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最新评论
-
siphlina:
课程——基于Python数据分析与机器学习案例实战教程分享网盘 ...
Python机器学习库 -
san_yun:
leibnitz 写道hi,我想知道,无论在92还是94版本, ...
hbase的行锁与多版本并发控制(MVCC) -
leibnitz:
hi,我想知道,无论在92还是94版本,更新时(如Puts)都 ...
hbase的行锁与多版本并发控制(MVCC) -
107x:
不错,谢谢!
Latent Semantic Analysis(LSA/ LSI)算法简介 -
107x:
不错,谢谢!
Python机器学习库
今天发现线上jython load很高,查看jstack,jstat都没有异常情况,本来想通过jmap,结果提示我too many open files,应该是网络链接的问题,发现果然大量close_wait,估计是因为长链接,nginx重启的时候,java这头没有关闭,重启之后搞定。
Too many open files经常在使用linux的时候出现,大多数情况是您的程序没有正常关闭一些资源引起的,所以出现这种情况,请检查io读写,socket通讯等是否正常关闭。
如果检查程序没有问题,那就有可能是linux默认的open files值太小,不能满足当前程序默认值的要求,比如数据库连接池的个数,tomcat请求连接的个数等。。。
查看当前系统open files的默认值,可执行:
[root@pororo script]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 128161 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 800000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 128161 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
如果发现open files项比较小,可以按如下方式更改:
1. 检查/proc/sys/fs/file-max文件来确认最大打开文件数已经被正确设置。
cat /proc/sys/fs/file-max
如果设置值太小,修改文件/etc/sysctl.conf的变量到合适的值。这样会在每次重启之后生效。 如果设置值够大,跳过这一步。
echo 2048 > /proc/sys/fs/file-max
编辑文件/etc/sysctl.conf,插入下行:
-
fs.file-max =
8192
2. 在/etc/security/limits.conf文件中设置最大打开文件数, 下面是一行提示:
#<domain> <type> <item> <value>
添加如下这行:
-
* - nofile
8192
这行设置了每个用户的默认打开文件数为2048。
注意"nofile"项有两个可能的限制措施。就是<type>项下的hard和soft。
要使修改过得最大打开文件数生效,必须对这两种限制进行设定。 如果使用"-"字符设定<type>,
则hard和soft设定会同时被设定。
硬限制表明soft限制中所能设定的最大值。 soft限制指的是当前系统生效的设置值。 hard限制值可以被普通用户降低。但是不能增加。 soft限制不能设置的比hard限制更高。 只有root用户才能够增加hard限制值。
当增加文件限制描述,可以简单的把当前值双倍。 例子如下, 如果你要提高默认值1024, 最好提高到2048, 如果还要继续增加, 就需要设置成4096。
最后用ulimit -a再次查看,open files的值,没什么问题的话,就已经改过来了。
发表评论
-
spring-cloud问题排查
2019-11-18 14:58 540### 问题1报错,应用无法启动 org.springfra ... -
log4j 和slf4j的 类冲突解决
2018-07-14 16:11 20011. 检查 log4j 和slf4j的冲突 pub ... -
HikariPool-1 - Connection is not available, request timed out after
2018-05-07 19:13 6716在开发中遇到 HikariPool-1 - Conn ... -
java.io.StreamCorruptedException: invalid stream header: EFBFBDEF
2018-05-03 16:54 2474Java代码 publi ... -
log4j问题总结-加载配置文件
2014-08-20 16:34 1069今天遇到log4j的log4j.properties没有生效 ... -
一个诡异的类冲突错误排查记录
2014-08-13 10:44 822今天遇到一个问题排查了很久,记录一下。 问题原因,日常环境 ... -
tomcat7.0.26的连接数控制bug的问题排查
2014-04-23 19:51 1717今儿线上一台机器,监控一直在告警, mtophost[CM ... -
tomcat,jboss,jetty访问出现404错误问题记录
2014-04-21 19:51 1711原因是WEB-INF下面缺少jboss-web.xml ... -
记录Hadoop native libraries无法load的问题
2014-04-10 19:45 2314今天遇到一个错误,在本地往Hadoop写文件的时候报了一个错 ... -
Exception性能问题
2014-01-24 22:25 13121.从Exception往上介绍相关结构、代码 ... -
spring加载xml去远程获取dtd验证xml的问题
2014-01-24 11:57 903最近遇到spring 加载xml去远程获取dtd,但外网不 ... -
hbase查询超时导致的错误
2013-12-25 19:53 2718今天上线跑一个hbase程序出现如下错误: org.ap ... -
hbase无法启动问题
2013-12-24 23:53 935今天遇到hbase无法启动,找了很久,才发现可能是data ... -
web.xml配置注意点
2013-12-19 20:29 6461. servlet启动初始化 servlet默认只有访 ... -
Linux服务器Cache占用过多内存导致系统内存不足问题的排查解决
2013-12-17 23:22 3927作者: 大圆那些事 | 文章可以转载,请以超链接形式标明文章 ... -
linger close用法
2013-12-13 14:18 973Linux下tcp连接断开的时候调用close()函数,有 ... -
log4j-over-slf4的log4j Loger加载问题
2013-12-11 00:19 5795log4j-over-slf4是通过定义和log4j同包名 ... -
log4j,slf4j,logback问题总结
2013-12-10 18:12 6548ls4j初始化过程参考:l ... -
maven 小结(打包和单元测试)
2013-12-04 11:53 6901. 如何把一个jar和他依赖的包打包成一个 使用mave ... -
solr load比较高
2013-12-02 09:50 1073最近solr的load比较高,通过jstack查看: 写 ...
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