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抓取网页内容(爬虫)一些方法介绍 | 刘勇的平凡之路

http://ayonliu.github.io/2018/07/19/some-approaches-to-crawl/

抓取网页内容的一般流程 发HTTP请求 解析请求返回的结果 得到的结果持久化 常用的抓取网页内容的方法和工具命令行 cURL PHP: 原生Client URL 库(cURL) 类库,比如:Requests, Guzzle 爬虫开发框架:phpspider Python 类库,比如:Requests 爬虫开发框架:Scrapy NodeJS curl-request 爬虫开发框架:node

MySQL MyISAM 分区(partition)导致打开文件过多 | 刘勇的平凡之路

http://ayonliu.github.io/myisam-partition-too-many-open-files/#more

问题表现最近公司一个业务环境的数据库,出现无法连接的情况,重启后过几个小时问题又出现。查看报错信息,如下所示:1Out of resources when opening file './xxx.MYD' (Errcode: 24 - Too many open files) 问题很明显:打开文件过多,超过了配置的限制。 问题分析查看 table_open_cache, ope

用测试账户调试Google Ads API | 刘勇的平凡之路

http://ayonliu.github.io/2018/09/14/start-google-ads-api-with-test-accounts/

Developer Token申请生产经理账号(production manager account)后可以申请生产经理开发者令牌(后面称 developer token),developer token不仅可以在正式环境中使用,也可以在测试环境中使用。 创建生产经理帐号 在生产经理帐号中请求开发者令牌(production manager developer token) 请求成功后在 TO

MySQL MyISAM 分区(partition)导致打开文件过多 | 刘勇的平凡之路

http://ayonliu.github.io/2018/07/19/myisam-partition-too-many-open-files/#more

问题表现最近公司一个业务环境的数据库,出现无法连接的情况,重启后过几个小时问题又出现。查看报错信息,如下所示:1Out of resources when opening file './xxx.MYD' (Errcode: 24 - Too many open files) 问题很明显:打开文件过多,超过了配置的限制。 问题分析查看 table_open_cache, ope

利用 XHProf 对 PHP 代码进行性能分析 | 刘勇的平凡之路

http://ayonliu.github.io/2018/11/23/profiling-php-code-with-xhprof/

遇到程序执行速度慢的情况,除了看服务器系统状态、mysql slow log外,还可以对代码进行性能分析来定位问题。最简单常用的办法是代码不同的地方记录日志来分析程序各个节点的执行时间。XHProf可以高效地对php代码进行性能分析。 介绍XHProf 是一个轻量级的分层性能测量分析器的PHP扩展。 可以跟踪调用次数、运行时间、CPU 计算时间和内存开销,展示程序动态调用的路径。XHProf 提供

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