⚡️ Speed up method ValkeyDB._format_timestamp by 13%
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The optimization improves the `_format_timestamp` method by avoiding redundant timezone object creation for UTC timestamps.
**Key Changes:**
- Added a fast-path check `if timezone is None or timezone == "UTC"` that bypasses `pytz.timezone()` lookup
- For UTC cases, uses `datetime.utcfromtimestamp()` directly with `pytz.UTC` instead of creating a timezone object via `pytz.timezone("UTC")`
**Why This Is Faster:**
- `pytz.timezone()` performs string lookup and timezone object instantiation, which is expensive (18.7% of original runtime)
- `datetime.utcfromtimestamp()` is a direct C-level operation that's much faster than `datetime.fromtimestamp()` with timezone conversion
- The UTC fast-path eliminates the timezone lookup entirely for the most common case
**Performance Impact:**
- Line profiler shows timezone lookup time reduced from 22,317ns to 6,318ns (72% reduction)
- Overall method execution improved by 13% (70.7μs → 62.5μs)
This optimization is particularly effective for applications that primarily work with UTC timestamps, which is common in distributed systems and APIs where UTC is the standard.
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📄 13% (0.13x) speedup for
ValkeyDB._format_timestampinmem0/vector_stores/valkey.py⏱️ Runtime :
70.7 microseconds→62.5 microseconds(best of60runs)📝 Explanation and details
The optimization improves the
_format_timestampmethod by avoiding redundant timezone object creation for UTC timestamps.Key Changes:
if timezone is None or timezone == "UTC"that bypassespytz.timezone()lookupdatetime.utcfromtimestamp()directly withpytz.UTCinstead of creating a timezone object viapytz.timezone("UTC")Why This Is Faster:
pytz.timezone()performs string lookup and timezone object instantiation, which is expensive (18.7% of original runtime)datetime.utcfromtimestamp()is a direct C-level operation that's much faster thandatetime.fromtimestamp()with timezone conversionPerformance Impact:
This optimization is particularly effective for applications that primarily work with UTC timestamps, which is common in distributed systems and APIs where UTC is the standard.
✅ Correctness verification report:
⏪ Replay Tests and Runtime
test_pytest_testsconfigstest_prompts_py_testsvector_storestest_weaviate_py_testsllmstest_deepseek_py_test__replay_test_0.py::test_mem0_vector_stores_valkey_ValkeyDB__format_timestampTo edit these changes
git checkout codeflash/optimize-ValkeyDB._format_timestamp-mhl3c50mand push.