Optimize SFTP download performance with background prefetching and range parallelism - #36
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… and parallel ranges - Implement asynchronous background prefetching in `DCFSSFTPBufferedFile` using `asyncio.Queue` so SFTP read loops serve chunks directly from RAM without sequential RTT delays. - Lower `is_big_file` threshold in `dcfs/utils/others.py` to 2MB to trigger `download_file_parallel` Range requests for standard 8MB Discord file parts. - Increase default `download_max_concurrent_parts` from 3 to 6 in `dcfs/config.py` and `dcfs/core/client.py`. - Add unit tests for SFTP prefetching error propagation and lifecycle cleanup. Co-authored-by: VulcanoSoftware <113239901+VulcanoSoftware@users.noreply.github.com>
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… and parallel ranges - Implement asynchronous background prefetching in `DCFSSFTPBufferedFile` using `asyncio.Queue` so SFTP read loops serve chunks directly from RAM without sequential RTT delays. - Lower `is_big_file` threshold in `dcfs/utils/others.py` to 2MB to trigger `download_file_parallel` Range requests for standard 8MB Discord file parts. - Increase default `download_max_concurrent_parts` from 3 to 6 in `dcfs/config.py` and `dcfs/core/client.py`. - Add unit tests for SFTP prefetching error propagation and lifecycle cleanup. Co-authored-by: VulcanoSoftware <113239901+VulcanoSoftware@users.noreply.github.com>
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This change significantly improves SFTP download speeds:
DCFSSFTPBufferedFilevia a background worker pushing stream chunks into a boundedasyncio.Queue. Subsequent SFTPread()calls are served directly from RAM without waiting on sequential network round-trips.is_big_filethreshold to 2MB so standard 8MB Discord parts trigger parallel HTTP Range downloads from Discord CDN.download_max_concurrent_partsto 6 for higher part concurrency during multi-part file downloads.tests/test_sftp_handler.pyand updated config/utility tests.PR created automatically by Jules for task 10218746665379169542 started by @VulcanoSoftware