PHPor 的BlogPHP+Mysql+Nginx+Linux再学习，更上新台阶默认分类再学习，更上新台阶已关闭评论10月 112012学习是一种信仰学习是一种习惯学习是一种乐趣学习是一种能力学习是一种态度Posted by phpor at 上午 9:38排查问题工具默认分类No Responses »9月 292016http://www.cnblogs.com/E-star/p/5460840.htmljstackjstat…Posted by phpor at 下午 9:10JVM 新生代老年代默认分类No Responses »9月 292016http://www.cnblogs.com/E-star/p/5556188.htmlPosted by phpor at 下午 9:02java 虚拟机–新生代与老年代GC默认分类No Responses »9月 292016https://my.oschina.net/sunnywu/blog/332870Posted by phpor at 下午 8:53Java 堆内存 – 老生代 新生代默认分类No Responses »9月 292016http://www.blogjava.net/fancydeepin/archive/2013/09/29/jvm_heep.html关于新生代，老生代，young gc，full gc 解释的简单易懂Posted by phpor at 下午 8:4410 个最好的 PHP 库用于轻松发送HTTP请求 – OPEN资讯默认分类No Responses »9月 282016http://m.open-open.com/m/news/view/a66be8Posted by phpor at 上午 9:27独家许可与独占许可默认分类No Responses »9月 282016独家许可: 被许可方和许可方都可以使用，不能再有其它方使用独占许可: 只有被许可方可以使用，许可方自己不能使用Posted by phpor at 上午 9:20文件操作监控Linux & UnixNo Responses »9月 232016缘起话说strace是运维的利器，可以跟踪进程的所有的系统调用；有一天，运维小明发现tmp目录下意外产生了大量图片文件，并且在不断增多，但是不知道是哪个进程写的，所以更不知道是哪个应用写的，这时候strace无能为力了（其实可以strace所有可以的进程的，有些麻烦）曾记否，inotify是可以监控文件（目录）的访问（不仅仅是变化）的，其输出类似：嗯，没有进程信息，咋办？还有一个神奇： systemtap参考文档： https://sourceware.org/systemtap/SystemTap_Beginners_Guide.pdf这里的iotime.stp 可以用来监控文件的变化，而且包含进程信息：#! /usr/bin/env stap/** Copyright (C) 2006-2007 Red Hat Inc.** This copyrighted material is made available to anyone wishing to use,* modify, copy, or redistribute it subject to the terms and conditions* of the GNU General Public License v.2.** You should have received a copy of the GNU General Public License* along with this program. If not, see <http://www.gnu.org/licenses/>.** Print out the amount of time spent in the read and write systemcall* when each file opened by the process is closed. Note that the systemtap* script needs to be running before the open operations occur for* the script to record data.** This script could be used to to find out which files are slow to load* on a machine. e.g.** stap iotime.stp -c 'firefox'** Output format is:* timestamp pid (executabable) info_type path ...** 200283135 2573 (cupsd) access /etc/printcap read: 0 write: 7063* 200283143 2573 (cupsd) iotime /etc/printcap time: 69**/global startglobal time_iofunction timestamp:long() { return gettimeofday_us() - start }function proc:string() { return sprintf("%d (%s)", pid(), execname()) }probe begin { start = gettimeofday_us() }global filehandles, fileread, filewriteprobe syscall.open.return {filename = user_string($filename)if ($return != -1) {filehandles[pid(), $return] = filename} else {printf("%d %s access %s fail\n", timestamp(), proc(), filename)}}probe syscall.read.return {p = pid()fd = $fdbytes = $returntime = gettimeofday_us() - @entry(gettimeofday_us())if (bytes > 0)fileread[p, fd] += bytestime_io[p, fd] <<< time}probe syscall.write.return {p = pid()fd = $fdbytes = $returntime = gettimeofday_us() - @entry(gettimeofday_us())if (bytes > 0)filewrite[p, fd] += bytes