这个博客只是删掉了 /usr/src 啊,似乎没啥问题 本邮件具有数字签名,敬请核对。 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
Please verify the digital signature attached with the e-mail. 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> > > >--- > > >You received this message because you are subscribed to the Google Groups > > >"USTC_LUG" group. > > >To unsubscribe from this group and stop receiving emails from it, send an > > >email to [email protected] > > ><mailto:[email protected]>. > > >For more options, visit https://groups.google.com/d/optout > > ><https://groups.google.com/d/optout>. > > > > -- > > Ray > > http://maskray.me <http://maskray.me/> > > -- > > --- > You received this message because you are subscribed to the Google Groups > "TUNA 主邮件列表" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > -- > > --- > You received this message because you are subscribed to the Google Groups > "TUNA 主邮件列表" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- --- You received this message because you are subscribed to the Google Groups "TUNA 主邮件列表" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. For more options, visit https://groups.google.com/d/optout.
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