT_PATH", path_with_trailing_slash)
    codeflash_output = get_server_root_path() # 1.43μs -> 1.23μs (17.1% faster)

def test_env_var_set_to_path_with_multiple_slashes(monkeypatch):
    """Should handle paths with multiple consecutive slashes."""
    path_with_multiple_slashes = "//api///v1//"
    monkeypatch.setenv("SERVER_ROOT_PATH", path_with_multiple_slashes)
    codeflash_output = get_server_root_path() # 1.45μs -> 1.22μs (18.5% faster)

# -------------------------
# Large Scale Test Cases
# -------------------------

def test_env_var_set_to_max_length(monkeypatch):
    """Should handle a path of length 1000."""
    max_length_path = "/" + "x" * 999  # total length = 1000
    monkeypatch.setenv("SERVER_ROOT_PATH", max_length_path)
    codeflash_output = get_server_root_path() # 1.85μs -> 1.54μs (20.1% faster)

def test_env_var_set_to_many_segments(monkeypatch):
    """Should handle a path with many segments."""
    segments = [f"seg{i}" for i in range(1000)]
    long_segment_path = "/" + "/".join(segments)
    monkeypatch.setenv("SERVER_ROOT_PATH", long_segment_path)
    codeflash_output = get_server_root_path() # 2.38μs -> 2.08μs (14.7% faster)

def test_env_var_set_to_large_unicode_string(monkeypatch):
    """Should handle a large unicode string path."""
    unicode_segment = "路径"
    large_unicode_path = "/" + "/".join([unicode_segment]*500)
    monkeypatch.setenv("SERVER_ROOT_PATH", large_unicode_path)
    codeflash_output = get_server_root_path() # 4.87μs -> 4.60μs (5.82% faster)

def test_env_var_set_to_repeated_special_characters(monkeypatch):
    """Should handle a path of repeated special characters."""
    special_chars = "!@#$%^&*()"
    repeated_special_path = "/" + (special_chars * 100)
    monkeypatch.setenv("SERVER_ROOT_PATH", repeated_special_path)
    codeflash_output = get_server_root_path() # 1.86μs -> 1.57μs (18.6% faster)

# -------------------------
# Determinism and Isolation
# -------------------------

def test_determinism(monkeypatch):
    """Should always return the same value for the same environment variable."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "/deterministic")
    for _ in range(10):
        codeflash_output = get_server_root_path() # 7.59μs -> 6.83μs (11.0% faster)

def test_isolation(monkeypatch):
    """Changing SERVER_ROOT_PATH between calls should update the return value."""
    monkeypatch.setenv("SERVER_ROOT_PATH", "/first")
    codeflash_output = get_server_root_path() # 1.40μs -> 1.10μs (27.7% faster)
    monkeypatch.setenv("SERVER_ROOT_PATH", "/second")
    codeflash_output = get_server_root_path() # 921ns -> 770ns (19.6% faster)
    monkeypatch.delenv("SERVER_ROOT_PATH", raising=False)
    codeflash_output = get_server_root_path() # 1.11μs -> 993ns (11.7% faster)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
from litellm.proxy.utils import get_server_root_path

def test_get_server_root_path():
    get_server_root_path()

🔎 Concolic Coverage Tests and Runtime

Test File::Test Function	Original ⏱️	Optimized ⏱️	Speedup
codeflash_concolic_evt0erui/tmpq1c0njxo/test_concolic_coverage.py::test_get_server_root_path	2.13μs	1.77μs	20.5%✅

To edit these changes git checkout codeflash/optimize-get_server_root_path-mhbqc2o9 and push.