zip: bake charts straight out of an archive - #57
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Unzipping NOAA's All_ENCs.zip first costs 2.0 GiB of disk that is dead the moment the import ends. Instead the central directory is walked once and each cell is inflated when its turn comes, baked, and freed: 7,224 charts in about 12 minutes, never holding more than a worker's cells. What the engine can only read by path streams to disk at its own size, not twice it. tile57_zip_list, tile57_bake_zip_charts, tile57_bake_zip_rasters, tile57_zip_extract, and `tile57 bake archive.zip`. The bake now also writes the text and pictures a cell references beside its archive, from either source, when the chart has a directory of its own. Collecting them was the CLI's job, so nothing baked through the C ABI carried them and a pick report could name a caution note it could not show.
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Unzipping NOAA's All_ENCs.zip first costs 2.0 GiB of disk that is dead the moment the import ends. Instead the central directory is walked once and each cell is inflated when its turn comes, baked, and freed: 7,224 charts in about 12 minutes, never holding more than a worker's cells. What the engine can only read by path streams to disk at its own size, not twice it.
tile57_zip_list, tile57_bake_zip_charts, tile57_bake_zip_rasters, tile57_zip_extract, and
tile57 bake archive.zip.The bake now also writes the text and pictures a cell references beside its archive, from either source, when the chart has a directory of its own. Collecting them was the CLI's job, so nothing baked through the C ABI carried them and a pick report could name a caution note it could not show.