Web使用profile来分析慢sql 有一个查询比较慢的sql语句,用了子查询,大概需要0.8秒左右,这个消耗时间比较长,严重影响了性能,所以需要进行优化。单独查询单表或者子查询记录都很快, 开启profile mysql> sh… Web很多人懂r语言,写出来的代码速度非常慢,特别是有些人老是喜欢写循环,我想说的是r语言恨透了循环。 毕竟不是每个人都会用Rcpp写代码的; 目前主流的DeepLearning的包都没有相关的R package,而python通吃;R现在只有一个明星产品mxnet,h2o勉强算1/4;
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