netpoll | performance non-blocking I/O networking framework
kandi X-RAY | netpoll Summary
kandi X-RAY | netpoll Summary
Netpoll is a high-performance non-blocking I/O networking framework, which focused on RPC scenarios, developed by ByteDance. RPC is usually heavy on processing logic and therefore cannot handle I/O serially. But Go's standard library net is designed for blocking I/O APIs, so that the RPC framework can only follow the One Conn One Goroutine design. It will waste a lot of cost for context switching, due to a large number of goroutines under high concurrency. Besides, net.Conn has no API to check Alive, so it is difficult to make an efficient connection pool for RPC framework, because there may be a large number of failed connections in the pool. On the other hand, the open source community currently lacks Go network libraries that focus on RPC scenarios. Similar repositories such as: evio, gnet, etc., are all focus on scenarios like Redis, HAProxy. But now, Netpoll was born and solved the above problems. It draws inspiration from the design of evio and netty, has excellent Performance, and is more suitable for microservice architecture. Also Netpoll provides a number of Features, and it is recommended to replace net in some RPC scenarios. We developed the RPC framework Kitex and HTTP framework Hertz (coming soon) based on Netpoll, both with industry-leading performance. Examples show how to build RPC client and server using Netpoll. For more information, please refer to Document.
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QUESTION
I'm having a problem downloading large files from an AWS S3 bucket using the golang client, I'm not an expert with golang so I would appreciate any help.
I'm creating a simple API that expose an endpoint using gin-gonic framework, when someone sends a request to that endpoint the app download a huge CSV file from an AWS S3 bucket and save the contents of the file in a local DB.
When the file size is 200 mb it works correctly but with bigger files, say 500 mb, I start getting out of memory errors.
I'm using this portion of code to create the session and donwload the file:
...ANSWER
Answered 2021-Mar-31 at 10:19By using the downloader you are unable to process the file while it is downloading: it downloads different chunks concurrently so you do not receive the bytes in order.
If you want to process the bytes as you download them, you can try using s3.S3 instead. This downloads the object in order, but only uses a single goroutine so will be slower.
Something like:
QUESTION
I am trying to write a simple go test as follows
...ANSWER
Answered 2020-Mar-24 at 08:09TerraformDir option should be set to a folder path and not a file path.
QUESTION
I'm running lambda using the aws-sdk-go-v2 but running into memory issues when downloading larger files. I've tried all sorts of combinations of partSize and concurrency but I either hit the timeout when setting concurrency to a small number or hit an out of memory issue.
Does anyone know how to fix this or a better or other way of downloading files from S3 using go?
...ANSWER
Answered 2020-Jan-24 at 21:53Try to set slice len/cap:
QUESTION
I had created a test program to check my understanding of how Golang handles Network IO. The below program creates 1000 goroutines and in each goroutine, it will make a Network IO request.
When I tried to monitor the number of threads getting used, it goes up to 400 Threads. I had used the top command to monitor, My understanding is for network io Golang uses netpoll(i.e async io).
Please correct me if my understanding is wrong.
OS: macos high sierra
Go version: go1.11.2 darwin/amd64
...ANSWER
Answered 2018-Dec-31 at 14:34When a thread is blocked on a system IO call, Go may create a new thread to allow other goroutines to continue to run. This has a good explanation: https://povilasv.me/go-scheduler/:
Interesting things happen when your goroutine makes a blocking syscall. Blocking syscall will be intercepted, if there are Gs to run, runtime will detach the thread from the P and create a new OS thread (if idle thread doesn’t exist) to service that processor.
So, instead of having a handful of threads and utilizing 0% of your CPU because all the threads are tied up waiting on a blocking syscall to return, instead it sets those threads aside and spins up new threads so non-blocked goroutines can do their work while it waits for the blocking syscall(s) to return.
QUESTION
I am working with go and redis to dispatch a queue (channel) of messages to subscribers. I am aiming to create an auto scaling solution that will spawn new go routines (within a certain limit) as the queue gets larger. I have the below code:
...ANSWER
Answered 2018-May-04 at 10:59Based on this
I can see from other testing I'm running that this isn't just going slowly and that the messages just aren't being taken from the channel.
I think you have a live lock in addRedisSender()
The select statement will pseudo randomly select one of the cases, either the killSwitch case, or the <-messageChannel. Except there's also another case, the default. This will always be true, meaning the for { loop will spin for ever consuming all the resources and causing a live lock as the go runtime tries to schedule more and more competing go routines.
If you remove the default: continue case then the for loop will block on the select until there's a message to read, or a kill signal.
QUESTION
After pulling an image from docker hub docker images list won't list the image and i receive a fatal error: fault on docker images command
ANSWER
Answered 2018-Jun-20 at 23:47The issue is it conflicted with an old docker installed via brew. That's why there's a lot of mention of "Cellar" in the output. Once i uninstalled the brew version of docker the commands worked and the images listed as expected.
QUESTION
I'm need to create a loadable kernel module which sends data to another remote computer.
I'm writing to 4.10 kernel.
I tried the netpoll API but all I got was errors and I can't find any new and up-do-date information about socket programming inside the kernel.
can anyone give my an example (or any directions) to it?
ANSWER
Answered 2017-Oct-17 at 09:44As I tried to find the solution by using netpoll, I found that using socket might be more useful. I found this link of a github repository that have exactly the example of echo client server in the linux kernel.
Hope it will help everyone who searched for it too.
QUESTION
As visible in the official documentation as well as almost everywhere else online, the common pattern for handling http client errors is the following:
...ANSWER
Answered 2017-Sep-26 at 14:26Yes, they can both be non-nil in one situation, apparently. From the source, we see:
QUESTION
I have a heavy traffic server(more than 800K qps) with go1.7.
From http://urltoserver:debugport/debug/pprof/goroutine?debug=2 I see 8K goroutines out of which almost 1800 are in IO wait for minutes. One of such goroutine stack is as below.
...ANSWER
Answered 2017-Feb-15 at 14:37These could easily be clients the initiated a request but never completed it or slow clients etc.
You should configure the Read/Write timeouts of your server (server.ReadTimeout and server.WriteTimeout respectively):
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