中文网好像不好找......解决了这个问题后电脑速度明显的快多了（英文是必须要耐心的看下去的）

转载于http://confluence.jetbrains.com/display/IDEADEV/Inotify+Watches+Limit

Added by
Roman Shevchenko, last edited by
Konstantin Bulenkov on Jun 30, 2013 (view change)

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For an intelligent IDE it is essential to be in the know about any external changes in files it working with - e.g. changes made by VCS, or build tools, or code generators etc. For that reason, IntelliJ platform spins background process to monitor such changes.
The method it uses is platform-specific; and on Linux it is
Inotify facility.

Inotify requires a "watch handle" to be set for each directory in the project. Unfortunately, the default limit of watch handles may not be enough for reasonably sized projects, and reaching the limit will force IntelliJ platform to fall back to recursive
scans of directory trees.

To prevent this situation it is recommended to increase the watches limit (to, say, 512K). You can do it by adding following line to the
/etc/sysctl.conf file:

Then run this command to apply the change:

And don't forget to restart your IDE.

Note: the watches limit is per-account setting. If there are other programs running under the same account which also uses Inotify the limit should be raised high enough to suite needs of all of them.

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19 Comments

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Dec 16, 2010

James Treacy

Hi - any idea where I'd find sysctl.conf in IntelliJ 10 (Community Edition) installed on Ubuntu?

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Dec 16, 2010

Roman Shevchenko

/etc/sysctl.conf

It is a system file, not an IDEA one.

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Dec 16, 2010

James Treacy

Whoops! Thank you


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Jan 19, 2011

smarks@digisolutions.com

FYI: this solution does not seem to work under CentOS not sure what the correct fix is at this point.

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Jan 19, 2011

smarks@digisolutions.com

OK, should have looked first, here's the procedure for CentoOS

To the end of /etc/sysctl.conf add the line: fs.inotify.max_user_watches = 5242881
Apply the changes with the command sysctl -p

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Jan 19, 2011

Roman Shevchenko

Sorry, but what's the difference? You just increased the limit to over 5 million (5,242,881 instead of proposed 524,288). Is there any point to set the limit that high?

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Nov 03, 2011

Alex Andrienko

Considering the following situation: 10 developers work on the working copies, mounted via sshfs from a single server. Don't ask me why, it's not my call.

Should I adjust this settings on developers' working stations and also on server with the value 10 times as big?

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Nov 03, 2011

Roman Shevchenko

Though I've never tried it over sshfs but I'm pretty sure it won't work. Network-mounted FS don't produce file change notifications.

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Nov 08, 2011

Arik Kfir

On Fedora, and I suspect other Linux OSes too, the correct solution is not to edit /etc/sysctl.conf but rather to create a new file in /etc/sysctl.d such as "/etc/sysctl.d/idea.conf" and place the config line there.

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Nov 08, 2011

Roman Shevchenko

Sysctl.d is more for packages. It's ok to place user-configured settings in sysctl.conf.

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Nov 08, 2011

Alex Andrienko

Speaking of packages, it would be nice to have one.


Meanwhile I'd also put the change into a separate file under /etc/sysctl.d .

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Nov 08, 2011

Roman Shevchenko

http://youtrack.jetbrains.net/issue/IDEA-22750

I'm not telling not to do, just saying sysctl.conf is quite a correct way too.

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Sep 17, 2013

Rajiv

In ubuntu 12+, you needn't edit the sysctl.conf file. Just do

sudo sysctl fs.inotify.max_user_watches=xxxxx

This updates the entry in /proc/sys/fs/inotify/max_user_watches but does not seem to modify the /etc/sysctl.conf file.

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Sep 18, 2013

Roman Shevchenko

Right, but it will last only until reboot.

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Sep 19, 2013

Rajiv

Yup. True that. Modified sysctl.conf (like I should have in the first place!) and it worked like a charm.

Thanks Roman.

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Oct 15, 2013

JRo

I don't understand why it is necessary to set up this limit so high. And it not a good thing to give such a hight value as the must-do in a wiki !

I f you google a little bit, you'll find that the memory used by inotify is 540 * nb of watches on 32bit systems and so 1080 on 64bit ones. 524288 * 1080 = 566 231 040 => 540MiB only for that !

Stackoverflow suggest to count your files to give you a closer idae of how much you really need. I done wih only 92000 max watches on my 8Go source dir .

http://stackoverflow.com/questions/535768/what-is-a-reasonable-amount-of-inotify-watches-with-linux

http://askubuntu.com/questions/154255/how-can-i-tell-if-i-am-out-of-inotify-watches

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Oct 21, 2013

Roman Shevchenko

The links provided clearly say that unused watches does not take any memory.

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Nov 11, 2013

Jay Lee

For Arch Linux users, this solution won't work after version 207 according to
this news. But the news also give a work around.

Following for the lazy people:

# vi /etc/sysctl.d/99-sysctl.conf

Then add the line mentioned above:

fs.inotify.max_user_watches = 524288

Or you can just:

# echo "fs.inotify.max_user_watches = 524288" >> /etc/sysctl.d/99-sysctl.conf

Don't forget:

# sysctl -p

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Jan 21, 2014

Claus Conrad

While running sysctl -p on Arch Linux I got:

sysctl: cannot open "/etc/sysctl.conf": No such file or directory

The correct command seems to be:

# sysctl -p /etc/sysctl.d/99-sysctl.conf