wolff | Lightweight and easy to use framework | Web Framework library
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kandi X-RAY | wolff Summary
Lightweight and easy to use framework for building web apps.
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QUESTION
I have the problem that when I build the project at my place no errors occur. However, when I do this through my configured GitHub workflow, the following error occurs:
...ANSWER
Answered 2020-Aug-27 at 22:26According to the Qualys SSL tester, this server only supports TLS 1.3. That means that your older versions of Java, which support TLS 1.2, but not TLS 1.3, won't work.
If you control that server, I'd suggest re-adding support for TLS 1.2. While TLS 1.3 is awesome, TLS 1.2 is still considered robust and secure and is a fine choice, so there's no reason to disable it right now. If you don't, you'll need to either work with the owners or find an alternative.
QUESTION
Recent Intel processors provide a hardware feature (a.k.a., Precise Event-Based Sampling (PEBS)) to access precise information about the CPU state on some sampled CPU events (e.g., e). Here is an extract from Intel 64 and IA-32 Achitecture's Software Developer's Manual: Volume 3:
18.15.7 Processor Event-Based Sampling (PEBS)
The debug store (DS) mechanism in processors based on Intel NetBurst microarchitecture allow two types of information to be collected for use in debugging and tuning programs: PEBS records and BTS records.
Based on Chapter 17 of the same reference, the DS format for x86-64 architecture is as follows:
The BTS Buffer records the last N executed branches (N is dependent on the microarchitecture), while the PEBS Buffer records the following registers:
IIUC, a counter is set and each event (e) occurrence increments its value. When the counter overflows, an entry is added to both of these buffers. Finally, when these buffers reach a certain size (BTS Absolute Maximum and PEBS Absolute Maximum), an interrupt is generated and the contents of the two buffers are dumped to disk. This will happen, periodically. It seems that the --call-graph dwarf backtrace data is also extracted in the same handler, Right?
1) Does this mean that LBR and PEBS (--call-graph --lbr) state, perfectly, match together?
2) How about the --call-graph dwarf output, which is not part of PEBS (as seems obvious in the above reference)? (Some RIP/RSPs do not match the backtrace)
Precisely, here is an LKML Thread, where Milian Wolff shows that the second question is, NO. But I do not fully understand the reason?
The answer to the first question is also, NO (expressed by Andi Kleen in the latter messages of the thread), which I do not understand at all.
3) Does this mean that the whole DWARF call-graph information is completely corrupted?
The above thread does not show this, and in my experiments I do not see any RIP not matching the backtrace. In other words, can I trust the majority of the backtraces?
I do not prefer the LBR method which may, itself, be imprecise. It is also limited in the size of the backtrace. Although, here is a patch to overcome the size issue. But this is recent and may be bogus.
UPDATE:
- How is it possible to force
Perfto store only a single record inPEBS Buffer? Is it only possible to force this configuration, indirectly, e.g., when call-graph information is required for aPEBSevent?
ANSWER
Answered 2020-Apr-19 at 03:541) The section of the manual you quoted talks about BTS, not LBR: they are not the same thing. Later in that same thread you quoted, Andi Kleen seems to indicate that the LBR snap time is actually the moment of the PMI (the interrupt that runs the handler) and not the PEBS moment. So I think all three stack approaches have the same problem.
2) DWARF stack captures definitely do not correspond exactly to the PEBS entry. The PEBS event is recorded by the hardware at runtime, and then only some time later is the CPU interrupted, at which point the stack is unwound. If the PEBS buffer is configured to hold only a single entry, these two things should at least be close and if you are lucky, the PEBS IP will be in the same function that is still at the top of the stack when the handler runs. In that case, the stack is basically correct. Since perf shows you the actual PEBS IP at the top, plus the frames below that from the capture, this ends up working in that case.
3) If you aren't lucky, the function will have changed between the PEBS capture and the handler running. In this case you get a franken-stack that doesn't make sense: the top function may not be callable from the second-from-the-top function (or something). It is not totally corrupted: it's just that everything except the top frame comes from a point after the PEBS stack was captured, and the top frame comes from PEBS, or something like that. This applies also to --call-graph fp, for the same reasons.
Most likely you never saw an invalid IP because perf shows the IP from the PEBS sample (that's the theme of that whole thread). I think if you look into the raw sample, you can see both the PEBS IP, and the handler IP, and you can see they usually won't match.
Overall, you can trust the backtraces for "time" or "cycle" profiling since they are in some sense an accurate sampling representation of execution time: it's just that they don't correspond to the PEBS moment but some time later (but why is that later time any worse than the PEBS time). Basically for this type of profiling you don't really need PEBS at all.
If you are using a different type of event, and you want fine-grained accounting of where the event took place, that's what PEBS is for. You often don't need a stack trace: just the top frame is enough. If you want stack traces, use them, but know they come from a moment in time a bit later, or use --lbr (if that works).
QUESTION
I am working on a physics simulation. I am actually trying to implement a cluster Wolff algorithm for the Ising model. This deals with mainly manipulation of NumPy arrays on the programming side. I want to make a plot of specific heat,energy, magnetization with temperature. For different temperatures, the simulations are entirely independent. So,I tried to parallelize the operation with the numba prange function. But it is not allowing it. The reason seems another function that I am calling from my main function.
My code is here:
...ANSWER
Answered 2020-Apr-09 at 20:59Parallelization is normally the last thing to consider. At best you can gain a bit less than the number of cores available (usually less than a order of magnitude). There are quite a lot features not available, usually its best to keep it as simple as possible (and does the job here)
When using Numba it is in most cases recommendable to get rid of any global variables, which could lead to hard to debug errors or very time consuming recompilation of the code. Actually there are no real global variables, instead they are hard-coded in the compiled function.
Example
QUESTION
I have a Mongoose schema/model with a property of completedSetup that is a Date type.
Project repo: https://github.com/rmgreenstreet/custom-forms
...ANSWER
Answered 2020-Apr-07 at 22:04As usual, I feel dumb now that I've found the issue.
The problem was in the getPoints function.
It was treating every item in every sub-array it received as a point, and creating a point for it. So if the graphDatasets looked like:
QUESTION
I am working on a simulation problem written in c, the main part of my program is a recursive function. when the recursive depth reaches approximately 500000 it seems stack overflow occurs.
Q1 : I want to know that is this normal?
Q2 : in general how many recursive function calls causes stack overflow?
Q3 : in the code below, removing local variable neighbor can prevent from stack overflow?
my code:
...ANSWER
Answered 2018-Jan-10 at 00:34For each time a function recurs, your program takes more memory on the stack, the memory it takes for each function depends upon the function and variables within it. The number of recursions that can be done of a function is entirely dependant upon your system.
There is no general number of recursions that will cause stack overflow.
Removing the variable 'neighbour' will allow for the function to recur further as each recursion takes less memory, but it will still eventually cause stack overflow.
QUESTION
I wrote a python script to get data from my Gmail account which I imported as a pandas dataframe into a Jupyter notebook. The notebook is called "Automation via Gmail API" and the dataframe is simply called "df". Now I want to use this df to update a Google Sheet via the Google Sheets API. To this end I created another notebook - "Automation via Sheets API". But how can I access df in the "Automation via Sheets API" notebook? Apparently, Jupyter provides some functionality to load a notebook into another notebook. I simply copy and pasted the code of the "Notebook Loader" into my Sheets-notebook and only changed "path" and "fullname", but it doesn't work and I don't have a clue why:
...ANSWER
Answered 2020-Mar-10 at 15:20I would avoid loading your notebook from another notebook unless you are sure that is how you want to approach your problem.
You can always export your dataframe to a csv using pandas.DataFrame.to_csv()
, then load it in your other notebook with pandas.read_csv()
QUESTION
I'm very new to coding and to StackOverflow. I'm trying to create a sapui5 Value Help Dialog ( class sap.ui.comp.valuehelpdialog.ValueHelpDialog) that is supposed to end up filtering search requests from a user table in the SAP backend service.
Right now, I can't even get it to display my mockdata properly. The mockdata consists of a "Personen.json" with an array of users with the following fields like this example snippet:
...ANSWER
Answered 2019-Oct-04 at 12:34Add Column to the table then you are able to see the row with actual value in the table.
QUESTION
I am doing a homework assignment where it wants me to print out the last names from a list of names. It also says I only need 2-3 extra lines of code max. How would I do this?
This is a lesson on lists and I have always had trouble with indexing lists but this takes my mind beyond what I can think.
Here is my code with the list they provided:
...ANSWER
Answered 2019-Oct-03 at 13:00Your code is completely fine you just need to take the second variable after you split the name -
QUESTION
I want to expand only the corresponding block by clicking on the heading. At the moment they all work at once when I click on a heading.
How do I proceed in svelte?
I tried to use the header in the data as ID. But that didn't work.
REPL: https://svelte.dev/repl/8495aab06879495ab379949778dd29f4?version=3.9.1
...ANSWER
Answered 2019-Aug-30 at 21:38As mentioned in the comments, you cannot use a single variable as a flag for multiple elements. It is only natural for all elements to open if you do use a single flag. Instead, you can make use of an array.
QUESTION
I'm using jQuery datepicker in a web app and i allow end users to pick their language. For datepicker i'm loading the locale files(translation files) and everything works fine.
My question is :
How can i read & use the month names, day names etc from a jQuery datapicker language file. For example the datepicker-de.js file look like this:
...ANSWER
Answered 2019-Aug-22 at 09:36$(function() {
$("#datepicker").datepicker();
});
alert($.datepicker.formatDate("MM", "datepicker"));
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