og | https : //www.drupal.org/project/og | Networking library

Facebook parses all tags when the page loads. If you add tags afterwards you have to use https://developers.facebook.com/docs/reference/javascript/FB.XFBML.parse/ to reparse the specific tag or the whole page.

Also be aware that dynamically setting og:image in javascript will not work. Facebook will scrape the URL and look for og:image. So what the og:image is when the user clicks the share button doesn't matter.

GCC uses COMDAT section groups when available to implement vague linkage. Despite being explicitly named as MY_C_SECTION, the compiler still emits a COMDAT group with _ZZN7my_prod1C8instanceEvE1c as the key symbol:

You can use hooks= parameter in requests.get() method and explicitly urlencode the Location HTTP header. For example:

rdi is a caller-saved register and is hence trashed by the call to strlen. To preserve its contents, the compiler emitted code to move its contents to r14, copying it back once every iteration as an argument to strlen.

The addq $8, %rsp instruction releases stack space previously allocated by pushq %rax. This stack space was allocated to satisfy the stack alignment requirements imposed by the amd64 SysV ABI.

Refer to the amd64 SysV ABI supplement for the full calling convention and a list of caller/callee saved registers.

For the 'most efficient' solution, you're just looking for the GCD of n, d, so the Euclidean algorithm solves this in O(log(max(n,d)) multiplications. Unless you're a theoretician or dealing with massive numbers, it's probably not worth trying to optimize much beyond that. See, for example, the wiki on greatest common divisors for more information on GCD calculation, but to summarize, you'd have to use fast multiplication algorithms with inputs in the 'thousands of digits' range to start outperforming normal multiplication.

For the surprising timing results, it's likely due to while loop overhead compared to for-loops from Python internals. Try disassembling both functions-- the for-loop iteration is done in C, and the while loop iteration is done in Python bytecode, which is slower.

On the short time-scales you're measuring, performance can be highly unpredictable. As a result, timing many short loops might tell you more about the efficiency of the language's loop implementation than the algorithmic efficiency of your code.

The fact that you only saw results compatible with the asymptotic predictions when your inputs got large isn't all too surprising-- it's the core idea of asymptotic analysis.

awk suites this role better:

(This answer is a summary of comments posted above by Antti Haapala, klutt and Peter Cordes.)

GCC allocates more space than "necessary" in order to ensure that the stack is properly aligned for the call to proc: the stack pointer must be adjusted by a multiple of 16, plus 8 (i.e. by an odd multiple of 8). Why does the x86-64 / AMD64 System V ABI mandate a 16 byte stack alignment?

What's strange is that the code in the book doesn't do that; the code as shown would violate the ABI and, if proc actually relies on proper stack alignment (e.g. using aligned SSE2 instructions), it may crash.

So it appears that either the code in the book was incorrectly copied from compiler output, or else the authors of the book are using some unusual compiler flags which alter the ABI.

Modern GCC 11.2 emits nearly identical asm (Godbolt) using -Og -mpreferred-stack-boundary=3 -maccumulate-outgoing-args, the former of which changes the ABI to maintain only 2^3 byte stack alignment, down from the default 2^4. (Code compiled this way can't safely call anything compiled normally, even standard library functions.) -maccumulate-outgoing-args used to be the default in older GCC, but modern CPUs have a "stack engine" that makes push/pop single-uop so that option isn't the default anymore; push for stack args saves a bit of code size.

One difference from the book's asm is a movl $0, %eax before the call, because there's no prototype so the caller has to assume it might be variadic and pass AL = the number of FP args in XMM registers. (A prototype that matches the args passed would prevent that.) The other instructions are all the same, and in the same order as whatever older GCC version the book used, except for choice of registers after call proc returns: it ends up using movslq %edx, %rdx instead of cltq (sign-extend with RAX).

CS:APP 3e global edition is notorious for errors in practice problems introduced by the publisher (not the authors), but apparently this code is present in the North American edition, too. So this may be the author's mistake / choice to use actual compiler output with weird options. Unlike some of the bad global edition practice problems, this code could have come unmodified from some GCC version, but only with non-standard options.

Related: Why does GCC allocate more space than necessary on the stack, beyond what's needed for alignment? - GCC has a missed-optimization bug where it sometimes reserves an additional 16 bytes that it truly didn't need to. That's not what's happening here, though.

glob error [Error: EACCES: permission denied, scandir '/root/.npm/_logs'] {

This means it is trying to read something on 'root' directory, something which always needs root access.

Try to run the command like this:

Found a solution for this so posting as answer.

This can be done by extracting Page Source of a webpage and then parsing that XML and fetching list of BASE URLs.

Steps as follow:

1- Load that specific video URL in Webview and get Page Source inside onPageFinished