threads.js | 🧵 Make web workers & worker threads | Key Value Database library
kandi X-RAY | threads.js Summary
kandi X-RAY | threads.js Summary
🧵 Make web workers & worker threads as simple as a function call.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of threads.js
threads.js Key Features
threads.js Examples and Code Snippets
License : Strong Copyleft (CC BY-SA 4.0)
Copyn = 4 # number of cores
m = 1 # number of threads per core
TOTAL_MEMORY = 16282416 kB
TOTAL_MEMORY * min(1, 1 / 4)
> 4070604
class Example {
private final AtomicReference> mapRef = new AtomicReference<>(someInitialState);
private void consumerThread() {
// Get the current version of the map and look up a value from it.
String vaimport java.time.Instant;
import java.util.concurrent.*;
public class ConcurrencyTest
{
private final ConcurrentMap processItems = new ConcurrentHashMap<>();
public String process()
{
return processItems.compute Thread t = new Thread(() -> {
...code to be executed in the new thread goes here...
});
t.start();
...do other stuff concurrently with the new thread...
try {
t.join();
} catch (InterruptedExceptipublic class IPCheckService
{
private readonly IServiceProvider _serviceProvider;
private DateTime _lastUpdateTime;
private List _IPBlackList = null;
public IPCheckService(IServiceProvider serviceProvider)
if (index & 1)
//perform odd function
else
//perform even function
__global__ void even_kernel(float* A, int N)
{
int i = threadIdx.x*2;
if (i < N) {
float x = A[i];
x = public void run(){
for(int j = 0; j < array[low].length; j++){
if (found) {
break;
}
if(array[low][j] == 0){
// lock,check,act
// if found, lock
// array here cgit rev-list --objects --all |
git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' |
sed -n 's/^blob //p' |
sort --numeric-sort --key=2 |
cut -c 1-12,41- |
$(command -v gnumfmt || echo numfmt) --field=2
parallel="methods": TestNG will run all your test methods in separate threads. Dependent methods will also run in separate threads but they will respect the order that you specified.
parallel="tests": TestNG will run all the methods[gerrit]
autoReload = true
replicateOnStartup = true
[remote "GitLab-All-Projects"]
projects = All-Projects
projects = All-Users
url = gitlab@gitlab.local:external-tools/gerrit-${name}.git
push = +refs/*:refs/*
Community Discussions
Trending Discussions on threads.js
QUESTION
I have this really messy code (first thing I do in Python) that IMO should work but it dosn't.
...ANSWER
Answered 2021-Jan-04 at 02:53That is because inside the on_ready() function, threadp is a local variable. Just add this to the function and it should work:
QUESTION
As I mentioned in the title, I'm having trouble setting the Thread object as JSON value. The program gives me TypeError. Here's my code:
ANSWER
Answered 2020-Aug-26 at 06:03JSON is a very generic way of serializing all sorts of stuff. However, to do that, it uses a technique called "reflection". This will only work with objects that have a known structure, i.e. in Python it must be a Python object, in C# it must be a C# object.
As soon as you leave the programming language, this generic way of serialization is no longer possible. In this case, a thread is an object that is near the kernel, so it's likely implemented in C or C++ and thus not serializable. The same applies for other stuff that is optimized for performance, e.g. numpy, which also uses C++ for its implementation.
To deal with that issue, don't serialize the object directly but serialize all information that is needed to re-create the object from scratch again. For numpy, you would convert numbers into Python numbers. For your thread, serialize the name.
My expectation from the program is [...]
QUESTION
I'm trying to start a thread on Sapper using the nodejs worker_threads, but it looks like it's trying to start also another instance of Polka.
You can find my code on this repo, but it basically has a route to http://localhost:3000/worker that fetches the server-side worker\run.js. It calls the worker.js that has the worker_threads logic.
The run.js calls the main() function on worker.js and creates a new thread that re-loads itself inside a worker thread instance, this time matching the if (!isMainThread) {...} condition, executing the console.logs (I tried other uses and the same problem appeared).
ANSWER
Answered 2020-Jun-06 at 02:19To solve this, at least on sapper v0.27.0, I added the file I wanted to be executed as a thread in the server.input on rollup.config.js:
QUESTION
I'm using this repo to create a chat system between 2 users in a Rails and React project. I've been able to log the user input into the console, and I have created messages_controller and message_threads_controller according to the repo.
However, I'm unable to persist the message to Rails db and then authenticate a user with Pusher before sending it to Pusher. Mainly because the from_uid, to_uid and thread_uid are not present by the time the message is been sent to Rails. Sending the message to rails like this:
...ANSWER
Answered 2018-Jan-30 at 21:55Answer from the author of the git repo.
The example I created here was pretty bare bones but below are a few bullet points that I hope will explain how you could expand on it.
- Add a User model and Thread model to the Rails app
- When a User is created, generate a public UID for the user (you can use Ruby's built-in
SecureRandom.uuidto generate the id) and save that to the DB. This would become the ID for that user that you would expose in your javascript to allow for communications between users. All users would have a UID. - When a Thread is Created, generated a thread UID this would become the unique id for the conversation taking place
- Add a Users_Threads
has_and_belongs_to_manyrelationship so that you can eventually track the users that are subscribed to which threads - When React app loads, use an Ajax request to get a list of the current User's friends (returns list of user details + their uid) and a request to get all threads for current User
- So let's say for example a User named Fred clicked on a User named Bob and wanted to send Bob a message but they do not currently have a thread. Fred types the message, clicks Submit and you send an Ajax request containing the message text, from_uid (Fred) and to_uid (Bob) with thread_uid as null (since there is no existing convo and no existing thread).
- Your Rails app then receives that requests at a controller and sees that Fred is trying to send Bob a message and the thread ID is null, so the controller create a new thread (with its own UID) and then add two entries to users_threads one for the new thread_uid and bob's uid and another for the new thread_uid and Fred's uid. After that, you'd create a Message with that thread_uid and the participant details.
You'd also probably want users to see that they are part of a new thread without having to reload the page so you'd I think you'd want a Pusher channel subscription just for notifying users of a new thread. So I'd say in the UserThreads model after create a new thread you could send something like Pusher.trigger('threads_channel', user_secret_uid, { thread: new_thread_uid }). You'd also need to make sure in the react app that each user subscribes to the threads_channel for their user_secret_uid. For security, i'd make sure this is a different uid than the messaging otherwise people could subscribe to a list of a different users threads.
QUESTION
Linux perf-tools are great for finding hotspots in CPU cycles and optimizing those hotspots. But once some parts are parallelized it becomes difficult to spot the sequential parts since they take up significant wall time but not necessarily many CPU cycles (the parallel parts are already burning those).
To avoid the XY-problem: My underlying motivation is to find sequential bottlenecks in multi-threaded code. The parallel phases can easily dominate the aggregate CPU-cycle statistics even though the sequential phases dominate wall time due to amdahl's law.
For java applications this is fairly easy to achieve with visualvm or yourkit which have a thread-utilization timelines.
Note that it shows both thread state (runnable, waiting, blocked) and stack samples for selected ranges or points in time.
How do I achieve something comparable with perf or other native profilers on linux? It doesn't have to be a GUI visualization, just a way to find sequential bottlenecks and CPU samples associated with them.
...ANSWER
Answered 2018-Nov-09 at 17:06You can get the result you want using a great tool we use to analyze Off-CPU Analysis - Off-CPU Flame Graphs which is apart of Flame Graphs
I used the Off-CPU analysis
Off-CPU analysis is a performance methodology where off-CPU time is measured and studied, along with context such as stack traces. It differs from CPU profiling, which only examines threads if they are executing on-CPU.
This tool is based on the tools you mentioned as the preferred ones - perf, bcctools, however, it provides a really easy to use output called flame graph which interactive SVG file looks like this SVG Off-CPU Time Flame Graph.
The width is proportional to the total time in the code paths, so look for the widest towers first to understand the biggest sources of latency. The left-to-right ordering has no meaning, and the y-axis is the stack depth.
2 more helpful analysis which are part of the Off-CPU Flame Graphs can also help you - Personally, I did not tried them.
This lets us solve more problems than off-CPU tracing alone, as the wakeup information can explain the real reason for blocking.
And Chain Graph
Chain graphs are an experimental visualization that associates off-CPU stacks with their wakeup stacks
There is also an experimental visualization which combines both CPU and Off-CPU flame graphs Hot/Cold Flame Graphs
This shows all thread time in one graph, and allows direct comparisons between on- and off-CPU code path durations.
It requires a little time to read about this profiling tool and understands its concepts, however, using it is super easy and its output is easier to analyze than other tools you mentioned above.
Good Luck!
QUESTION
I have a React/redux/electron app that uses Google Oauth. I want to be able to refresh the access token automatically when it expires. I've researched this and solved it semi-successfully using middleware, but my solution is erroring in certain situations.
I've implemented a refresh middleware that runs on every API action. It checks whether the access token is expired or about to expire. If so, instead of dispatching the action it received, it dispatches a token refresh action and queues up any other actions until a new access token is received. After that, it dispatches all actions in its queue.
However, one of my action creators looks something like this:
...ANSWER
Answered 2018-Sep-12 at 19:38It looks like I've solved the issue by rewriting the refresh middleware like this:
QUESTION
I have a recipe model:
ANSWER
Answered 2018-Mar-08 at 19:00Give a try to .annotate() and then ordery by this newly annotated attribute.
see here: https://docs.djangoproject.com/en/2.0/ref/models/querysets/#annotate
QUESTION
I deployed broadleaf demo site on standalone tomcat server with mysql as backend and standalone solr server. I can access the solr server on 8983 port. I see that my cores are available at http://localhost:8983/solr/#/catalog and catalog_reindex (note the hash in url). I changed the common-shared.properties file to point to right URL but when I try to hit the SiteApplication, I get following error
...ANSWER
Answered 2018-Mar-10 at 20:39This is something that has to do with the indexing phase in Solr.
I bet that if you have a look at Solr logs you will find some error (e.g. missing required field, multiple values for a non multivalued field)
Andrea
P.S. I don't know Broadleaf commerce but, the URL you should configure in the admin panel shouldn't have the # symbol, this is only valid in the admin console, which is implemented using AngularJS (that's the reason why the URL looks like that)
QUESTION
Recently I use BTrace to check exceptions that are thrown inside glassfish VM. I use script:
...ANSWER
Answered 2018-Feb-02 at 14:21I finally found out whats going on - looking again on this Ex:
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