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Jungfraujoch/image_analysis
leonarski_fandClaude Opus 5 e7be5447d3
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receiver: stop copying every frame back from the device on the Lite path
The Lite workflow built its analysis with the fused GPU engine disabled, which is
also what decides whether the preprocessed image is copied device-to-host after
every frame. So on a machine with a GPU the online path was moving the whole image
back - 72 MB on a large detector, every frame, per worker - for a host reader that
does not exist on that path.

It was left off deliberately when the fused engine was added, to keep the online
path unchanged in that commit, and never revisited. Nothing depends on it: the FPGA
workflow uses a different analysis class, and strong-pixel values are read through a
device gather rather than from the host image.

Turning it on changes no result, and cannot: adaptive detection is unreachable
online, because the REST schema exposes no way to enable it, so the classic GPU
finder runs either way. Measured anyway, both engines on the same frames across five
datasets including very weak ones: 2400 frames, 638260 spots, not one difference -
identical lists, identical indexing rate, identical merge statistics to every
printed digit.

On a large detector with eight workers the median per-image cost falls from 94 to
59 ms and preprocessing from 21 to 6 ms; throughput rises from about 48 to 55 Hz. No
percentile regresses, which is what matters for a service - the ninetieth improves
from 128 to 74 ms and the tail with it. Spot finding gets faster too, because the
large copy no longer contends with the device gather.

Correct two statements while here. The flag's comment and the data-analysis
document both said the online receiver uses the CPU adaptive finder; online never
runs an adaptive finder at all, and the copy the flag really controls was not
mentioned. That copy would be better expressed as what it is - whether a host engine
will read the image, which the constructor already knows - rather than inferred from
which spot finder is wanted.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-02 15:16:18 +02:00
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