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How efficient is locking an unlocked mutex? What is the cost of a mutex?
... system limit. But too many of them spells nightmare for debugging. Simple table:
Less locks means more contentions (slow syscalls, CPU stalls) and lesser parallelism
Less locks means less problems debugging multi-threading problems.
More locks means less contentions and higher parallelism
More lo...
Performance optimization strategies of last resort [closed]
... constantly figuring out things that the programmer knows are fairly predictable. In other words, don't "interpret" the sequence of things to do, "compile" it.
That redesign is done, shrinking the source code by a factor of 4, and the time is reduced to 10 seconds.
Now, because it's getting so q...
How to write WinForms code that auto-scales to system font and dpi settings?
...f you are not using Dock
modes or a Layout Manager like FlowLayoutPanel or TableLayoutPanel.
Base classes derived from ContainerControl should leave AutoScaleMode set to Inherit (the default value set in class ContainerControl; but NOT the default set by the designer). If you set it to anything else...
urlencode vs rawurlencode?
... string before return.
Grand Summary
Both use the same hexchars lookup table
URIEncode doesn't terminate a string with \0, raw does.
If you're working in EBCDIC I'd suggest using RawUrlEncode, as it manages the ~ that UrlEncode does not (this is a reported issue). It's worth noting that ASCII an...
How to create a new database after initally installing oracle database 11g Express Edition?
...O myschema;
Now you can connect via Oracle SQL Developer and create your tables.
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What's invokedynamic and how do I use it?
...swered Jul 10 '11 at 4:59
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How to design a multi-user ajax web application to be concurrently safe
...tes requests, one per second, 5 per second, whatever you regard as an acceptable latency. This can be rather cruel to your infrastructure if you do not configure your (Apache?) and (php?) well enough to be "lightweight" starters. It is desirable to optimize the polling request on the serverside so t...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
...en WMIC Path Win32_LocalTime Get Day,Hour,Minute,Month,Second,Year /Format:table. Likewise, to get 20120623-1619 in my local Amsterdam time zone, in one line: for /f %%a in ('wmic os get LocalDateTime ^| findstr ^[0-9]') do (set ts=%%a) & set datetime=%ts:~0,8%-%ts:~8,4%
– ...
How does this giant regex work?
...PHP to see the corresponding output, or look up each character in an ASCII table
– Michael Mrozek
Jul 25 '10 at 6:14
@...
OO Design in Rails: Where to put stuff
...way. Or to put it another way, a model doesn't have to be an analogue of a table, or even related to anything stored at all. Even better, as long as you name your file in app/models according to Rails' conventions (call #underscore on the class name to find out what Rails will look for), Rails will ...