build-index renders all 1,418 source characters and 34 target characters as 48x48 greyscale PNGs, one per font that natively contains the character. Fontconfig is queried per-character to avoid brute-force rendering across all 230 fonts (97% reduction: 8,881 targeted renders vs 326,140 brute-force).
Депрессия, нарушения сна, гипертония и сахарный диабет второго типа могут возникать задолго до постановки диагноза болезни Альцгеймера. К такому выводу пришли исследователи, проанализировавшие данные электронных медицинских карт миллионов пациентов. Работа опубликована в Alzheimer’s Research & Therapy (AR&T).
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供需失衡→价格暴涨/暴跌→厂商扩产/减产→新一轮循环。这套“周期铁律”几乎成了半导体行业的常识。
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.