xxhash | A super-fast hash algorithm in a single C++ header | Hashing library
kandi X-RAY | xxhash Summary
kandi X-RAY | xxhash Summary
This is an implementation of Yann Collet's xxHash32 and xxHash64 algorithms (Just include the short xxhash32.h or xxhash64.h header - that's it, no external dependencies !. Performance of my library is usually on par with his original code. His code can be hard to understand due to the massive use of #ifdef, therefore I posted a detailled explanation of the algorithm on my website (which is also the main repository; GitHub serves as a mirror only).
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QUESTION
I downloaded the release build without modifying (https://www.lwjgl.org/customize) I put all the classes in Eclipse. Some classes are not recognized
The codes that do not need these classes in error, work normally. As in https://www.lwjgl.org/guide
All the classes I put:
...ANSWER
Answered 2021-Mar-27 at 09:20You are trying to compile LWJGL 2 code here. All the imports that it cannot find pertain to the verison 2 of LWJGL. The current version that you can get from the mentioned lwjgl site is 3 and version 3 is incompatible with version 2.
Either explicitly download LWJGL 2 from e.g. http://legacy.lwjgl.org/ or rewrite your code to work with LWJGL 3.
If you go the LWJGL 2 route, though, please note that it hasn't been actively maintained anymore for more than 6 years now.
QUESTION
I want to compress/decompress a unsigned char buffer using fast-LZMA2 by 7Zip : https://github.com/conor42/fast-lzma2
In the sample there's two function :
...ANSWER
Answered 2021-Mar-09 at 07:24Check the header file for all of the functions available. This one looks like the one you need. You will need to cast your buffers as (void *)
.
fast-lzma2.h
QUESTION
While compiling a current project I get a bunch (about 80) of Linker errors that I don't know anymore how to debug further.
I am using Visual Studio 2019. It's a C++ project compiled on Windows 10.
A lot of them come from a library called libcpmt.lib. There are 2 types of error related to the library:
First it claims some function s are alredy defined in msvcprt.lib(MSVCP140.dll) (which is strange since I am using Visual Studio 2019 v142)
...ANSWER
Answered 2020-Oct-16 at 12:58In case somebody comes along a similar issue. These was a library in my included libraries that was using the static linkage (mpirxx.lib). A good way to debug this is to put /VERBOSE:LIB in your linker options. Then build and go to your Output windows where you can see which is the first library to trigger this error chain.
Thanks to Alan Birtles for the help.
QUESTION
We store representations of millions of chemical compounds as BLOBs in a MySQL database. We also keep hashes of these BLOBs when we need to query among these compounds and comparing these hashes in the queries.
Since we found out that standard hash functions(such as CRC) provided by MySQL library collides frequently for our use-case, we used a custom hash function specific to our data, wrapped it as a MySQL plugin and created a User Defined Function with this plugin as below:
...ANSWER
Answered 2020-Jul-21 at 09:42I've checked MySQL source code and built-in functions and I could not find any way to run XXHash in MySQL routines. It seems XXHash is used by MySQL internally and it is not user-visible.
In order to run XXHash in MySQL routines, I have developed a plugin in case anyone needs to use XXHash algorithm in MySQL server.
This plug in can be found here: Github repository for xxhash_mysql_plugin.
After installing plug in you can run the xxhash function in your select statements as below:
QUESTION
I tried using a few hash APIs but it gives compile error. I tried 2 different hash APIs and 2 different IDEs and compiler but it gives the same errors. It looks like a linker error. Often there is a "unresolved external externals" or "undefined to" compile error. How can I fix compile error?
test.cpp:
...ANSWER
Answered 2020-Jul-06 at 04:07A likely reason is that your project is missing xxhash.c
in its list of source files to compile. Each *.c
file becomes an object file, which is linked during the last stage. So without it, no symbol defined in xxhash.c
is ever created.
Another way to solve this issue is to #define XXH_INLINE_ALL
just before #include "xxhash.h"
. This will inline the code, as if it was present in the local source file, and as a consequence, it will not need to link to another object file. Inlining is also good for performance on small data, but increases binary size.
QUESTION
Could someone provide more details or examples about how works this load balance algorithm?
...Consistent hashing (ketama hash) based load balancer for even load distribution/redistribution when the connection pool changes. This load balancing policy is applicable only for HTTP-based connections. A user specified HTTP header is used as the key with xxHash hashing.
ANSWER
Answered 2020-May-17 at 20:16The LoadBalancerSettings.ConsistentHashLB
flag is for an Envoy configuration, and there's more detail in Envoy's Load Balancing Docs:
The ring/modulo hash load balancer implements consistent hashing to upstream hosts. The algorithm is based on mapping all hosts onto a circle such that the addition or removal of a host from the host set changes only affect 1/N requests. This technique is also commonly known as “ketama” hashing.
It's an hash algorithm that decreases the impact of servers being added and removed from Envoy's balancing pool (e.g. the servers behind a VirtualService).
Without such an algorithm, adding a single server to the pool causes hashes to map to different servers:
We wrote ketama to replace how our memcached clients mapped keys to servers...whenever we added or removed servers from the pool, everything hashed to different servers, which effectively wiped the entire cache.
Back to Istio - Envoy's docs again note:
A consistent hashing load balancer is only effective when protocol routing is used that specifies a value to hash on.
which means - specify a header to generate the hash from. From Istio docs:
httpHeader | string | REQUIRED. The name of the HTTP request header that will be used to obtain the hash key. If the request header is not present, the load balancer will use a random number as the hash, effectively making the load balancing policy random.
QUESTION
I am developing a netcoreapp2.0
console application and I need access to the whole encoding package from .NET.
I have already added the System.Text.Encoding.CodePages Version=4.4.0
Nuget package from this page to my project and cleaned/restored the project several time.
However I can't get the extra encoding I need.
The following code:
...ANSWER
Answered 2017-Oct-30 at 14:01I am adding this as the answer regarding Gabriel's suggestion that it might help other people in the future too.
I cleaned the Nuget cache, repaired my ".NET Core SDK 2.0.2" installation, did a "Solution and Project Cleanup" and rebuilt my project, and the Encoding.RegisterProvider(CodePagesEncodingProvider.Instance)
code started to work fine.
Now I can access the extra code pages using the Encoding.GetEncoding()
method, however I still get the same list of encodings from Encoding.GetEncodings()
method after adding the extra encodings.
From my perspective the Encoding.GetEncodings()
method should return all the encodings available after more of them have been added.
QUESTION
I am trying to install OpenliteSpeed server on Fedora 31. There are no binaries available so I thought of compiling the source code. Am following instructions from this page: https://openlitespeed.org/kb/installation-from-source-code/
but I am getting errors at the make & make install step.
This is the error I get:
...ANSWER
Answered 2019-Dec-03 at 19:41Please follow this method to install from compiled binary.
Download the OpenLiteSpeed binary from the Download page or use the wget
command to download it from the console, here we use v1.6.4 as example:
QUESTION
My LKM hijacks stdin/sshd inputs: https://pastebin.com/RChpbt9G
...ANSWER
Answered 2019-Jun-20 at 04:28Looking at the log file you can see:
QUESTION
Moved from here, because it's about compiling software.
My original problem: I want to play Super Mario Galaxy 2 with another player. But whatever keys I assign to move the cursor, it instead moves it all the way to the corner (or edge) of the screen. Linux theoretically has the ability to have multiple cursors (at least the display system "X" allows it), but from a research it looks like I would have to make major changes to the system to actually use it. And even then I doubt that Dolphin would support it.
My current problem: Relative motion of a cursor from keys is present in the current betas of Dolphin, but I can't get it installed. There are no regular installers for it, instead there are source downloads and this tutorial.
I installed the dependencies, downloaded the beta, created and entered the "Build" directory, but when I try cmake ..
, I get this output:
ANSWER
Answered 2018-Oct-02 at 23:52Many thanks to the user dugan on linuxquestions.org! He solved my problem here.
I just had to install Qt from a different source (I used the Qt installer, as mentioned in the question), to have a different version of it in another location. The reason for that is that many programs on Debian rely on an earlier version of Qt, so just updating it would break a lot, that's also why Synaptic&Co. don't update it.
Then I had to add the binary to the PATH
variable, like so:
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