I’ve been lucky enough to attend six summer Olympic Games, but I’d never before photographed a Winter Olympics. They’ve always been too far away and the UK has never been a major snowsport country, which has limited their news appeal. This time it was different. With Team GB anticipating a record medal haul and the Games staged in northern Italy, I headed off with nervous excitement, lured by the promise of fast action sports occurring amid beautiful snowy vistas. I covered ski jumping, big air, ice hockey, biathlon, curling and much more. A lot of it was alien to me but it was very enjoyable. There were new rules to learn, new challenges to face – I’ve certainly never had to wear sharp crampons at a football match.
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Git packfiles use delta compression, storing only the diff when a 10MB file changes by one line, while the objects table stores each version in full. A file modified 100 times takes about 1GB in Postgres versus maybe 50MB in a packfile. Postgres does TOAST and compress large values, but that’s compressing individual objects in isolation, not delta-compressing across versions the way packfiles do, so the storage overhead is real. A delta-compression layer that periodically repacks objects within Postgres, or offloads large blobs to S3 the way LFS does, is a natural next step. For most repositories it still won’t matter since the median repo is small and disk is cheap, and GitHub’s Spokes system made a similar trade-off years ago, storing three full uncompressed copies of every repository across data centres because redundancy and operational simplicity beat storage efficiency even at hundreds of exabytes.
如果你直接把物体放进去，可能会发现一片漆黑。为什么？因为在 3D 世界里，除了特殊的“基础材质”，大多数材质都需要光才能被看见。