2016年12月9日
xpath
摘要： $x("//ul[@id='s-results-list-atf']//li[@data-asin]/@data-asin") https://www.amazon.com/s/ref=nb_sb_noss?url=node%3D13896617011&field-keywords=huawei < 阅读全文
posted @ 2016-12-09 16:23 papering 阅读(299) 评论(0) 推荐(0)
Static Random-Access Memory Dynamic Random-Access Memory
摘要： COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION RAM technology is divided into two technologies: dynamic and static. A 阅读全文
posted @ 2016-12-09 13:27 papering 阅读(323) 评论(0) 推荐(0)
zero cycles - 1 to 30 cycles - tens of millions of cycles
摘要： Computer Systems A Programmer's Perspective Second Edition To this point in our study of systems, we have relied on a simple model of a computer syste 阅读全文
posted @ 2016-12-09 13:12 papering 阅读(234) 评论(0) 推荐(0)
regardless of how many processors are devoted to a parallelized execution of this program
摘要： https://en.wikipedia.org/wiki/Amdah's_law Amdahl's law is often used in parallel computing to predict the theoretical speedup when using multiple proc 阅读全文
posted @ 2016-12-09 12:48 papering 阅读(231) 评论(0) 推荐(0)