Error Too Many Open Files
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communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings java too many open files and policies of this site About Us Learn more about Stack Overflow storm too many open files the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges cassandra too many open files Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: warning too many open files Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Too many open files - how to find the culprit up vote 31 down vote favorite 12 When running tail -f filename, I got the following message: tail: inotify cannot be used, reverting to polling: Too many open files Is that a potential
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problem? How do I diagnose what's responsible for all the open files? I have a list of suspect processes, but if they don't turn out to be the culprits, instructions that don't rely on knowing which process to check would be useful. filesystem share|improve this question asked Aug 28 '12 at 3:07 Andrew Grimm 4192619 1 Have you increased the number of file descriptors available via ulimit? –Ignacio Vazquez-Abrams Aug 28 '12 at 3:09 1 @IgnacioVazquez-Abrams That may be helpful to other users, but to me it'd feel like treating the symptom rather than the disease. –Andrew Grimm Aug 28 '12 at 3:13 While you're not wrong, sometimes apps have legitimate reasons for having many files open. –Ignacio Vazquez-Abrams Aug 28 '12 at 3:14 add a comment| 2 Answers 2 active oldest votes up vote 28 down vote accepted You can use lsof to understand who's opening so many files. Usually it's a (web)server that opens so many files, but lsof will surely help you identify the cause. Once you understand who's the bad guy you can kill the process
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company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions error too many open files transmission Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million too many open files error linux programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Socket accept - “Too many open files” up vote 34 down vote favorite 20 I am working on a school http://askubuntu.com/questions/181215/too-many-open-files-how-to-find-the-culprit project where I had to write a multi-threaded server, and now I am comparing it to apache by running some tests against it. I am using autobench to help with that, but after I run a few tests, or if I give it too high of a rate (around 600+) to make the connections, I get a "Too many open files" error. After I am done with dealing with request, I always do http://stackoverflow.com/questions/880557/socket-accept-too-many-open-files a close() on the socket. I have tried to use the shutdown() function as well, but nothing seems to help. Any way around this? c sockets share|improve this question edited Jul 19 '13 at 15:06 Yu Hao 84.3k18116177 asked May 19 '09 at 1:15 Scott 1,01731328 add a comment| 9 Answers 9 active oldest votes up vote 35 down vote accepted There are multiple places where Linux can have limits on the number of file descriptors you are allowed to open. You can check the following: cat /proc/sys/fs/file-max That will give you the system wide limits of file descriptors. On the shell level, this will tell you your personal limit: ulimit -n This can be changed in /etc/security/limits.conf - it's the nofile param. However, if you're closing your sockets correctly, you shouldn't receive this unless you're opening a lot of simulataneous connections. It sounds like something is preventing your sockets from being closed appropriately. I would verify that they are being handled properly. share|improve this answer answered May 19 '09 at 1:20 Reed Copsey 395k377941117 I edit /etc/security/limits.conf with: –linjunhalida Jul 21 '11 at 7:39 username hard nofile 20000 –linjunhalida Jul 21 '11 at 7:39 2 and how to apply it without restart? –linjunhalida Jul 21 '11 at 7:40 This doesn'
too; ProblemDeterminationDocument; JCC was appserver app server Technote (troubleshooting) Problem(Abstract) This technote explains how to debug the "Too many open files" error message on Microsoft Windows, AIX, Linux http://www.ibm.com/support/docview.wss?uid=swg21067352 and Solaris operating systems. Symptom The following messages could be displayed when the process has exhausted the file handle limit: java.io.IOException: Too many open files [3/14/15 9:26:53:589 EDT] 14142136 prefs W Could not lock User http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/ prefs. Unix error code 24. New sockets/file descriptors can not be opened after the limit has been reached. Cause System configuration limitation. When the "Too Many Open Files" error message is written to the too many logs, it indicates that all available file handles for the process have been used (this includes sockets as well). In a majority of cases, this is the result of file handles being leaked by some part of the application. This technote explains how to collect output that identifies what file handles are in use at the time of the error condition. Resolving the problem Determine Ulimits On UNIX too many open and Linux operating systems, the ulimit for the number of file handles can be configured, and it is usually set too low by default. Increasing this ulimit to 8000 is usually sufficient for normal runtime, but this depends on your applications and your file/socket usage. Additionally, file descriptor leaks can still occur even with a high value. Display the current soft limit: ulimit -Sn Display the current hard limit: ulimit -Hn Or capture a Javacore, the limit will be listed in that file under the name NOFILE: kill -3 PID Please see the following document if you would like more information on where you can edit ulimits: Guidelines for setting ulimits (WebSphere Application Server) http://www.IBM.com/support/docview.wss?rs=180&uid=swg21469413 Operating Systems Windows By default, Windows does not ship with a tool to debug this type of problem. Instead Microsoft provides a tool that you can download called Process Explorer. This tool identifies the open handles/files associated with the Java™ process (but usually not sockets opened by the Winsock component) and determines which handles are still opened. These handles result in the "Too many open files" error message. To display the handles, click on the Gear Icon in the toolbar (or press CTRL+ H to toggle the handles
16, 2015 in BASH Shell, CentOS, Debian / Ubuntu, File system, Linux, RedHat and Friends, Suse, Ubuntu LinuxHow do I increase the maximum number of open files under CentOS Linux? How do I open more file descriptors under Linux? The ulimit command provides control over the resources available to the shell and/or to processes started by it, on systems that allow such control. The maximum number of open file descriptors displayed with following command (login as the root user).
Command To List Number Of Open File DescriptorsUse the following command command to display maximum number of open file descriptors: cat /proc/sys/fs/file-max Output:7500075000 files normal user can have open in single login session. To see the hard and soft values, issue the command as follows: # ulimit -Hn# ulimit -Sn To see the hard and soft values for httpd or oracle user, issue the command as follows: # su - username In this example, su to oracle user, enter: # su - oracle
$ ulimit -Hn
$ ulimit -SnSystem-wide File Descriptors (FD) LimitsThe number of concurrently open file descriptors throughout the system can be changed via /etc/sysctl.conf file under Linux operating systems.The Number Of Maximum Files Was Reached, How Do I Fix This Problem?Many application such as Oracle database or Apache web server needs this range quite higher. So you can increase the maximum number of open files by setting a new value in kernel variable /proc/sys/fs/file-max as follows (login as the root): # sysctl -w fs.file-max=100000 Above command forces the limit to 100000 files. You need to edit /etc/sysctl.conf file and put following line so that after reboot the setting will remain as it is: # vi /etc/sysctl.conf Append a config directive as follows: fs.file-max = 100000 Save and close the file. Users need to log out and log back in again to changes take effect or just type the following command: # sysctl -p Verify your settings with command: # cat /proc/sys/fs/file-max OR # sysctl fs.file-maxUser Level FD LimitsThe above procedure sets system-wide file descriptors (FD) limits. However, you can limit httpd (or any other users) user to specific limits by editing /etc/security/limits.conf file, enter: # vi /etc/security/limits.conf Set httpd user soft and hard limits as follows: httpd soft nofile 4096
httpd hard nofile 10240 Save and close the file. T