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Why does changing 0.1f to 0 slow down performance by 10x?
... depending on whether 0 or 0.1 is used.
Here's the test code compiled on x64:
int main() {
double start = omp_get_wtime();
const float x[16]={1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0,2.1,2.2,2.3,2.4,2.5,2.6};
const float z[16]={1.123,1.234,1.345,156.467,1.578,1.689,1.790,1.812,1.923,2...
User Authentication in ASP.NET Web API
...g role)
{
string[] parts = UTF8Encoding.UTF8.GetString(Convert.FromBase64String(Request.Headers.Authorization.Parameter)).Split(':');
if (parts.Length != 2 || !Membership.ValidateUser(parts[0], parts[1]))
throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.Unau...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...
Hank Gay
64.1k2929 gold badges144144 silver badges216216 bronze badges
answered Sep 12 '08 at 18:42
Ethan Post...
Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...68160001953743683783272702066311903448533894049486008426303248121757146615064636953144900245
174442911064952028008546304
50,000 => a very large number!
I agree with @SB that you should always state your assumptions: Mine is that you don't need to paste twice to double the number of characters. ...
Constant Amortized Time
...count of money
5th room size = fits 32 count of money
6th room size = fits 64 count of money
7th room size = fits 128 count of money
8th room size = fits 256 count of money
9th room size = fits 512 count of money
10th room size= fits 1024 count of money
11th room size= fits 2,048 count of money
...
...
How can I use interface as a C# generic type constraint?
...0x10)) | (data[position++] << 0x18));
}
public ulong ReadInt64()
{
return (ulong)(((data[position++] | (data[position++] << 8)) | (data[position++] << 0x10)) | (data[position++] << 0x18) |
(data[position++] << 0x20) | (data[...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
... Georgy
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answered Apr 10 '10 at 10:16
cryocryo
12.5k44 gold badges282...
STL or Qt containers?
...at e.g. QVector uses int as its index, thus limiting 31-bit sizes (even on 64-bit systems). Moreover, it can't even store INT_MAX elements of size larger than 1 byte. E.g. the largest .size() I could have of QVector<float> on x86_64 Linux gcc was 536870907 elements (2²⁹-5), while std::vecto...
Is SHA-1 secure for password storage?
...tions.
About SHA-1 cost:
The elementary cost of SHA-1 is about hashing a 64-byte block. That's how SHA-1 works: data is padded, then split into 64-byte blocks. The cost of processing a single block is about 500 clock cycles on an Intel Core2 system, and that's for a single core. MD5 and MD4 are fa...
What's the need of array with zero elements?
...xample_large_s
{
u32 first; // align to CL
u32 data;
....
u64 *second; // align to second CL after the first one
....
};
In code you can declare them using GCC extensions like:
__attribute__((aligned(CACHE_LINE_BYTES)))
But you still want to make sure this is enforced in ru...