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What are deferred objects?
...t provides a way to register multiple callbacks into self-managed callback queues, invoke callback queues as appropriate, and relay the success or failure state of any synchronous or asynchronous function.
Deferred Methods:
deferred.done()
Add handlers to be called when the Deferred object is reso...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...有解决问题，错误反倒变着花样的出现了：
max number of retries exhausted, couldn’t send query, couldn’t send query: Broken pipe
接着使用strace跟踪了一下PHP脚本，发现进程卡在了recvfrom操作上：
shell> strace -f -r -p <PID>
recvfrom(<FD>,
通...
#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular s
...o using #if, I can write this
DoSomethingSlowWithTimeout(DEBUG_ENABLED? 5000 : 1000);
... instead of ...
#ifdef DEBUG_MODE
DoSomethingSlowWithTimeout(5000);
#else
DoSomethingSlowWithTimeout(1000);
#endif
Second, you're in a better position if you want to migrate from a #define to a globa...
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare();
...
idleTimer = new IdleTimer(5000, new IIdleCallback() { @Override public void inactivityDetected() { AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder( getApplicationContext()); ...
Easiest way to open a download window without navigating away from the page
...ds:
<script type="text/javascript">
setTimeout('startDownload()', 5000); //starts download after 5 seconds
</script>
(From here.)
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On showing dialog i get “Can not perform this action after onSaveInstanceState”
...ected void onPause()
{
super.onPause();
sHandler.postDelayed(test, 5000);
}
Runnable test = new Runnable()
{
@Override
public void run()
{
if (mIsAfterOnSaveInstanceState)
{
// TODO: Consider saving state so that during or after onPostResume a dialog ...
How much faster is Redis than mongoDB?
...his post about Redis and MongoDB insertion performance analysis:
Up to 5000 entries mongodb $push is faster even when compared to Redis RPUSH, then it becames incredibly slow, probably the mongodb array type has linear insertion time and so it becomes slower and slower. mongodb might gain a bit ...
Qt events and signal/slots
...signals and slots. Signals can get delivered immediately or deferred via a queue (if you are using threads).
A signal can be generated.
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What does multicore assembly language look like?
...is software support for each thread to set up its own tables and messaging queues. The OS uses those to do the actual multi-threaded scheduling.
As far as the actual assembly is concerned, as Nicholas wrote, there's no difference between the assemblies for a single threaded or multi threaded appli...
How to get folder path from file path with CMD
...om the "for /?" command on the prompt. Hope it helps.
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Top 10 DOS Batch tips (Yes, DOS Batch...) shows batchparams.bat (link to source as a gist):
C:\Temp>batchparams.bat c:\windows\notepad.exe
%~1 = c:\windows\notepad.exe
%~f1 = c:\WINDOWS\NOTEPAD.EXE
%~d1 = ...