hotspots | a graphical view into your rails app 's performance | Performance Testing library
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a graphical view into your rails app's performance
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QUESTION
Suppose I have the following call structure:
funcA() -> funcB() -> funcC()
funcB() -> funcC(), funcD()
In the VTune results (uarch-exploration with hotspots results), the CPU times of individual functions are shown. My question is whether the cpu times are "additive" in nature? That is, the time of A in results also includes the execution time of B and C in the first line, and also whether the time of B in results also includes the execution time of C and D in the second line?
If not, then please confirm whether the hotspots analysis reports the execution time of B = execution time of the first line B + execution time of the second line B?
...ANSWER
Answered 2021-Jun-02 at 20:54Intel VTune, Intel Advisor and some other profilers (eg Crhome profiler) report BOTH inclusive (including B, C, D) and exclusive (A, except B, C,D, thus additive) time metrics. Inclusive is called "Total-Time" and exclusive is called "Self-Time". Read more at: https://software.intel.com/content/www/us/en/develop/documentation/vtune-help/top/reference/cpu-metrics-reference/self-time-and-total-time.html
QUESTION
I'm looking at profiling the score calculation in my Optaplanner project to find out if there are any hotspots that would benefit from being optimised. However, visualvm shows most of the time to be taken in the self time of org.drools.modelcompiler.constraints.ConstraintEvaluator$InnerEvaluator$_2.evaluate. I therefore assume that this method is what actually runs a lot of the constraint's code. What is the best way to find out what specific pieces of code are taking the most time?
ANSWER
Answered 2021-Jun-01 at 13:54The thing to understand about Constraint Streams is that it is not imperative programming, and therefore traditional performance optimization techniques such as code profiling are not going to be very helpful. Instead, I suggest you think of Constraint Streams as SQL - the way to have fast SQL is to think about how your data flows, how you join and what gets indexed.
Recently I wrote a blog post explaining the tricks behind making CS run fast. However, CS is internally interpreted by the Drools engine, and therefore studying it may give you some insights too. Not all insights there are applicable to CS, but if you take a look at drools-metric, you should be able to see which constraints are comparatively slow. And then it becomes a game of tweaking.
QUESTION
this is the code from my route:
...ANSWER
Answered 2021-May-12 at 21:53What happens here is that the code that sends back the response is executed before the axios responses arrive:
- First, a call to a database (is that correct?) using a async/await approach.
- Then you define a function that returns a Promise and call it processing the response in the
then()function. - That piece of code is executed when the Promise is
resolve()d (watch out there's no code to handle a rejected response). - Now the promise is resolved once the
forloop ends, it doesn't wait for theaxiospromises to return, it just triggers the requests and continue. The code block after they return will be run in another moment.
If you want to solve this, one thing you could do is to use async/await everywhere, and make the calls sequentially, something like this:
QUESTION
SparkNotes:
I'm pulling in a crime API to see hotspots. Certain crimes will not be logged with a lat/long, therefore, are not shown up in standard (free) crime apps.
- Lat/Long pins I've overridden to a new lat/long don't show up on first load/or at all. (google-maps-react) (Confirmed lat/long is valid per crimes in near areas.)
- Normal pins that had an existing lat/long show up fine/show up as soon as it loads. (Even though it's all the same array of data.)
- I loop through the blank lat/long and replace the lat/long with a rough lat/long of the area just so it shows up. In my console log I can confirm that I've overriden the blank lat/long.
- I want these records to understand the neighborhoods/potentially avoid moving into a hotspot of specific crimes.
API Normal:
https://data.seattle.gov/resource/tazs-3rd5.json?$limit=20000&$offset=20000&$order=offense_id
Full Use Case (Which doesn't work for at all pins): https://data.seattle.gov/resource/tazs-3rd5.json?crime_against_category=PERSON&mcpp=MAGNOLIA&offense_parent_group=SEX%20OFFENSES
Request for help: Can someone please help on how to get these overridden pins to show up consistently?
Things I've Tried: Force update/having multiple refreshes etc/decreasing async time. Those work for when I put in specific crime report number, but if I search for kidnapping/peeping tom, they will not pull with the rest of the person crimes.
I can confirm that if I just load every crime in that API, the map logs all of them (except the ones I need), It's like a pin per foot of street, but the pins in the categories I need don't show up. (So I don't believe it's a volume issue.)
Code for API Data:
...ANSWER
Answered 2021-Apr-27 at 03:04It seems that there's a timing issue when importing your places data from crimedata.js in the first load of the code. I can see that the places value is empty [] in the initial run then the loading of your places in your crimedata.js will follow after some time. You can see this in the console log in my working code.
To handle this, I used state variables to hold the value of the updatedPlaces data then in componentDidMount function, I used setTimeOut and set value of updatedPlaces state variable from the imported places data that is now available.
I then used this state variable as a condition for the markers to load.
Here's the code snippet:
QUESTION
I am new to HTML, CSS and Bootstrap. I got the problem with overlapping divs when resize the screen to be smaller. The problem appeared when I used the container-fluid as a section and I used a customized div to have the header of the section. I tried to change the display property of my customized div (the header of the section) but it did not work. I have no idea where the problem. I hope you guys could hint me an idea to fix this one. Thank you all in advance and sorry if the question is a bit silly.
This is my HTML:
...ANSWER
Answered 2021-Apr-19 at 03:54Your solution is to remove almost every time in CSS that you manually set the height property. I would advise to never do this if you can avoid it, especially for divs that just contain text.
I wish I could give a more academic answer, but I don't have the experience to do so.
You can read more here about setting the height property if you still desire to do so
QUESTION
I can't find a way to create a group of three small (19px high) labelled radio buttons in material-ui. I'm migrating a browser app from static HTML/JS into material-ui/react, and I need the group to stay the same size.
The button group I'm starting with has three small vertically aligned labelled radio buttons. Here's a screenshot:
Here's the code for the best I've been able to do using the material-ui documentation:
...ANSWER
Answered 2021-Apr-01 at 03:40If you inspect the Material radio button, we can see that the padding of the radio button is causing each row to have a height of 38px.
CodeTherefore, we can simply remove the vertical padding from all radio buttons with the following code (note that my code is slightly different than yours):
QUESTION
I've got a canvas that has an array of objects, these objects are positioned and added to the canvas. Each object has a matching DOM element that triggers a tooltip. This element is placed exactly on top of the canvas object.
On desktop this works fine since the background image is always filling the screen and there is no scrollbar. But on mobile I have a horizontal scrollbar so users can scroll left and right on the image (else it will become to small).
The problem is, the DOM elements that are positioned on top of the fabric objects stay in their spot according to where the objects are without any scrolling, when I scroll horizontally, the DOM elements keep in their same spot.
I made a video on my phone that shows this: https://streamable.com/xn1t2i Dots with circle are the DOM elements outside the canvas that are placed on the canvas objects (blue dots without circles).
So I thought of the following solution: put the entire script inside a function, and call that function on an event, like: touchmove this however is very slow and shows a lot of flickering when moving around. So I tried touchend but this also is pretty slow and also triggers the function when clicking the tooltip.
Example video of touchmove: https://streamable.com/708d2s As you can see the dots do get repositioned, but way too slow and if the scroll drags on a bit too long, the dots get mis-aligned again.
I've also tried scroll but this didn't work at all.
This is my code at the moment:
javascript:
...ANSWER
Answered 2021-Mar-24 at 11:59wrap a new relative positioned div around your .canvas-container and your #cirkel1 ... #cirkelN divs so that the relevant html code area is structured like this:
QUESTION
I am trying to create a canvas that is wider than my mobile screen, users can drag right and left to see the rest of the canvas. But for some reason dragging does not work from inside the canvas.
If I below it (outside the canvas) the page can be dragged left and right, but not inside the canvas. How can I fix that?
Ideally I just want a scrollbar inside the canvas so people can drag left and right on mobile, whilst it doesn't increase the entire page width.
I tried setting overflow:scroll on the canvas but I still couldn't drag it. I also added pointer-events: none;, this allows dragging while focused in the canvas but drags the whole page, not just inside the canvas.
What can I do?
Snippet:
...ANSWER
Answered 2021-Mar-16 at 14:56I fixed it with the following code:
QUESTION
I'm trying to get my app to refresh a select components list of options. The list will show a selection of wifi hotspots and I want the app to scan for them every 5 seconds, so I followed this guide: https://blog.stvmlbrn.com/2019/02/20/automatically-refreshing-data-in-react.html
But when I run the app, I get this error:
Error
...ANSWER
Answered 2021-Mar-03 at 18:19The issue is in the way you are calling .bind():
QUESTION
I have some circles that can be added to a fabricjs canvas. Each circle is an object, while outside my javascript code I have a DOM element, that looks like this:
...ANSWER
Answered 2021-Feb-25 at 19:32It looks like the first time the click event isn't fired right after the mousedown one the first time. The framework you use seems to prevent this because a process (by the listener) is performed.
(It may be related to event propagation but at this time I still didn't find out how to prevent a click event to be fired after a mouseup.)
What I would call a workaround: to display the tool tip in the same click, i.e. a mousedown event followed by a mouseup one, you can set mouseup value for the trigger property, which displays the tool tip:
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