楼主可能把这个方法 apply 到他的个人数据所在目录了 -- Justin Wong On Fri, May 6, 2016, at 18:01, Wang Shanker wrote: > 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，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]> >>> *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]> >>> *抄送：*"tuna-general"<tuna- >>> [email protected]>,"ustc_lug"<[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 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 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 >>> >>--- >>> >>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]. >>> >>For more options, visit https://groups.google.com/d/optout. >>> > >>> >-- >>> >Ray >>> >http://maskray.me[1] >>> >>> -- >>> >>> --- >>> 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. >> >> -- >> >> --- >> 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. > > > -- > > --- > 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. > > Email had 1 attachment:
> * smime.p7s 6k (application/pkcs7-signature) Links: 1. 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]. To post to this group, send email to [email protected]. For more options, visit https://groups.google.com/d/optout.
