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Eclipse will throw the below error when it runs out of memory. It normally occurs on big projects when performing memory-intensive operations, such as building workspace.

An internal error occurred during: "Building workspace".
GC overhead limit exceeded

Memory is allocated via Eclipse‘ configuration file which is executed during Eclipse‘ startup. It is located in its installation directory and named eclipse.ini. The default values are good enough for small projects, but not suffice for the bigger ones.

Below is the file’s content for Eclipse Neon;

-startup
plugins/org.eclipse.equinox.launcher_1.3.200.v20160318-1642.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.400.v20160518-1444
-product
org.eclipse.epp.package.java.product
--launcher.defaultAction
openFile
-showsplash
org.eclipse.platform
--launcher.defaultAction
openFile
--launcher.appendVmargs
-vmargs
-Dosgi.requiredJavaVersion=1.8
-XX:+UseG1GC
-XX:+UseStringDeduplication
-Dosgi.requiredJavaVersion=1.8
-Xms256m
-Xmx1024m

Fixing the problem means allocating more memory for Eclipse. This is done by increasing the values of some parameters in the configuration file. You should only be concerned of the following lines;

-Xms256m
-Xmx1024m

Each lines allocate memory in Megabytes for different aspect of the program, namely the followings;

• Xms
  • Initial memory allocation pool
• Xmx
  • Maximum memory allocation pool for Java Virtual Machine (JVM)

There’s no one-size-fits-all solution for this issue as it depends on how much memory you need versus how much memory you have. You can start by probably doubling the amounts as in the below example and then go from there.

-Xms512m
-Xmx2048m

The changes will take effect after Eclipse is restarted.

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PHP will exit with the following error once it reaches the maximum allowed time for it to execute your scripts;

Fatal error: Maximum execution time of 30 seconds exceeded in yourscript.php

You can avoid this error by increasing the maximum execution time for PHP. This can be set globally or from within your PHP scripts from these options;

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…
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PHP scripts are only allocated a certain amount of memory that it can use, and whet it reaches the limit, it will produce the following error;

PHP Fatal error: Allowed memory size of xxxx bytes exhausted (tried to allocate yyyy) in yourscript.php

To fix this, you’ll need to increase the memory limit for PHP scripts using any of the following methods;

Maximum upload file size for PHP is bound to the lowest value of both post_max_size and upload_max_filesize directives in your configuration. post_max_size affects maximum file upload size as file upload is normally an HTTP POST operation.

You can update your PHP configuration file for these two directives to the values that fit your requirement and then restart your web server.

The following example allows for file upload of not more than 200MB.

post_max_size = 200M
upload_max_filesize = 250M

Alternatively, you can add the following lines in your .htaccess and the setting will apply to scripts from within the .htaccess‘ directory.

php_value upload_max_filesize 200M
php_value post_max_size 250M

Restart Apache for the changes to take effect.

The command used to list directory content in Linux is ls. With the -R option, ls will traverse the directory recursively, showing the content of the particular directory and all its subdirectories. Relative directory path is displayed before the directory content is actually listed.

The following is an example of the command in use;

$ ls -R testdir/
testdir/:
subdir1  subdir2

testdir/subdir1:
subsubdir1  subsubdir2

testdir/subdir1/subsubdir1:
file1

testdir/subdir1/subsubdir2:
file2

testdir/subdir2:
subsubdir1  subsubdir2

testdir/subdir2/subsubdir1:
file3

testdir/subdir2/subsubdir2:
file4