big | Solves the domain problem | Web Framework library
kandi X-RAY | big Summary
kandi X-RAY | big Summary
Small application framework. Solves the domain problem of building web applications.
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Top functions reviewed by kandi - BETA
- Define a scope function
- Formats a value into an object .
- Search tree of listeners .
- Execute method
- Processes an include object .
- Schema constructor .
- Decode the symbol .
- Adds a listener to the listener tree .
- Stringify a property .
- List constructor .
big Key Features
big Examples and Code Snippets
Lines of Code : 37License : Permissive (MIT License)
Copydef is_prime_big(n, prec=1000):
"""
>>> from maths.prime_check import is_prime
>>> # all(is_prime_big(i) == is_prime(i) for i in range(1000)) # 3.45s
>>> all(is_prime_big(i) == is_prime(i) for i in range(25 @Benchmark
public void largeArrayLoopSum(BigArray bigArray, Blackhole blackhole) {
for (int i = 0; i < ARRAY_SIZE - 1; i++) {
bigArray.data[i + 1] += bigArray.data[i];
}
blackhole.consume(bigArray.data);
} public static BigInteger generateBigNumber() {
try {
TimeUnit.SECONDS.sleep(2);
} catch (InterruptedException e) {
}
return new BigInteger("12345");
} Community Discussions
Trending Discussions on big
QUESTION
ANSWER
Answered 2022-Apr-08 at 15:31Consider a typical use case of a std::any: You pass it around in your code, move it dozens of times, store it in a data structure and fetch it again later. In particular, you'll likely return it from functions a lot.
As it is now, the pointer to the single "do everything" function is stored right next to the data in the any. Given that it's a fairly small type (16 bytes on GCC x86-64), any fits into a pair of registers. Now, if you return an any from a function, the pointer to the "do everything" function of the any is already in a register or on the stack! You can just jump directly to it without having to fetch anything from memory. Most likely, you didn't even have to touch memory at all: You know what type is in the any at the point you construct it, so the function pointer value is just a constant that's loaded into the appropriate register. Later, you use the value of that register as your jump target. This means there's no chance for misprediction of the jump because there is nothing to predict, the value is right there for the CPU to consume.
In other words: The reason that you get the jump target for free with this implementation is that the CPU must have already touched the any in some way to obtain it in the first place, meaning that it already knows the jump target and can jump to it with no additional delay.
That means there really is no indirection to speak of with the current implementation if the any is already "hot", which it will be most of the time, especially if it's used as a return value.
On the other hand, if you use a table of function pointers somewhere in a read-only section (and let the any instance point to that instead), you'll have to go to memory (or cache) every single time you want to move or access it. The size of an any is still 16 bytes in this case but fetching values from memory is much, much slower than accessing a value in a register, especially if it's not in a cache. In a lot of cases, moving an any is as simple as copying its 16 bytes from one location to another, followed by zeroing out the original instance. This is pretty much free on any modern CPU. However, if you go the pointer table route, you'll have to fetch from memory every time, wait for the reads to complete, and then do the indirect call. Now consider that you'll often have to do a sequence of calls on the any (i.e. move, then destruct) and this will quickly add up. The problem is that you don't just get the address of the function you want to jump to for free every time you touch the any, the CPU has to fetch it explicitly. Indirect jumps to a value read from memory are quite expensive since the CPU can only retire the jump operation once the entire memory operation has finished. That doesn't just include fetching a value (which is potentially quite fast because of caches) but also address generation, store forwarding buffer lookup, TLB lookup, access validation, and potentially even page table walks. So even if the jump address is computed quickly, the jump won't retire for quite a long while. In general, "indirect-jump-to-address-from-memory" operations are among the worst things that can happen to a CPU's pipeline.
TL;DR: As it is now, returning an any doesn't stall the CPU's pipeline (the jump target is already available in a register so the jump can retire pretty much immediately). With a table-based solution, returning an any will stall the pipeline twice: Once to fetch the address of the move function, then another time to fetch the destructor. This delays retirement of the jump quite a bit since it'll have to wait not only for the memory value but also for the TLB and access permission checks.
Code memory accesses, on the other hand, aren't affected by this since the code is kept in microcode form anyway (in the µOp cache). Fetching and executing a few conditional branches in that switch statement is therefore quite fast (and even more so when the branch predictor gets things right, which it almost always does).
QUESTION
Motivating background info: I maintain a C++ library, and I spent way too much time this weekend tracking down a mysterious memory-corruption problem in an application that links to this library. The problem eventually turned out to be caused by the fact that the C++ library was built with a particular -DBLAH_BLAH compiler-flag, while the application's code was being compiled without that -DBLAH_BLAH flag, and that led to the library-code and the application-code interpreting the classes declared in the library's header-files differently in terms of data-layout. That is: sizeof(ThisOneParticularClass) would return a different value when invoked from a .cpp file in the application than it would when invoked from a .cpp file in the library.
So far, so unfortunate -- I have addressed the immediate problem by making sure that the library and application are both built using the same preprocessor-flags, and I also modified the library so that the presence or absence of the -DBLAH_BLAH flag won't affect the sizeof() its exported classes... but I feel like that wasn't really enough to address the more general problem of a library being compiled with different preprocessor-flags than the application that uses that library. Ideally I'd like to find a mechanism that would catch that sort of problem at compile-time, rather than allowing it to silently invoke undefined behavior at runtime. Is there a good technique for doing that? (All I can think of is to auto-generate a header file with #ifdef/#ifndef tests for the application code to #include, that would deliberately #error out if the necessary #defines aren't set, or perhaps would automatically-set the appropriate #defines right there... but that feels a lot like reinventing automake and similar, which seems like potentially opening a big can of worms)
ANSWER
Answered 2022-Apr-04 at 16:07One way of implementing such a check is to provide definition/declaration pairs for global variables that change, according to whether or not particular macros/tokens are defined. Doing so will cause a linker error if a declaration in a header, when included by a client source, does not match that used when building the library.
As a brief illustration, consider the following section, to be added to the "MyLibrary.h" header file (included both when building the library and when using it):
QUESTION
I am using a company-hosted (Bitbucket) git repository that is accessible via HTTPS. Accessing it (e.g. git fetch) worked using macOS 11 (Big Sur), but broke after an update to macOS 12 Monterey.
*
After the update of macOS to 12 Monterey my previous git setup broke. Now I am getting the following error message:
...ANSWER
Answered 2021-Nov-02 at 07:12Unfortunately I can't provide you with a fix, but I've found a workaround for that exact same problem (company-hosted bitbucket resulting in exact same error).
I also don't know exactly why the problem occurs, but my best guess would be that the libressl library shipped with Monterey has some sort of problem with specific (?TLSv1.3) certs. This guess is because the brew-installed openssl v1.1 and v3 don't throw that error when executed with /opt/homebrew/opt/openssl/bin/openssl s_client -connect ...:443
To get around that error, I've built git from source built against different openssl and curl implementations:
- install
autoconf,opensslandcurlwith brew (I think you can select the openssl lib you like, i.e. v1.1 or v3, I chose v3) - clone git version you like, i.e.
git clone --branch v2.33.1 https://github.com/git/git.git cd gitmake configure(that is why autoconf is needed)- execute
LDFLAGS="-L/opt/homebrew/opt/openssl@3/lib -L/opt/homebrew/opt/curl/lib" CPPFLAGS="-I/opt/homebrew/opt/openssl@3/include -I/opt/homebrew/opt/curl/include" ./configure --prefix=$HOME/git(here LDFLAGS and CPPFLAGS include the libs git will be built against, the right flags are emitted by brew on install success of curl and openssl; --prefix is the install directory of git, defaults to/usr/localbut can be changed) make install- ensure to add the install directory's subfolder
/binto the front of your$PATHto "override" the default git shipped by Monterey - restart terminal
- check that
git versionshows the new version
This should help for now, but as I already said, this is only a workaround, hopefully Apple fixes their libressl fork ASAP.
QUESTION
After updating Android emulator to 31.2.6 today, emulator stop working. It says Connecting to the Emulator and process of qemu-system-aarch64 is become unresponsive
It worked well on previous version of emulator, which I downloaded with Arctic Fox, but can't rollback it
AS version: Bumblebee 2021.1.1 (downloaded it using Toolbox app)
macOS: Big Sur 11.6
...ANSWER
Answered 2022-Jan-27 at 11:25Here is two workarounds I've found for now:
Try to close the process of
qemu-system-aarch64in Monitor System, not force close. When you click close emulator will prompt about saving state and two buttonsYes/No. Ignore them and click close icon in the left corner, then emulator start working correctly. Tried it at least once and it worked.Because it's Bumblebee, emulator open inside AS by default. To turn off it, open:
Preferences -> Tools -> Emulator
And uncheck checkbox as in the image below
Then emulator will work correctly
Anyway, I think it's bug of 31.2.6
QUESTION
Since big-endian and little-endian have to do with byte order, and since one u8 is one byte, wouldn't u8::from_be_bytes and u8::from_le_bytes always have the same behavior?
ANSWER
Answered 2022-Feb-01 at 12:11On a byte-level there is no difference. To better understand how Big-endian differs from Little-endian, consider this:
As can be seen, we have three bytes in the example, the bits of each having a different color. Notice how the bits in each byte look exactly the same in both BE and LE.
That is language-agnostic BTW.
As for the Rust functions operating on u8, Trent explained it very well. My answer focuses more on the part how BE/LE work in general.
QUESTION
Given a struct, for instance:
...ANSWER
Answered 2021-Sep-16 at 15:30Given this macro:
QUESTION
In vuejs2 app having select input with rather big options list it breaks design of my page on extra small devices. Searching in net I found “size” property, but that not what I I need : I want to have dropdown selection, which is the default. Are there some other decision, maybe with CSS to set max-height of dropdown selection area.
Modeified PART # 1: I made testing demo page at http://photographers.my-demo-apps.tk/sel_test it has 2 select inputs with custom design and events as in this example link How to Set Height for the Drop Down of Select box and following workaround at js fiddle:
...ANSWER
Answered 2022-Jan-15 at 16:00Unfortunately, you cannot chant the height of a dropdown list (while using ).
It is confirmed here.
you can build it yourself using divs & v-for (assuming you get the list from an outsource) and then you can style it as you wish.
apologies for barring bad news.
QUESTION
I am working with WSL a lot lately because I need some native UNIX tools (and emulators aren't good enough). I noticed that the speed difference when working with NPM/Yarn is incredible.
I conducted a simple test that confirmed my feelings. The test was running npx create-react-app my-test-app and the WSL result was Done in 287.56s. while GitBash finished with Done in 10.46s..
This is not the whole picture, because the perceived time was higher in both cases, but even based on that - there is a big issue somewhere. I just don't know where. The project I'm working on uses tens of libraries and changing even one of them takes minutes instead of seconds.
Is this something that I can fix? If so - where to look for clues?
Additional info:
my processor: Processor AMD Ryzen 7 5800H with Radeon Graphics, 3201 Mhz, 8 Core(s), 16 Logical Processors
I'm running Windows 11 with all the latest updates to both the system and the WSL. The chosen system is Ubuntu 20.04
I've seen some questions that are somewhat similar like 'npm install' extremely slow on Windows, but they don't touch WSL at all (and my pure Windows NPM works fast).
the issue is not limited to NPM, it's also for Yarn
another problem that I'm getting is that file watching is not happening (I need to restart the server with every change). In some applications I don't get any errors, sometimes I get the following:
...
ANSWER
Answered 2021-Aug-29 at 15:40Since you mention executing the same files (with proper performance) from within Git Bash, I'm going to make an assumption here. Correct me if I'm wrong on this, and I'll delete the answer and look for another possibility.
This would be explained (and expected) if your files are stored on /mnt/c (a.k.a. C:, or /C under Git Bash) or any other Windows drive, as they would likely need to be to be accessed by Git Bash.
WSL2 uses the 9P protocol to access Windows drives, and it is currently known to be very slow when compared to:
- Native NTFS (obviously)
- The ext4 filesystem on the virtual disk used by WSL2
- And even the performance of WSL1 with Windows drives
I've seen a git clone of a large repo (the WSL2 Linux kernel Github) take 8 minutes on WSL2 on a Windows drive, but only seconds on the root filesystem.
Two possibilities:
If possible (and it is for most Node projects), convert your WSL to version 1 with
wsl --set-version 1. I always recommend making a backup withwsl --exportfirst.And since you are making a backup anyway, you may as well just create a copy of the instance by
wsl --importing your backup as--version 1(as the last argument). WSL1 and WSL2 both have their uses, and you may find it helpful to keep both around.See this answer for more details on the exact syntax..
Or just move the project over to somewhere under the WSL root, such as
/home/username/src/.
QUESTION
I want to install PHP 7.2 on MacBook Pro M1, macOS Big Sur (11.5.2).
I already read an article (How To Install a PHP 7.2 on macOS 10.15 Catalina Using Homebrew and PECL), but it doesn't work for me.
I used Homebrew to install PHP 7.2 using this command:
...ANSWER
Answered 2021-Dec-11 at 03:40Since PHP 7.2 is not supported anymore, it's got delisted from the Hombrew core repository.
You've to find a third-party repository that still contains an older PHP version, such as the shivammathur/php repository.
You need to tap the repository like this in your Homebrew:
QUESTION
I could use some help to work out if overloading math operators can be made to work with mixin via does (or but) in a way that avoids the ambiguity error below... this module:
ANSWER
Answered 2021-Sep-09 at 22:09Add an is default trait to your multis:
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