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Performance optimization strategies of last resort [closed]
...t's hard to sample, so I give it 10 times as much work to do, but the following times are based on the original workload.
More diagnosis reveals that it is spending time in queue-management. In-lining these reduces the time to 7 seconds.
Now a big time-taker is the diagnostic printing I had been d...
How to get current time in milliseconds in PHP?
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Short answer:
64 bits platforms only!
function milliseconds() {
$mt = explode(' ', microtime());
return ((int)$mt[1]) * 1000 + ((int)round($mt[0] * 1000));
}
[ If you are running 64 bits PHP then the constant PHP_INT_SIZE equals to 8...
What is __stdcall?
I'm learning about Win32 programming, and the WinMain prototype looks like:
8 Answers
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Get image data url in JavaScript?
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GPU fingerprinting
If you are concerned about the "preciseness" of the bits then you can alter this tool to suit your needs as provided by @Kaiido's answer.
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C/C++ NaN constant (literal)?
...d. Payload content differences is implementation defined. Commonly the MSBit of the 52-bit payload is a quiet / signaling flag.. See NAN.
– chux - Reinstate Monica
Sep 24 at 14:17
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.ps1 cannot be loaded because the execution of scripts is disabled on this system [duplicate]
... work for me. Well, actually it does work if you set it for both 32 and 64 bits.
– gyozo kudor
Feb 12 '16 at 8:45
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ASP.NET 4.5 has not been registered on the Web server
In my Win 7 development machine, and in order to use SQL Express instance instead of the localDB installed by default. I unchecked "Use IIS Express" in my MVC 4 project properties page (Web tab), then I got the following error:
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What optimizations can GHC be expected to perform reliably?
...y the same, not the same by value. For example, CSE won't fire in the following code without a bunch of inlining:
x = (1 + (2 + 3)) + ((1 + 2) + 3)
y = f x
z = g (f x) y
However, if you compile via llvm, you may get some of this combined, due to its Global Value Numbering pass.
Liberate case
Thi...
coinitialize失败，返回值是0x80010106 无法在设置线程模式后对其加以更改 ...
...THREADED);
问题得以解决。
CoInitialize、CoInitializeEx都是windows的API，主要是告诉windows以什么方式为程序创建COM对象，原因是程序调用com库函数（除CoGetMalloc和内存分配函数）之前必须初始化com库。
有哪些方式呢？单线程和多...
Improve INSERT-per-second performance of SQLite
...PRAGMA page_size). Having larger page sizes can make reads and writes go a bit faster as larger pages are held in memory. Note that more memory will be used for your database.
If you have indices, consider calling CREATE INDEX after doing all your inserts. This is significantly faster than creating ...