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Add excel-export module: Apache POI 6.0.0 XSSF vs SXSSF under a fixed heap, 1,000,000 rows streamed with StreamingResponseBody, OpenCSV, sheet rolling, temp-file cleanup

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
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asmhatre
2026-10-29 06:18:42 +00:00
co-authored by Claude Sonnet 5.5
parent bded24d929
commit 9b1da079c6
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excel-export/output/05-xssf-sweep.txt
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# XSSF under a fixed 512 MB heap: rows until it dies
# openjdk version "25.0.5" 2026-10-20 LTS | 2 vCPU | 8027 MB RAM
# indicative numbers from a shared sandbox, one run per line; see README
XSSF /export/xssf?rows=10000 Xmx=512m http=200 curl=0 bytes=576961 10.1s | peak used heap 135 MB | max after GC 112 MB | 18 GC pauses, longest 495 ms | peak RSS 397 MB | temp dir peak 0 MB, files left 0 | OOM=no
XSSF /export/xssf?rows=25000 Xmx=512m http=200 curl=0 bytes=1430086 13.8s | peak used heap 307 MB | max after GC 255 MB | 18 GC pauses, longest 327 ms | peak RSS 671 MB | temp dir peak 0 MB, files left 0 | OOM=no
XSSF /export/xssf?rows=50000 Xmx=512m http=200 curl=0 bytes=2851566 14.3s | peak used heap 494 MB | max after GC 474 MB | 26 GC pauses, longest 315 ms | peak RSS 674 MB | temp dir peak 0 MB, files left 0 | OOM=no
XSSF /export/xssf?rows=100000 Xmx=512m http=500 curl=0 bytes=107 68.3s | peak used heap - MB | max after GC 512 MB | 106 GC pauses, longest 2412 ms | peak RSS 667 MB | temp dir peak 0 MB, files left 0 | OOM=YES | body: {"timestamp":"2026-10-29T06:03:25.226Z","status":500,"error":"Internal Server Error","path":"/export/xssf"}