在开发的时候遇见这个问题，总是提示Too many open files。日志如下：
Errors occurred during the build.
Errors running builder 'Android Pre Compiler' on project 'binkery-demo'.
Errors occurred while refreshing resources with the local file system.
Could not write metadata for '/home/binkery/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/binkery-demo/.indexes/properties.index'.
/home/binkery/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/binkery-demo/.indexes/properties.index (Too many open files)
Errors occurred while refreshing resources with the local file system.
Could not write metadata for '/home/binkery/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/binkery-demo/.indexes/properties.index'.
/home/binkery/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/binkery-demo/.indexes/properties.index (Too many open files)
在网上找了一下，貌似跟ubuntu下个配置有关。老外是这么说的：
Eclipse – “Too many open files” Problem If your OS is Linux and you are using Eclipse, you might possibly see the following error messages or similar after installing lots of plug-ins in Eclipse. In my case, it usually happened after installing TPTP (I’m using Ubuntu Linux 9.04 Jaunty Jackalope Desktop 64bit by the way).
打开命令行终端，
$lsof | wc -l
这个命令能打印出当前打开的文件数目。我的打印出来是5000+
$lsof | grep eclipse | wc -l
这个命令打印出eclipse打开的文件数目。我的打印出来是有500+。
$ ulimit -a
core file size (blocks, -c) #
data seg size (kbytes, -d) #
scheduling priority (-e) #
file size (blocks, -f) #
pending signals (-i) #
max locked memory (kbytes, -l) #
max memory size (kbytes, -m) #
open files (-n) 1024
pipe size (512 bytes, -p) #
POSIX message queues (bytes, -q) #
real-time priority (-r) #
stack size (kbytes, -s) #
cpu time (seconds, -t) #
max user processes (-u) #
virtual memory (kbytes, -v) #
file locks (-x) #
这个命令能打印一些数据出来，具体啥意思不打了解。 或者
$ulimit -n
直接打印出来一个1024。这个1024应该是你当前电脑上的配置的数目。 这个时候需要修改这个数目，让它大一点。
老外这么说的：
To change it, open the file /etc/security/limits.conf and put a greater number than 1024 depending on the number of open files you checked with lsof | wc -l just before.
$ gksudo gedit /etc/security/limits.conf
add these lines
* soft nofile 9216
* hard nofile 9216
把这两行加进去。注意要有前面的*号。 然后注销一下重新登录进来看一下
$ulimit -n
这个时候应该是9216了。
到目前为止，使用这个方法很好，没有再出现那个烦人的error提示了。持续观望中。
新学了几个终端命令。
特别是gksudo，一开始我以为是老外打错了，或者复制带过来的，我用sudo命令去做，没有任何提示错误，但是那个值就是一直修改不了，后来改用gksudo，ok了。
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