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QUESTION
I have to do an exercise were I got h.264 video sender host, h.264 video receiver (with background traffic receiver) host, and a background traffic generator host. All of these three are on different ip subnet connected to P4 controller.
...ANSWER
Answered 2021-Jun-15 at 17:48Yes I can see what you mean, I have done this integration before you only forget the priority statement otherwise should run well, please add this to your code;
after
apply { ipv4_lpm.apply();
ADD:
QUESTION
I'm trying to optimize requests through an external proxy (rotator). Sometimes the response is fast, sometimes very slow. So the idea is to send multiple requests in parallel of the same url request, take the fastest response, return the data, close the function without waiting for the other slower response(s).
There are a lot of tutorials online and SO questions regarding parallel requests in python, but all of them are for parallel requests of different requests instead of a duplicate request. Additionally the code waits until all requests are finished. I want to kind kill the parallel requests logic (preferably in a clean way) once the fastest response answers.
My app is running in Python Flask and runs with Gunicorn + Eventlet. I tried Eventlet green pools and Python Concurrent Futures, but using an Eventlet Greenpool seems like a better match, since the code will run in Gunicorn + Eventlet workers and Celery with Eventlet workers.
Im currently using Luminati Proxy Manager (LPM) to retry failed requests. An older version seemed to support parallel requests in the box, but the current versions do not support this function anymore. So I'm either trying to solve it with code in my Python app, or add another service/ tool (like LPM) that takes care of parallel requests and picks the fastest one.
Proxy service Luminati.io provides a 'high performance parallel request' code example (based on Eventlet Greenpool). See 'original example'
I edited to code without a proxy and login's to make it more repeatable and avoid unpredictable proxy response timings. I'm not getting any support from Luminati, so I'm trying figure it out on SO. For this test I'm using simulated slow 5 sec response, and a fast response from httpstat.us:
...ANSWER
Answered 2021-Apr-02 at 03:15I was overcomplicating things and figured out that the easiest way was to send the parallel url requests through multiple tasks in a Celery background worker (which I was using already). The Celery background worker uses Eventlet and multiple workers to handle a lot of concurrent tasks (especially with a lot of I/O wait time)
Using the code below I'm calling a Celery task twice with the same URL. Check every x millisecond if one of the requests is ready. If so, take the first finished request and cancel the other Celery task. The only limitation of this setup using Eventlet that Celery does not support terminating a task completely when it is running using Eventlet. In the future, I might want to improve this by using a key in Redis to let both parallel tasks check if the other one is finished. If that is true the remaining task can be canceled.
QUESTION
i'm doing a code in C for stm32 with LoRa-02, and i came across a weird error.
error:
expected declaration specifiers or '...' before '(' token
A part of a code:
txt:
...ANSWER
Answered 2020-Oct-31 at 13:57This fragment of the compiler output reveals the nature of the problem (or at least one problem):
QUESTION
I am new to DPDK, currently testing IP reassemble API and I am having difficulties. Below is the C++ code which I wrote to test the IP reassemble. I took the reference from the examples list provided from dpdk itself. dpdk version which I am using is 20.08 in debian machine. dpdk user guide mentions the API works on src add, dst add and packet ID, even though all three data are proper still the API returns NULL. Any kind of help will be much appreciated. Thanks in advance.
...ANSWER
Answered 2020-Oct-22 at 09:27DPDK API rte_ipv4_frag_reassemble_packet returns NULL in 2 ocassion
- an error occurred
- not all fragments of the packet are collected yet
Based on the code and logs shared it looks like you are
- sending the last fragment multiple times.
- setting time out as
cur_tsc
Note:
- the easiest way to test your packet is run it against
ip_reassemblyexample and cross check the variance. if (mo == NULL)it only means not sufficient fragments are received.
[edit-1] Hence I request to model your code as dpdk example ip_reassembly since assuming rte_ipv4_frag_reassemble_packet returning NULL is not always a failure.
[edit-2] cleaning up the code and adding missing libraries I am able to get this working with right set of fragment packets
QUESTION
I'm creating images for iMX chipsets and had downloaded the sources from NXP, and then created a core-image-minimal using Yocto. I then proceeded to sucessfully boot the image in a board.
After that, my interest was to apply the EVL project on an image. I did the following:
- Download the sources from EVL Core. Those sources consist of a Kernel with EVL on top of it.
- Created a workspace folder using devtool, and added the folder linux-imx, which contains the code for the kernel.
- Completely replaced the contents of the folder for those of EVL. The rest of Yocto files remained unchanged.
- Rebuilt the image and flashed it.
However, when booting, I get the following message:
...ANSWER
Answered 2020-Sep-08 at 07:16As said in the comments, the problem was the following:
I couldn't find the folder plat-imx because it was not in the Kernel folder, but rather in the OP-TEE folder.
OP-TEE, which is a safety environment, runs before the boot checking the device tree and updating some memory addresses based on that.
Since the device tree had changed, he was now unable to find some elements and therefore it crashed before boot.
After adding some missing files to the DTS folder, the Bootloader worked correctly. Other problems during boot due to the kernel change appear remain to be solved.
QUESTION
I have an XML file which has a 3 level deep XML tree. I want to extract all the tags from that tree. The challenge here is that tree is dynamic and can be any level deep.
I have already extracted the root node and I have two methods at my disposal:
-> XmlUtil.getChildNodes(Node node,"name of the child") ~~ returns a list of child nodes from the parent node.
...ANSWER
Answered 2020-Jul-06 at 10:39import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import java.io.File;
import java.util.Map;
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("C:\\Users\\rishabh.awatani\\Downloads\\something.xml");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(file);
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "//link";
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
for(int i = 0; i " + nodeMap.getNamedItem("value").getNodeValue());
}
}
}
QUESTION
I am trying to implement multinomial regression (mlogit or multinom package) in R with Codes and optim (Not using packages).
...ANSWER
Answered 2020-Sep-01 at 10:23Not very familiar with your svm optimization or what you are trying to do, the error you have comes with optim working with a vector. You need to coerce it into a matrix inside the function, let's say your data is like this:
QUESTION
how can I get the id, and in turn the value of the v-text to save it in a table
I want to save the id of the malla_curricular table in the field idMalla and the value of the fields pAcademicoInicio cicloLectivoInicioin the field periodoLectivoMallaOrigen of the table estudio_reingreso
ANSWER
Answered 2020-Jan-31 at 03:07(I am assuming that you already fetched the data for arrayPeriodo)
If this is how you structured your data, then you can access the malla_selected object from which will contain what you say is :value in your option tag.
template:
QUESTION
We have a product that uses an MSP430F5436A. It has been in production for several years. Over the past several months we have had reports from production that a few units are not shutting down completely, their power LED is staying on. The power LED is driven by an I2C GPIO expander, it's not connected directly to the MSP430.
When the user hits the power button the MSP430 is supposed to shut down a lot of peripherals, turn off the power LED, and enter LPM2. Periodically a timer interrupt wakes it up from LPM2 to check to see if the power button has been hit to turn the device back on and to do some other house keeping.
After the user hits the power button there is a delay before the device powers off which is driven via a timer ISR. I ripped that out and put in a delay loop. Within that delay loop I am rapidly toggling a different LED that is connected directly to the MSP430.
If I make the loop duration shorter than two seconds the device is able to get into LPM successfully and the LED stops toggling. If I set the loop longer than two seconds I can observe the lock up behavior I am seeing. Sometimes the LED is left in an on or off state, that is random.
I have attempted to disable all maskable interrupts prior to entering the loop. That had no effect. I also put code in the SYSNMI and UNMI vectors to detect if either of those were firing and neither is firing. Also, there is no RTOS, this is a cooperative multi-tasking system. So it seems to be locking up while executing the loop its self.
Eventually my device reboots from this lockup but it is due to a watchdog reset. I print the reset source at startup. The device also recovers if I pull out and reinsert the battery. However, the device stays in a locked up state if I pull the reset line low. I also have trouble JTAGGing firmware onto the device once it is locked up.
I've looked in the errata for the MSP430F5436A for mentions of lock up behavior and the only mention isn't relevant.
Unfortunately, due to the packing and construction of the device it is difficult to probe some of the nets, but not impossible.
I can connect to the device with a debugger, but the debugger (CCS 7 + MSP-FET430UIF) looses its connection with the device shortly after the device starts running. That is something that is always true and is a design issue. We have frequent timer interrupts occurring so this behavior may not be avoidable.
The power source for the device is stable and it is operating on my bench and not in a high EMI/EMF environment. However, when this loop occurs some peripherals and power supplies would have been shut down. So it is possible some sort of anomaly is occurring on one of the MSP430's power rails or a GPIO pin.
What could be causing this lock up behavior? Are there any persistent registers I can read on reset that would give me a clue, or are there any pins/nets I can probe that would give me a clue?
Update: I have probed VCC for the MSP430, rails that power peripherals the MSP430 is connected to, and the reset line. I see no changes on any of these at the time of the lock-up.
Edit: The following is the delay loop that I added
...ANSWER
Answered 2020-Jan-29 at 16:19I incorrectly assumed that the hang was occurring within my delay loop because interrupts were disabled, and that the loop wasn't completing. It turns out the loop is running to completion, and after interrupts are enabled an ISR is entered for an event that occurred during the execution of the loop. The hang occurs in that ISR.
Shortly after the delay loop (in time, but somewhere else altogether in code) a GPIO interrupt is disabled. When I power down the device a peripheral that is holding a pin high is shut off, and that pin eventually drops. If I make the delay loop short the loop is exited and that particular interrupt is disabled before the pin drops. If the delay loop is long the pin drops and when the GIE bit is reset by __enable_interrupt(); a context switch to that GPIO interrupt begins.
QUESTION
When I run a mean LPM optimization I get the following error:
Error in match.fun(spec@model$param$tau) : 'spec@model$param$tau' is not a function, character or symbol
I have already set the estimator to lpmEstimator and type to LPM. Anyone know how I can fix this?
ANSWER
Answered 2019-Dec-09 at 09:44As you can see in getAnywhere("lpmEstimator") it is necessary to specify parameters for fAssets::assetsLPM that is used to get the estimations.
This works here:
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