fix: gzip trace uploads at level 1 by mikasenghaas · Pull Request #1129 · PrimeIntellect-ai/prime

mikasenghaas · 2026-10-29T22:16:45Z

Summary

Trace uploads gzip at level 1 instead of the default level 9 (GZIP_LEVEL in prime_traces.core.client, used by the sync and async clients).
The upload thread was CPU-bound on compression. With a fast producer, the prime_runs upload queue filled and dropped episodes after its 5 s put timeout.

Verification

One agentic episode: 100 turns, 100k tokens, 2.17 MB upload body.

Compression	Time	Ratio
gzip 9 (before)	71 ms	4.63
gzip 6	42 ms	4.61
gzip 3	16 ms	4.25
gzip 1 (after)	8 ms	4.09

Uploader cost per episode (TracesSink.write through a fake endpoint that gzips like the client): 78 ms before, 16 ms after.

prime-rl monitor load test (PrimeIntellect-ai/prime-rl#4317), 1000 such episodes logged as fast as possible through PrimeMonitor:

	Before	After
Episodes delivered	993 / 1000 (7 dropped: "Upload queue full after 5.0s")	1000 / 1000
Wall time	77 s	12 s

uv run pytest tests/ in packages/prime-traces: 183 passed.

🤖 Generated with Claude Code

Note

Low Risk
Transport-only gzip tuning with no change to content addressing or auth; slightly larger uploads in exchange for faster client-side compression.

Overview
Trace upload bodies are now gzipped at level 1 instead of Python’s default level 9, via a shared GZIP_LEVEL constant in client.py used by both sync and async upload_batch paths (still with mtime=0 for reproducible retries).

This targets upload throughput: compression was CPU-bound and could back up fast producers (e.g. upload queue timeouts and dropped episodes). Payload semantics are unchanged—idempotency and limits still apply to the uncompressed JSONL; only transport compression speed and wire size (~slightly larger) differ.

^{Reviewed by Cursor Bugbot for commit fce799d. Bugbot is set up for automated code reviews on this repo. Configure here.}

The upload thread spent ~70 ms of its ~78 ms per 2 MB episode in gzip at the default level 9, so it fell behind a fast producer and the upload queue dropped episodes. Level 1 is ~9x faster for ~13% more bytes on the wire. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

chatgpt-codex-connector · 2026-10-29T22:16:59Z

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-29T22:17:46.868290Z	`fce799d`	PR opened

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## Summary Part of the monitors stack: #4228 → #4316 → **#4317** → #4244. Stacked on #4316. - Adds `tests/unit/monitors/test_monitor_load.py`: one test, parametrized over monitor (file, prime, W&B) × episode count (10, 100, 1000). - Each episode is agentic and heavy: 100 turns, 100k tokens, numpy streams as the env-server wire delivers them (about 2 MB per upload). - Interleaved with 2000 metric rows of 200 keys. - The episodes share one trace object. Every monitor serializes each episode separately, so the load is the same at a fraction of the memory. - The test logs through `monitors.log` as the orchestrator does, under the orchestrator's `GarbageCollector` (no automatic full collections). An asyncio ticker measures how late the event loop wakes. - The test checks that everything logged arrives: - **File monitor:** every episode in the trace stream, and steps 1 to 2000 in `metrics.jsonl`. - **Prime monitor:** the real SDK run and uploader threads against fake Prime Traces and platform endpoints. The fake traces endpoint gzips like the real client. - **W&B monitor:** the real SDK in offline mode. W&B takes metrics only. - The test fails when a monitor stalls the loop: p99 lag of 50 ms or more, max lag of 250 ms or more, or one `log()` call of 250 ms or more. - `prime-1000` is an expected failure (strict). The SDK uploader gzips each episode at level 9, about 70 ms here, so 1000 episodes logged at once fill its queue. `log()` then waits for room for up to 5 s on the orchestrator's arrival path, and the SDK drops what stays queued. A TODO in the test tracks the fix; PrimeIntellect-ai/prime#1129 is the first part (gzip level 1). - The test is CPU-only, needs no network and is marked `slow`. CI's unit job runs it (it deselects only `gpu`). It takes about 110 s. ## Verification `pytest -s tests/unit/monitors/test_monitor_load.py` on the dev box, with main's `prime-traces` pin: 8 passed, 1 xfailed. | Monitor | Episodes | Loop lag p99 | Loop lag max | `log()` p99 | `log()` max | |---|---|---|---|---|---| | File | 10 / 100 / 1000 | 3.6 / 3.4 / 4.7 ms | 3.7 / 5.6 / 4.9 ms | 0.1 / 5.0 / 5.3 ms | 7.9 / 9.9 / 7.8 ms | | Prime | 10 / 100 | 5.2 / 7.9 ms | 6.0 / 10.5 ms | 0.4 / 0.4 ms | 10.1 / 15.4 ms | | Prime | 1000 | xfail: 7 of 1000 episodes dropped ("Upload queue full after 5.0s"), one `log()` call blocked 5 s | | | | | W&B (offline) | 10 / 100 / 1000 | 1.6 / 1.3 / 1.1 ms | 6.0 / 1.6 / 1.4 ms | 0.6 / 0.5 / 0.6 ms | 6.1 / 0.8 / 0.8 ms | Without the orchestrator's GC setup, a full collection pauses the loop for 220–260 ms in the 1000-episode cases. 🤖 Generated with [Claude Code](https://claude.com/claude-code)  --- > [!NOTE] > **Low Risk** > Test-only change with no production code paths modified; it exercises existing monitor integrations under load. > > **Overview** > Adds **`tests/unit/monitors/test_monitor_load.py`**, a slow unit test that drives **file**, **Prime**, and **W&B (offline)** monitors through **`monitors.log`** the way the orchestrator does—heavy agentic episodes (up to 1000 × 100 turns / ~100k tokens) interleaved with **2000** wide metric rows, under the orchestrator **`GarbageCollector`** fixture. > > For each monitor × episode count (**10 / 100 / 1000**), it asserts **complete delivery** (trace chunks / fake Prime endpoints / W&B metric steps) and **event-loop responsiveness** (p99 lag **< 50 ms**, max lag and single **`log()`** **< 250 ms**). **Prime @ 1000 episodes** is **`xfail` (strict)** documenting **`prime_runs`** upload-queue backpressure that can block **`log()`** for seconds and drop episodes. > > <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit bb9dbad. Bugbot is set up for automated code reviews on this repo. Configure [here](https://www.cursor.com/dashboard/bugbot).</sup>  --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

kcoopermiller

Approving. Correct on both clients, and the digest and limits stay over uncompressed bytes. On real long traces I measured about 5x faster gzip for about 20% more bytes, which is the right trade for hosted training.

Two follow-ups, not blockers:

The prime-rl load test's fake hard-codes gzip level 9 and never calls the real client, so it can't see this change.
Drops still need checking with a real 1000-episode burst against Prime Traces. The queue and the 5 s blocking put are unchanged.

Ships gzip level 1 (#1129), non-blocking concurrent uploads (#1136) and self-encoded episode uploads (#1140). prime-runs now requires prime-traces>=0.0.12: its traces sink can hand TracesClient encoded lines, which 0.0.11 cannot take. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

mikasenghaas requested review from DamianB-BitFlipper, JannikSt, JohannesHa, akirillo, burnpiro, cabrinha, eexwhyzee, kcoopermiller, kennethnym, mrmoxon and willccbb as code owners October 29, 2026 22:16

mikasenghaas mentioned this pull request Oct 29, 2026

feat: stress test the monitors with agentic episodes PrimeIntellect-ai/prime-rl#4317

Merged

mikasenghaas mentioned this pull request Nov 2, 2026

feat: non-blocking, concurrent run uploads in prime-runs and prime-traces #1136

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kcoopermiller approved these changes Nov 2, 2026

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kcoopermiller merged commit f6ce0c5 into main Nov 2, 2026
27 checks passed

kcoopermiller deleted the fix/traces-gzip-level branch November 2, 2026 18:35

This was referenced Nov 2, 2026

fix: run the monitor load test through the real traces client PrimeIntellect-ai/prime-rl#4364

Closed

fix(prime-runs): stop blocking and dropping on upload bursts #1137

Closed

DamianB-BitFlipper mentioned this pull request Nov 2, 2026

release: cli 0.19.1 and prime-sandboxes 0.5.3 #1143

Merged

kcoopermiller mentioned this pull request Nov 2, 2026

release: prime-traces 0.0.12 and prime-runs 0.1.6 #1146

Merged

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fix: gzip trace uploads at level 1 - #1129

fix: gzip trace uploads at level 1#1129
kcoopermiller merged 1 commit into
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fix/traces-gzip-level

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