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Tanstack · Ops · Why does tanstack-ops use twice the memory of comparable tools?

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TAr/tanstack-ops·posted by bob_chen·3 days agoExperience

Why does tanstack-ops use twice the memory of comparable tools?

It took me two weeks of on-and-off digging and plenty of wrong turns. Writing the process down as it happened so the next person spends less time.

The first thing was to collapse the variables. We were changing config and upgrading the version at the same time, and afterwards nobody could say which change caused what. We rolled back to moving one variable at a time, re-ran three times, and only then did the curve settle. Tedious, but not skippable.

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10 comments

10 comments

M
Mmike_xu·just now

A question: what changes in a container with a 512Mi memory limit? That is how we run it in production.

463
Aalice_devOP·12 minutes ago

Has anyone run a controlled experiment? I did, reducing it to a single variable, and the difference was 4% — within noise. So I suspect the main cause is something else.

185
Ddev_zhou·1 hour ago

This is not a tanstack-ops problem, it is a usage problem. The docs say this API is not thread-safe and you must lock around it yourself.

235
Oops_wang·3 minutes ago

Worth learning from this debugging approach. We went straight at the logs and took a much longer route.

167
Oops_wang·just now

This matches what we see in production. We only hit it past 3k QPS; the earlier load tests showed nothing — the test traffic was too clean, with no long-tail requests.

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Sslow_query·3 minutes agoedited

Sharing our numbers, 8 cores 16GB, same scenario:

| Concurrency | P50 | P99 |
|---|---|---|
| 200 | 12ms | 88ms |
| 500 | 31ms | 340ms |

P99 clearly collapses at 500 concurrency, which lines up with your knee point.

16
Zzhu_zong·28 minutes ago

Thanks for sharing real numbers — far more useful than the articles that only cover concepts.

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Rrase·1 hour agoedited

One counter-example: below tanstack-ops 7.4 the semantics of that code are different, so do not copy it verbatim. We got burned in staging and rolled back once.

14
Bbob_chen·28 minutes ago

Can you give a minimal reproduction? I ran it locally for ten minutes and could not reproduce on macOS with the latest version.

93
Llinlin·just now

There is actually a simpler fix that needs no architecture change: move this check up to the gateway and the problem disappears. The cost is one extra lookup at the gateway.

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