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.
与两年前不同，这辆无人驾驶出租车的驾驶座上，不再有监督员。驾驶过程中，方向盘自顾自地旋转，礼让行人，保持车距，转弯减速让行，文明得令人汗颜。稍有不太便捷之处，则是在落客时，车辆只能生硬地停靠在地图上约定的地点，乘客难以跟其“商量”能否停靠在更方便的落客区。
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公式： f(x)=x⋅Φ(x)≈0.5x(1+tanh[2/π(x+0.044715x3)])
一场关乎企业命运的改革，正式拉开序幕。
记者在某电商平台检索发现，有商家提供解除家长管控、远程安装游戏及短视频应用等服务，收费根据不同型号而定，支持远程操作或邮寄设备处理。其中，远程破解收费最低仅需30元。