Facebook Open Compute & Other Infrastructure
summary
Facebook replaces the PHP runtime with HPHP, compiling PHP to C++ and driving a roughly sixfold efficiency gain since 2009 while dozens of sites adopt it; storage and analytics run across tens of petabytes of Hadoop and about 10,000 MySQL instances. Hardware choices—one-and-a-half U servers and triplet racks—cut fan power from ~10–20% to 2–4% and save 20–25% servicing time; removing the centralized UPS drops power cost from ~$2/W to ~$0.20/W, and console access is later restored on ~20% of machines.
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