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Do spurious wakeups in Java actually happen?
...nt three days searching for the cause of a multi-threading problem on a 24 core machine (JDK 6). 4 of 10 executions experienced that without any pattern. This never happened on 2 core or 8 cores.
Studied some online material and this is not a Java problem but a general rare but expected behavior.
...
Automatic post-registration user authentication
...dont have to add those in your controller.
use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use YourNameSpace\UserBundle\Entity\User;
class LoginController extends AbstractController{
public funct...
Maven in Eclipse: step by step installation [closed]
...rement: Maven Integration for Eclipse 1.6.0.20150526-2032 (org.eclipse.m2e.core 1.6.0.20150526-2032) requires 'bundle com.google.guava [14.0.1,16.0.0)' but it could not be found
Missing requirement: Maven Integration for Eclipse 1.6.1.20150625-2338 (org.eclipse.m2e.core 1.6.1.20150625-2338) requ...
How to change line-ending settings
...l way to control this is with git config
For example
git config --global core.autocrlf true
For details, scroll down in this link to Pro Git to the section named "core.autocrlf"
If you want to know what file this is saved in, you can run the command:
git config --global --edit
and the git ...
Where in an Eclipse workspace is the list of projects stored?
...
Windows:
<workspace>\.metadata\.plugins\org.eclipse.core.resources\.projects\
Linux / osx:
<workspace>/.metadata/.plugins/org.eclipse.core.resources/.projects/
Your project can exist outside the workspace, but all Eclipse-specific metadata are stored in that org.ecl...
Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...ecuted concurrently upon multiple computing resources (generally processor cores) or else that not all of the tasks rely upon the concurrent usage of the same resource -- that is, some tasks may depend on one system subcomponent (disk storage, say) while some tasks depend on another (receiving commu...
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
...mysql_config', what))
After this I got another error as following:
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: dlopen(/Library/Python/2.7/site-packages/MySQL_python-1.2.4b4-py2.7-macosx-10.8-intel.egg/_mysql.so, 2): Library not loaded: libmysqlclient.18.dylib
Referenc...
Comparing two byte arrays in .NET
...turn a1.SequenceEqual(a2);
}
The (guts of the) implementation as of .NET Core 3.1.0 can be found here.
I've revised @EliArbel's gist to add this method as SpansEqual, drop most of the less interesting performers in others' benchmarks, run it with different array sizes, output graphs, and mark Spa...
Eclipse syntax highlighting preferences save and restore
... these files: {Eclipse workspace directory}/.metadata/.plugins/org.eclipse.core.runtime/.settings/*.prefs
I tried a fresh Eclipse install on another machine and after copying those files over, all my settings were restored perfectly.
...
When to use volatile with multi threading?
...e.
Real CPUs have coherent caches / shared memory: after a store from one core becomes globally visible, no other core can load a stale value. (See also Myths Programmers Believe about CPU Caches which talks some about Java volatiles, equivalent to C++ atomic<T> with seq_cst memory order.)
...