mpx | enhanced cross-end applet framework | Chat library
kandi X-RAY | mpx Summary
kandi X-RAY | mpx Summary
Mpx, an enhanced cross-end applet framework with excellent development experience and deep performance optimization
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mpx Examples and Code Snippets
public static void main(String[] args) {
// TODO code application logic here
int toplam = 0;
for(int i = 1; i <= 100; i++)
{
toplam = toplam + i;
}
System.out.println(toplam);
}
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QUESTION
#include
#include
#include
#include
#include
using namespace std;
static inline void stick_this_thread_to_core(int core_id);
static inline void* incrementLoop(void* arg);
struct BenchmarkData {
long long iteration_count;
int core_id;
};
pthread_barrier_t g_barrier;
int main(int argc, char** argv)
{
if(argc != 3) {
cout << "Usage: ./a.out " << endl;
return EXIT_FAILURE;
}
cout << "================================================ STARTING ================================================" << endl;
int core1 = std::stoi(argv[1]);
int core2 = std::stoi(argv[2]);
pthread_barrier_init(&g_barrier, nullptr, 2);
const long long iteration_count = 100'000'000'000;
BenchmarkData benchmark_data1{iteration_count, core1};
BenchmarkData benchmark_data2{iteration_count, core2};
pthread_t worker1, worker2;
pthread_create(&worker1, nullptr, incrementLoop, static_cast(&benchmark_data1));
cout << "Created worker1" << endl;
pthread_create(&worker2, nullptr, incrementLoop, static_cast(&benchmark_data2));
cout << "Created worker2" << endl;
pthread_join(worker1, nullptr);
cout << "Joined worker1" << endl;
pthread_join(worker2, nullptr);
cout << "Joined worker2" << endl;
return EXIT_SUCCESS;
}
static inline void stick_this_thread_to_core(int core_id) {
int num_cores = sysconf(_SC_NPROCESSORS_ONLN);
if (core_id < 0 || core_id >= num_cores) {
cerr << "Core " << core_id << " is out of assignable range.\n";
return;
}
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(core_id, &cpuset);
pthread_t current_thread = pthread_self();
int res = pthread_setaffinity_np(current_thread, sizeof(cpu_set_t), &cpuset);
if(res == 0) {
cout << "Thread bound to core " << core_id << " successfully." << endl;
} else {
cerr << "Error in binding this thread to core " << core_id << '\n';
}
}
static inline void* incrementLoop(void* arg)
{
BenchmarkData* arg_ = static_cast(arg);
int core_id = arg_->core_id;
long long iteration_count = arg_->iteration_count;
stick_this_thread_to_core(core_id);
cout << "Thread bound to core " << core_id << " will now wait for the barrier." << endl;
pthread_barrier_wait(&g_barrier);
cout << "Thread bound to core " << core_id << " is done waiting for the barrier." << endl;
long long data = 0;
long long i;
cout << "Thread bound to core " << core_id << " will now increment private data " << iteration_count / 1'000'000'000.0 << " billion times." << endl;
std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
for(i = 0; i < iteration_count; ++i) {
++data;
__asm__ volatile("": : :"memory");
}
std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
unsigned long long elapsed_time = std::chrono::duration_cast(end - begin).count();
cout << "Elapsed time: " << elapsed_time << " ms, core: " << core_id << ", iteration_count: " << iteration_count << ", data value: " << data << ", i: " << i << endl;
return nullptr;
}
...ANSWER
Answered 2022-Jan-13 at 08:40It turns out that cores 0, 16, 17 were running at much higher frequency on my Skylake server.
QUESTION
I need to make a new window for video output. It should have some buttons (which I'll add later), and a video output. I have the main window with audio playback capability, and I can make a video output on the main window, not the second one. The video check using magic.python executes videopop, which opens a new window (VideoWindow).
Code:
file: main.py
...ANSWER
Answered 2021-Dec-04 at 18:00You're not setting the video output, and the QMediaPlayer in VideoWindow
is completely useless (so you can remove that), while you should use the one created for QueueWin
and set the video output with the QVideoWidget of the other window.
The "basic" solution would be the following:
QUESTION
I've started working with Puppeteer and for some reason I cannot get it to work on my box. This error seems to be a common problem (SO1, SO2) but all of the solutions do not solve this error for me. I have tested it with a clean node package (see reproduction) and I have taken the example from the official Puppeteer 'Getting started' webpage.
How can I resolve this error?
Versions and hardware ...ANSWER
Answered 2021-Nov-24 at 18:42There's too much for me to put this in a comment, so I will summarize here. Maybe it will help you, or someone else. I should also mention this is for RHEL EC2 instances behind a corporate proxy (not Arch Linux), but I still feel like it may help. I had to do the following to get puppeteer working. This is straight from my docs, but I had to hand-jam the contents because my docs are on an intranet.
I had to install all of these libraries manually. I also don't know what the Arch Linux equivalents are. Some are duplicates from your question, but I don't think they all are:
pango
libXcomposite
libXcursor
libXdamage
libXext
libXi
libXtst
cups-libs
libXScrnSaver
libXrandr
GConf2
alsa-lib
atk
gtk3
ipa-gothic-fonts
xorg-x11-fonts-100dpi
xorg-x11-fonts-75dpi
xorg-x11-utils
xorg-x11-fonts-cyrillic
xorg-x11-fonts-Type1
xorg-x11-fonts-misc
liberation-mono-fonts
liberation-narrow-fonts
liberation-narrow-fonts
liberation-sans-fonts
liberation-serif-fonts
glib2
If Arch Linux uses SELinux, you may also have to run this:
setsebool -P unconfirmed_chrome_sandbox_transition 0
It is also worth adding dumpio: true
to your options to debug. Should give you a more detailed output from puppeteer, instead of the generic error. As I mentioned in my comment. I have this option ignoreDefaultArgs: ['--disable-extensions']
. I can't tell you why because I don't remember. I think it is related to this issue, but also could be related to my corporate proxy.
QUESTION
The code I work on has a substantial amount of floating point arithmetic in it. We have test cases that record the output for given inputs and verify that we don't change the results too much. I had it suggested that I enable -march native to improve performance. However, with that enabled we get test failures because the results have changed. Do the instructions that will be used because of access to more modern hardware enabled by -march native reduce the amount of floating point error? Increase the amount of floating point error? Or a bit of both? Fused multiply add should reduce the amount of floating point error but is that typical of instructions added over time? Or have some instructions been added that while more efficient are less accurate?
The platform I am targeting is x86_64 Linux. The processor information according to /proc/cpuinfo
is:
ANSWER
Answered 2021-Nov-15 at 09:40-march native
means -march $MY_HARDWARE
. We have no idea what hardware you have. For you, that would be -march=skylake-avx512
(SkyLake SP) The results could be reproduced by specifying your hardware architecture explicitly.
It's quite possible that the errors will decrease with more modern instructions, specifically Fused-Multiply-and-Add (FMA). This is the operation a*b+c, but rounded once instead of twice. That saves one rounding error.
QUESTION
I have a query which gives me the Manager and Inititials from a specific department, and I need to get the DISTINCT Manager which is also in the query result .. let me elaborate:
My initial Query:
...ANSWER
Answered 2021-Oct-08 at 08:50A self semi join of your results should do the trick:
QUESTION
I want to find this icon with transparent background
in this image
I tried the following code:
...ANSWER
Answered 2021-May-27 at 10:58Please notice, that cv2.matchTemplate
has a mask
parameter, where you can set up a mask for the template, which would be the alpha channel of your template (small image). Further, keep in mind to feed image (large image) and template (small image) in that order to cv2.matchTemplate
:
QUESTION
I compile a sample code in following:
...ANSWER
Answered 2021-Apr-02 at 18:01On "mainstream" CPUs like Skylake-X and IceLake, it's only worth using 512-bit vectors at all if you use them consistently for a lot of your program's run-time, not just for an occasional memcpy. See SIMD instructions lowering CPU frequency for the details: you don't want occasional calls to memcpy to hold your CPU frequency down to a lower max turbo.
Using AVX-512 features with 256-bit vectors (AVX-512VL) can be worth it for some things, e.g. if masking is nice, or if you use YMM16..31 to avoid VZEROUPPER.
I'd guess that glibc would only resolve memcpy to __memcpy_avx512_no_vzeroupper
on systems like Knight's Landing (KNL) Xeon Phi, where the CPU is designed around AVX-512, and there's no downside to using 512-bit ZMM vectors. There's no need for vzeroupper even after using ymm0..15 on KNL. In fact vzeroupper is very slow on KNL, and definitely something to avoid, hence putting no_vzeroupper
in the function name.
https://code.woboq.org/userspace/glibc/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S.html is the source for that version. It uses ZMM vectors, including ZMM0..15, so if used on a Skylake/IceLake CPU it should use vzeroupper. This version looks designed for KNL.
There would be some tiny benefit to having an AVX-512VL version that used ymm16..31 to avoid vzeroupper (to speed 32 .. 64 byte copies), without ever using ZMM registers.
And it would make sense for __memcpy_avx512_no_vzeroupper
to only use ZMM16..31 so avoiding vzeroupper isn't a problem on mainstream CPUs; then it would be a usable option in code that already made heavy use of AVX-512 (and thus was already paying the CPU-frequency cost.)
QUESTION
I'm writing a C++ program that shall solve PDEs and algebraic equations on networks. The Eigen library shoulders the biggest part of the work by solving many sparse linear systems with LU decomposition.
As performance is always nice I played around with options for that. I'm using
...ANSWER
Answered 2021-Mar-04 at 21:58There are plenty of reasons why a code can be slower with -march=native
, although this is quite exceptional.
That being said, in your specific context, one possible scenario is the use of slower SIMD instructions, or more precisely different SIMD instructions finally making the program slower. Indeed, GCC vectorize loops with -O3
using the SSE instruction set on x86 processors such as yours (for backward compatibility). With -march=native
, GCC will likely vectorize loops using the more advanced and more recent AVX instruction set (supported by your processor but not on many old x86 processors). While the use of AVX instruction should speed your program up, it is not always the case in few pathological cases (less efficient code generated by compiler heuristics, loops are too small to leverage AVX instructions, missing/slower AVX instructions available in SSE, alignment, transition penality, energy/frequency impact, etc.).
My guess is your program is memory bound and thus AVX instructions do not make your program faster.
You can confirm this hypothesis by enabling AVX manually using -mavx -mavx2
rather than -march=native
and look if your performance issue is still there. I advise you to carefully benchmark your application using a tool like perf
.
QUESTION
I am doing some parallelization for a school assignment. Converting pictures to grayscale. But ever since I implemented multiprocessing.Array
, I am getting terrible results. Even worse with increasing number of processors.
The speed was fine and as expected, when I was inputing the results into numpy array (but obviously I did not get a valid picture with that). But ever since I switched to the mp Array, it got this sluggish, but I got nice grayscale pictures from it.
I also tried implementing this with processexecutor, but it froze when I passed the mp Array as an argument (did not even reach pid print which was on the first line of the called function)
The Code:
...ANSWER
Answered 2021-Mar-02 at 21:57Every time you access a shared memory component like multiprocessing's Array, you necessarily engage some inter-process communication. This is slower than normal memory access, of course, and to make matters worse, it tends to lock the array, meaning your workers are mostly locking on each other, and not doing real work.
If instead of sending one pixel at a time, if you batch up the results, you can speed things up. For instance, if you change to a model of listing what pixels need to be updated, and have your main worker do the actual work of updating the target array:
QUESTION
I have been trying to get docker to pull from a private nuget feed which is hosted within Azure Devops, but I consistently get a 401 unauthorized error. I have looked a numerous other answers and resources, but all of which have not helped. My dockerfile script is the following
...ANSWER
Answered 2020-Dec-09 at 20:29You can check out below workarounds without using NuGet credential plugin.
1, Use dotnet cli to add credentials to the nuget source in your docker file. And then pass the $PAT in the build arguments (ie. --build-arg PAT=$PAT )
:
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