高能物理計(jì)算發(fā)展動(dòng)態(tài)-資料下載頁
2025-08-01 14:36本頁面
【正文】 deployment ? Measurements from – 34 monitors in 14 countries – Over 600 remote hosts – Over 72 countries – Over 3300 monitorremote site pairs – Measurements go back to Jan95 – Reports on RTT, loss, reachability, jitter, reorders, duplicates … ? Countries monitored – Contain 78% of world population – 99% of online users of Inter Monitoring Sites Remote Sites History Round Trip Time (RTT) ? Improving by 1020% year ? More direct paths ? Replacing satellites with land lines – Satellite ~550ms ? Faster lines amp。 work equipment ? Lower limit speed of light in fiber Typical lower limit today ~ distance/( * ( * c)) Speed of light in fiber History – one Research ISP 100% growth in traffic/yr for last 12 years Continuous upgrades Increase packet size (bulk throughput apps) CERN計(jì)算模式 1)How the Atlas group people use puters for their jobs, do they need .? Most people use the Linux cluster called lxplus (not just Atlas, all experiments do, and Theory dept. also) 2)Does Atlas store Data on ? or just in Atlas group office? Yes, the large Monte Carlo files are stored in part at the Cern puting center （ look at the Atlas web page for Grid data storage, much data is also at other sites） 3)What is the main work for .? They don39。t specifically work for Atlas, they just make sure that the infrastructure works for all. Computing Center39。s is giving technical support to ATLAS, help them build and upgrade their cluster. BES實(shí)驗(yàn)的數(shù)據(jù)處理 ? 高亮度對撞與較高分辨率探測記錄； ? 計(jì)算機(jī)數(shù)字化在線取數(shù)； ? 大數(shù)據(jù)量的離線處理； ? 刻度 —提取參數(shù) ? 重建 —計(jì)算物理量 ? 物理分析 —事例統(tǒng)計(jì) ? Monte Carlo 模擬配合 ? 探測器設(shè)計(jì)模擬計(jì)算 ? 物理事例模擬及分析 BESIII數(shù)據(jù)處理 ? 100倍于現(xiàn)在的實(shí)驗(yàn)； ? 在線取數(shù)的實(shí)時(shí)性，要求存帶； ? 離線處理的及時(shí)性，要求寬帶傳輸； GB ? 刻度 —Farm1 + Robot ? 重建 —Farm2 + Robot ? 物理 —Farm3 + SAN ? 合作 —Inter + GRID
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