这个博客只是删掉了 /usr/src 啊,似乎没啥问题

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王邈
清华大学计算机科学与技术系
电话:+86 130-5186-7712
通信地址:北京市海淀区清华大学紫荆公寓2号楼307A 100084

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Miao Wang
Department of Computer Science and Technology, Tsinghua University
Tel.: +86 130-5186-7712
Add.: Room 307A, No.2 Zijing Building, Tsinghua University, Peking. P.R.C. 
100084

> 在 2016年5月6日,16:41,1391509153 <[email protected]> 写道:
> 
> tuna各位技术大牛们,我是自动化一名小硕,平时较少用linux。今天在组里服务器跑程序时inodes满了,于是Google了一下,按照这个博客的操作http://blog.gdsyzx.edu.cn/sense/?p=2329
>  
> <http://blog.gdsyzx.edu.cn/sense/?p=2329>,现在服务器上好像什么都没有了,求问这种情况我的数据还有救吗?具体怎么恢复你?
>  
> Best Regards,
> Chen 
>  
> 发件人:Justin Wong <[email protected] <mailto:[email protected]>>
> 发送时间:2016-05-04 10:10
> 主题:[tuna-general] Re: [USTC-LUG] 一种减轻 mirrors rsync 副作用的思路
> 收件人:"Ray Song"<[email protected] <mailto:[email protected]>>
> 抄送:"tuna-general"<[email protected] 
> <mailto:[email protected]>>,"ustc_lug"<[email protected] 
> <mailto:[email protected]>>
>  
> 应该是这个逻辑,其实可以把limit_in_bytes放宽松一些,rsync 本身占不了多少内存,但是对cache的消耗非常大。 
>  
> -- 
> Justin Wong 
>  
> On Wed, May 4, 2016, at 00:58, Ray Song wrote: 
> > 似乎是因为 memory.limit_in_bytes 限制物理内存 
> > 在应用程序申请的内存和 buffer cache 总和超过限制的情况下,会把超出的弄到 swap 
> > buffer cache就直接丢弃了? 
> >  
> >  
> >  
> > On 2016-05-04, Justin Wong wrote: 
> > >以前在 ustc 邮件列表看到过 mirrors 磁盘缓存几乎无效的问题,其中一个主要原因是 rsync 一遍就扫一遍磁盘,cache 全废了。 
> > > 
> > >今天看到一个叫 nocache 的工具 https://github.com/Feh/nocache 
> > ><https://github.com/Feh/nocache> 可以禁止某个进程使用 
> > >cache,进而发现除了 nocache 还有一些方案可以考虑。 
> > > 
> > >一个是最暴力的方式是直接使用 cgroup 限制 rsync 的内存。我测了一下,效果拔群 
> > > 
> > >``` 
> > >cgcreate -g memory:cptest 
> > >cgset -r memory.limit_in_bytes=20M cptest  # 创建个 cgroup 并限制内存使用为 20MB 
> > >dd if=/dev/zero of=test bs=1M count=2048   # 创建个2G的文件 
> > >echo 3 > /proc/sys/vm/drop_caches              # 把已有的 cache drop 掉,这时 
> > >free -m 应该看见 cache 的量很小了 
> > > 
> > >cgexec -g memory:cptest cp test test 1         # 在 cgroup 中复制一遍 test 
> > >/nocache/cachestats ./test1                            # 用 nocache 
> > >提供的工具看一下 cache 情况,几乎没有被任何 cache 
> > >> pages in cache: 1175/524288 (0.2%)  [filesize=2097152.0K, pagesize=4K] 
> > > 
> > ># 然后直接跑 cp,再用 cachestats 看一下 
> > >cp test test1 
> > >nocache/cachestats ./test1 
> > >> pages in cache: 524288/524288 (100.0%)  [filesize=2097152.0K, 
> > >> pagesize=4K] 
> > ># 全被 cache 住了 
> > >``` 
> > > 
> > >还有就是 http://insights.oetiker.ch/linux/fadvise.html 
> > ><http://insights.oetiker.ch/linux/fadvise.html> 这个地方提供了一个 rsync 的 
> > >patch,使用 fadvice 让 rsync 尽量不使用 cache。 
> > > 
> > >感觉解决了一个老大难问题啊。 
> > > 
> > >-- 
> > >Justin Wong 
> > > 
> > >--  
> > >来自USTC LUG 
> > >请使用gmail订阅,不要灌水。 
> > >更多信息more info:http://groups.google.com/group/ustc_lug?hl=en?hl=en 
> > ><http://groups.google.com/group/ustc_lug?hl=en?hl=en> 
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> > ><https://groups.google.com/d/optout>. 
> >  
> > --  
> > Ray 
> > http://maskray.me <http://maskray.me/> 
>  
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