perf: defer API run creation until first emission upload (3/4)#1253
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This was referenced Jun 21, 2026
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #1253 +/- ##
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Coverage 89.61% 89.62%
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Files 48 48
Lines 4757 4761 +4
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+ Hits 4263 4267 +4
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Add process-level hardware setup cache, probe result caching, platform-aware CPU backend selection, and parallel CPU/GPU setup for faster repeat runs. Co-authored-by: Cursor <cursoragent@cursor.com>
Import GPU/CPU probe modules before clearing caches so lru_cache state does not leak across tests in the full suite. Co-authored-by: Cursor <cursoragent@cursor.com>
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Cover scalar GPU id normalization, defensive error paths, power gadget setup, and fallback tracking branches missing from the PR patch report. Co-authored-by: Cursor <cursoragent@cursor.com>
Skip POST /runs during tracker startup and create the run lazily on the first live_out/out call when an experiment id is configured. Co-authored-by: Cursor <cursoragent@cursor.com>
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June 29, 2026 12:10
inimaz
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Nice, this will make it much faster the first setup of the client. Thanks @davidberenstein1957 !
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Summary
Part 3/4 of the tracker performance stack. Depends on #1251 → #1252.
cc @inimaz — small, isolated API write-path change from the #1246 split.
Defers the
POST /runsAPI call until the first emission is actually uploaded, so online trackers with API output enabled no longer block on run creation during startup:CodeCarbonAPIOutputusescreate_run_automatically=False_ensure_api_run()creates the run lazily on firstlive_out/outcallBenchmarks (measured locally, offline Mac ARM, 2026-06-21)
Mocked geo/cloud/API network; measures
EmissionsTracker(save_to_api=True)coldstart():start()avgPOST /runsat startup__init__/ warm lifecycleStack
CI / quality
pre-commit runon all changed files — passedpytest tests/output_methods/test_http.py— 9 passedTest plan
Replaces
Split from #1246.