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Looking for a fast hash-function


Looking for a fast hash-function

By : user3861964
Date : November 21 2020, 07:01 PM
wish help you to fix your issue Take a look at Murmur hash. It has a nice space/collision trade-off:
http://sites.google.com/site/murmurhash/
code :


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A fast hash function for string in C#

A fast hash function for string in C#


By : aslia
Date : March 29 2020, 07:55 AM
wish helps you I want to hash a string of length up-to 30. What will be the best idea to do that if time is my concern. The function will be called over 100 million times. currently I am using the following code,
code :
static UInt64 CalculateHash(string read)
{
    UInt64 hashedValue = 3074457345618258791ul;
    for(int i=0; i<read.Length; i++)
    {
        hashedValue += read[i];
        hashedValue *= 3074457345618258799ul;
    }
    return hashedValue;
}
Fast hash function with collision possibility near SHA-1

Fast hash function with collision possibility near SHA-1


By : cheezd
Date : March 29 2020, 07:55 AM
What's a fast ideal hash function for int32?

What's a fast ideal hash function for int32?


By : ashwin kumar
Date : October 31 2020, 01:52 PM
I hope this helps you . You will probably get better results using a simple hash like FNV32-1A.
Complex instructions like crc32, clmul, aes, etc... have higher throughputs, but they can also have higher latencies. By themselves, they won't necessarily give you a better distribution either.
Fast hash function for `std::vector`

Fast hash function for `std::vector`


By : Tony
Date : March 29 2020, 07:55 AM
wish help you to fix your issue NOTE: As per the comments, you get a 25-50x speed-up by compiling with optimizations. Do that, first. Then, if it's still too slow, see below.
Fast hash function for IPv4/6 addresses

Fast hash function for IPv4/6 addresses


By : Doum
Date : March 29 2020, 07:55 AM
To fix the issue you can do By the way, I am assuming you meant 4Gb, not 4Mb for the 32-bit index size above. Also, that assumes that you only need one byte per entry (max of 255 hits)
It is hard to know which hash will be better without knowing the distribution of addresses. If they are more or less randomly spread over the address space (and, yes, I know that most IPv6 addresses are not allocated), just pick a few bits of the address and use that.
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