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Thread: Simple phonegap-android app becoming not-responsive

  1. #1
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    Nocholas Gan
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    Default Simple phonegap-android app becoming not-responsive

    Hi,

    I am New and had configured this simple test app
    to randomly generate upto 999 records and to be
    displayed in a List-Control

    Inside a UX where the UX is in one of the PANEL (1)

    I also put together a timer, where these data being re-generated at time interval
    from 3 seconds to one minutes.

    HERE IS MY ISSUES :

    After prolonged running on timer event.
    typical one hour or more ???

    I begin to noticing the Android-Tablet touch becoming very NON-RESPONSIVE.

    This is especially by touching the PANEL-TAB at the bottom of the screen.
    However, having a physical button that direct it to go to say PANEL-6 and
    returning to HOME-PANEL (1) in most case do-able.

    What is it that get-accumulated or loaded to a point that this behaviour
    started to effect the performance of the APP on android.

    Is there somethingi should be done like clear buffers ? "SOMETHING" before re-running
    the creation of the random-data.

    I appreciate your assiatnce .

    Enclosed :

    working-APK
    The actual UX
    TASKMGR-debug.3359410.88.ziptimer_test.a5wcmp

    thanking in advance.

    Nicholas

  2. #2
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    Default Re: Simple phonegap-android app becoming not-responsive

    Has anyone tried the APK on android tablet .
    after more modifications, i remain having the same experince of a total slowed down
    after running it for 4195 times ...@ 10 seconds each sortie...
    its completely tutle slow...

    however, a reboot of the app... would restore the performance to perfect..

    appreciate ANY-SUGGESTIONS

  3. #3
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    Default Re: Simple phonegap-android app becoming not-responsive

    I've not noticed any issues like this... but I've also not run something 4,195 times... without or without shutting down the app.

    Is this process something that will be common to your app?

    Does iOS suffer the same ill effects?

  4. #4
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    Default Re: Simple phonegap-android app becoming not-responsive

    thanks for reply
    never tried IOS ... android is the first one ...
    yes this is suppose to be the plan to have the APP.
    making calculation against a local-stored data ...
    whihc i want/wish to have it synch to the MS-SQL at a server ...

    so i plan to produce the data and feed a simple LIST-CONTROL
    to display the data , at a minimum interval every 5 minutes.

    like 12 times per hour ...

    it was during this over night test on three seperate APK
    i experienced a total slowed-down ...

    while there is no real APP being produced ...
    and since i see this delay issues on all three APK.

    i therefore decide to produce one simple one to the community
    to see if anyone out there can detect the similar problem.

    I have ran it on an LG tablet ...

    my real curiocity .. if there is such tools or way to determine
    what had taken-down the performance ...

    I have not actually tested running LIVE-PREVIEW
    perhaps someone can help me detect the issues via debug ?

    sorry its beyond me ...

    Yes , I wish to see it run continuosly ....
    would accpet a REBOOT at midnight perhaps.//

    meaning at least 24 hours running ...
    24 X 12 sorties of refresh(es)

    thanks
    Nick

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    Default Re: Simple phonegap-android app becoming not-responsive

    I doubt it matters, but knowing the version and build of Alpha would be helpful. Also knowing the version of Android would be good.

    Also, your goal is 288 refreshs per day. I understand the concept of wanting to ensure the app works beyond its design, but 4,195 is quite a bit more.

    What happens after 288 refreshes? After 100? After 10?
    Last edited by Davidk; 01-02-2019 at 12:51 PM.

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    Default Re: Simple phonegap-android app becoming not-responsive

    If you are running it on a device and it hasn't synchronized the data in small batches, then it's going to slow it down. I would work on the sync process and tweak it to get better performance. Typically, on mobile apps you are adding the records on the client side, and then synchronizing them. As you add more records locally it's using more local (in app) memory on the device...as you add more records it has to sync more...as your list grows it takes more memory to display it. If you are asking it to always refresh all the data on sync, then it will slow down for sure as the list grows. When you restart the device and app it will speed back up because it has cleared all of it's local memory and isn't synchronizing and refreshing as much data.

  7. #7
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    Default Re: Simple phonegap-android app becoming not-responsive

    Thanks Sean & David ...

    There is no-synch to server "ever" based on my sample ... purelt "STAND-ALONE" as it
    no sql, no new records ... just delete the static-list
    and populated with random records ......

    12.45.46 built 5447
    Built 5206 ... add in

    can you give me some hint on clearing the MEMORY each time/before/the random codes being generated ???
    i appreciate that IDEA

  8. #8
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    Default Re: Simple phonegap-android app becoming not-responsive

    DAVID,

    refresh every 5 minutes is desireable ... like getting latest news or weather to show on tablet
    is it out of specs ?

    i am sure, there are users who is using such timer-query-populate method ...
    my sample is purely ... the simplest LIST-CONTROl & no server call
    no-;ocal storage that i am awared off

    unless someone can point me to such unintentional setting that i a, not clear

    thanks

  9. #9
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    Default Re: Simple phonegap-android app becoming not-responsive

    Quote Originally Posted by webdesignshop View Post
    if you are running it on a device and it hasn't synchronized the data in small batches, then it's going to slow it down. I would work on the sync process and tweak it to get better performance. Typically, on mobile apps you are adding the records on the client side, and then synchronizing them. As you add more records locally it's using more local (in app) memory on the device...as you add more records it has to sync more...as your list grows it takes more memory to display it. If you are asking it to always refresh all the data on sync, then it will slow down for sure as the list grows. When you restart the device and app it will speed back up because it has cleared all of it's local memory and isn't synchronizing and refreshing as much data.
    how to clear memory without rebooting ????

  10. #10
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    Default Re: Simple phonegap-android app becoming not-responsive

    I don't think there is a memory problem (see the attached screenshot of the Performance monitor representing a "refresh" every 3 seconds). Just before the 22 seconds mark, a garbage collector runs and seems to reset everything to nicer levels. I think you are getting the classic rendering lag that many SPA's are victim of.

    Will you need to render a 1000 rows for the user to see and scroll through? I noticed that the list virtualization wasn't turned on. That being said, I didn't actually install the apk (can't really trust an unknown apk).
    Seems like you explicitly refresh the list a lot.
    I didn't go through it to see if you stop the timer or the explicit refresh as you navigate to another panel. I believe the simple fact of navigating to another panel will refresh the list... and if you are explicitly calling for some list refreshes at "the same time", well, you are going to get javascript engine to block the rendering engine a lot (the red 0 FPS periods you see in the Performance monitor screenshot).

    Where it is possible, I would add the optional honorChangeEvent argument to false for the {dialog.object}.setValue() method. You seem to have some hide/show expressions that will mess with the DOM on one panel as you are perhaps refreshing the list (more heavy DOM manipulation) while navigating to another panelcard (even more DOM manipulation as, in some cases, Android will be triggering the resize event and the list will be redrawn again)...

    You might want to add a little console.log() to the list's onListDraw event to see the number of times the list gets redrawn. You might be surprised.2019-01-02 11_50_09-Window.png

  11. #11
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    Default Re: Simple phonegap-android app becoming not-responsive

    a very encouraging response from you
    i thank you for that and will try my best to understand your explanation

    in real live usage , i would be happy to perform this every 2 minutes ...
    and there wont be more than 50 records to be munipulated .

    for purpose of this stress-test, i found codes that would rendomly generate
    upto 999 records ...

    yes , i wont be expecting refresh every 3 seconds ...
    trust a 120 seconds would be sufficience to menipulate a local storage (eventually)
    where the local storage would be "refreshed" to server before the munipulation
    to take place ... so would be more than 120 seconds per sortie

    would appreciate more assiatance or suggestion .

    since my simple UX is enclosed , hope someone can suggest
    what/where codes to be added to bring this to a smoother operation @ APK

    thanking in advance

  12. #12
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    Default Re: Simple phonegap-android app becoming not-responsive

    When you render a list, unless it's set for virtualization, all of the list data will be loaded into app memory. App memory is limited on all devices exept for Windows (I believe), although it's larger for Android than IOS. In your case, all of the app data resides in local memory anyway. If you notice that it runs ok on a desktop, but has issues on the mobile device, that could tell you it's a memory management issue. If it runs better after you reboot the device that could tell you it's a memory management issue.

    I don't know if this will help...but try it:

    Make the list persist to Local Storage
    Turn on list virtualization

    Even though you are still using in app memory this way, it will separate the data from the app display and use less "browser" memory. Right now the javascript is holding all the data. With persisting to local storage it's in a json file. Try it and let me know how it goes.

  13. #13
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    Default Re: Simple phonegap-android app becoming not-responsive

    Quote Originally Posted by WebDesignShop View Post
    When you render a list, unless it's set for virtualization, all of the list data will be loaded into app memory. App memory is limited on all devices exept for Windows (I believe), although it's larger for Android than IOS. In your case, all of the app data resides in local memory anyway. If you notice that it runs ok on a desktop, but has issues on the mobile device, that could tell you it's a memory management issue. If it runs better after you reboot the device that could tell you it's a memory management issue.

    I don't know if this will help...but try it:

    Make the list persist to Local Storage
    Turn on list virtualization

    Even though you are still using in app memory this way, it will separate the data from the app display and use less "browser" memory. Right now the javascript is holding all the data. With persisting to local storage it's in a json file. Try it and let me know how it goes.
    all implemented as suggested ... test is being run ...TASKMGR-debug.3359410.89.ziptimer_test.a5wcmp

    enclosed updated ... APK & UX

    thanks everyone

  14. #14
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    Default Re: Simple phonegap-android app becoming not-responsive

    it has ran for 150 sorties ... no slow down so far
    a very encouraging adjustment ... now virtualized to show 10 records on the LIST-CONTROL

  15. #15
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    Default Re: Simple phonegap-android app becoming not-responsive

    I believe that once you populate the list with all that data, whether you have virtualization on or not, the list object in memory contains the data. However, if you don't turn on virtualization, not only do you have all that data in the list object, but you render the list box with possibly many thousands of new DOM nodes. I believe his app (simple for the moment) was already getting up to something like 65000 nodes. Many tablets just will not be able to get rid of and then recreate and re-render many thousands of nodes so quickly. And especially not be fast if it keeps redrawing because of explicit refreshes and additional refreshes that you might not expect. Some Android versions are firing off resizes, and therefore redraws, at the most unexpected moments. For instance, no need to even go to another panelcard to see the bad lag; simply put focus on one of the textboxes in order to fire off the virtual keyboard and you'll see at least 2 redraws of the whole app. in the Performance tab of Chrome DevTools if you launch a recording. I don't believe iOS behaves the same way if the keyboard pops up (ie. the viewport dimensions do not change because the virtual keyboard is more of an overlay rather than the case on Android where the keyboard actually keeps reducing the viewport size).

    One additional test you could try would be to check the "Full Screen" option in the PhoneGap App Build dialog and compare to the version without the option. You may also want to add the Status Bar plugin and hide it while the app is open. I seem to get less resizing firing off in Android when the statusbar is hidden.

  16. #16
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    Default Re: Simple phonegap-android app becoming not-responsive

    thnaks and test is in progress ...

  17. #17
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    Default Re: Simple phonegap-android app becoming not-responsive

    regret to inform that the problem remain the same and everything slowed-down
    really badly

  18. #18
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    Default Re: Simple phonegap-android app becoming not-responsive

    Resend your ux. What are the device specs you are testing it on?

  19. #19
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    Default Re: Simple phonegap-android app becoming not-responsive

    While looking at the memory allocation in Chrome DevTools, I saw a potential problem with the onTimer event.
    So I think it would be better to get rid of the code in the onTimer event that runs the buttonClick() method on a button that no longer exists.

    EDIT: Nevermind, I found the SET_AUTO_TIMER button. Always so hard to use the find feature to find certain types of control IDs
    Last edited by jgrannis; 01-03-2019 at 11:40 AM.

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    Default Re: Simple phonegap-android app becoming not-responsive

    I would try to simply this UX significantly. It seems, and feels, like a jumble of Action Javascript statements, jumping around... a lot... and bound together with A5.executeThisThenThat() statements.

    There is also something odd going on with the A5.executeThisThenThan stuff. I'm not convinced this method is actually working the way it's used or intended. The doc declares that A5.executeThisThenThat() is for executing multiple Ajax Callbacks synchronously. But this app is not performing Ajax Callbacks.

    I would get rid of all the inline Javascript statements and simply run Javascript code on a button. Instead of using A5.executeThisThenThat()... use A5.runChain() instead. A5.runChain() was specifically built to run JavaScript functions synchronously.

    When I look at the elements of the app while it's running, the List html nodes look like they are being deleted, but LocalStorage is holding variable amounts of data... from 100 items to 700+ items... it's really odd. I might guess that stuff isn't running in the order it's intended.

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    Default Re: Simple phonegap-android app becoming not-responsive

    To piggy back on what Jeff and David are saying, I'm wondering if it might be best to NOT always delete everything? Maybe delete only once the stored list has a certain number of records or based on some specified time interval. This use case is interesting and is a good test overall of memory management. Might be best, after streamlining it a bit, to take it to Selwyn and see what he has to say about it.

  22. #22
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    Default Re: Simple phonegap-android app becoming not-responsive

    Quote Originally Posted by WebDesignShop View Post
    Resend your ux. What are the device specs you are testing it on?
    https://forum.alphasoftware.com/atta...9&d=1546459685

  23. #23
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    Default Re: Simple phonegap-android app becoming not-responsive

    I’ve been running it for awhile (after having removed of those hide/show expressions) and see thousands of system objects getting created in memory and never deleted. Not javascript objects but system objects. I am kind of wondering if this isn’t one of those cases where by simply observing it (ie. building it in debug mode) modifies its behavior some. I say that because I was seeing a lot of those system objects had to do with debug information.
    I was also seeing a lot objects getting created from $acn and $rcn and having to do with the hover class. But I haven’t figured out yet if those are contributing to the memory leak. I was wondering if it would be interesting to look into destroying the list object and re-initializing it instead of cycling through removing and then populating the rows.
    Also, although this is obviously just a POC and the real app might not be replacing the list data completely like that every once in a while, is it really interesting to persist the list data to local storage?
    Another solution might be to feed an array and use the array data to merge it with a template. Or maybe use a viewbox instead of a listbox. The listbox might have too much unused overhead functions that you aren’t using if you are just going to present the data to the user.

  24. #24
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    Default Re: Simple phonegap-android app becoming not-responsive

    Quote Originally Posted by Davidk View Post
    I would try to simply this UX significantly. It seems, and feels, like a jumble of Action Javascript statements, jumping around... a lot... and bound together with A5.executeThisThenThat() statements.

    There is also something odd going on with the A5.executeThisThenThan stuff. I'm not convinced this method is actually working the way it's used or intended. The doc declares that A5.executeThisThenThat() is for executing multiple Ajax Callbacks synchronously. But this app is not performing Ajax Callbacks.

    I would get rid of all the inline Javascript statements and simply run Javascript code on a button. Instead of using A5.executeThisThenThat()... use A5.runChain() instead. A5.runChain() was specifically built to run JavaScript functions synchronously.

    When I look at the elements of the app while it's running, the List html nodes look like they are being deleted, but LocalStorage is holding variable amounts of data... from 100 items to 700+ items... it's really odd. I might guess that stuff isn't running in the order it's intended.
    thanks David, will look at the ux carefully and provide update later on the day ...
    it is supposed to be as simple as I can do it ...

    no ajax
    no sql
    just plain static List
    a random generated up to 999 records fed the empty list

    a timer that cal it every xyz seconds ....

    no intention iof involving any server or any external mean...
    will probably do a call to a web site url to get a formula and on timer
    the calculation to take place again and again base on timer ...

    i just need to take care the slowed-down ...

    i had inplenebt REBOOT every 2 hours and is working

    BUT why cant i have this running continously or at least for 24 hours

  25. #25
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    Default Re: Simple phonegap-android app becoming not-responsive

    Quote Originally Posted by jgrannis View Post
    I’ve been running it for awhile (after having removed of those hide/show expressions) and see thousands of system objects getting created in memory and never deleted. Not javascript objects but system objects. I am kind of wondering if this isn’t one of those cases where by simply observing it (ie. building it in debug mode) modifies its behavior some. I say that because I was seeing a lot of those system objects had to do with debug information.
    I was also seeing a lot objects getting created from $acn and $rcn and having to do with the hover class. But I haven’t figured out yet if those are contributing to the memory leak. I was wondering if it would be interesting to look into destroying the list object and re-initializing it instead of cycling through removing and then populating the rows.
    Also, although this is obviously just a POC and the real app might not be replacing the list data completely like that every once in a while, is it really interesting to persist the list data to local storage?
    Another solution might be to feed an array and use the array data to merge it with a template. Or maybe use a viewbox instead of a listbox. The listbox might have too much unused overhead functions that you aren’t using if you are just going to present the data to the user.
    THANKS JEFF,

    for your detail analysis ... there is no-doubt an interesting topic.
    i had constructed more than 6 phonegap samples and all exhibit simialr slowed down.

    again , its beyond me and hope someone could take the SIMPLE-UX and add/delete few codes
    and shre it back here for further sharing ...

    one of these days ... someone out there would need something running like what i am trying to experiment with.
    thanks

  26. #26
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    Default Re: Simple phonegap-android app becoming not-responsive

    Am I correct to understand this as being the flow?

    1) button click SET_AUTO_TIMER
    2) stop the timer
    3) remove all rows (which basically just populates with an empty array)
    4) refresh the list
    5) button click REFRESH
    a) stop the timer again
    b) remove all rows again (which basically just populates with an empty array)
    c) create data and populate list with the data
    d) refresh the list again
    e) set the status that fires off a bunch of hide/show calculations for various elements
    6) call the set_timer function
    a) call the startTime function
    i) set the count down value
    ii) setTimeout for a half a second and keep calling startTime every 500ms (does it ever stop? basically the same as setInterval, right?)
    b) continue in the set_timer function while "fighting" with set-timer running every 500ms (probably runs slightly longer than 500ms because it means after 500ms stick the call to the end of the stack)
    c) start timer
    i) starting the timer triggers the onTimer event that calls buttonClick('SET_AUTO_TIMER') and then immediately stops the timer, etc.., etc...
    But does that end up multiplying the number of different startTime loops that run every 500ms until you have it runnig every millisecond after a few hours?

  27. #27
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    Default Re: Simple phonegap-android app becoming not-responsive

    Yeap, I put a little console.log() inside that startTime function and ran the thing every 3 seconds. Doesn't take long before it does nothing but run startTime()

  28. #28
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    Default Re: Simple phonegap-android app becoming not-responsive

    You'll probably want to take the call to startTime() out of the loop and just call it once.
    If needed, run it with var myVar = setInterval(myTimer, 1000); and then stop if needed with clearInterval(myVar)

    To simplify that other part, maybe only call {dialog.object}.onTimerEventStart(interval) and pass in the interval dynamically.
    No need for onTimerEventStop I think.
    Just put return false in the beforeOnTimer event to stop it (for instance, if a button click set the status to 'stopped').

    I personally would explicitly hide and show that extra info. when I call onTimerEventStart and just before the return false in beforeOnTimer.
    I really don't like those hide/show expressions. I lose track of when they get recalculated. I prefer, in most cases, to know exactly when I need them to show or not.

  29. #29
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    Default Re: Simple phonegap-android app becoming not-responsive

    Quote Originally Posted by jgrannis View Post
    Am I correct to understand this as being the flow?

    1) button click SET_AUTO_TIMER
    2) stop the timer
    3) remove all rows (which basically just populates with an empty array)
    4) refresh the list
    5) button click REFRESH
    a) stop the timer again
    b) remove all rows again (which basically just populates with an empty array)
    c) create data and populate list with the data
    d) refresh the list again
    e) set the status that fires off a bunch of hide/show calculations for various elements
    6) call the set_timer function
    a) call the startTime function
    i) set the count down value
    ii) setTimeout for a half a second and keep calling startTime every 500ms (does it ever stop? basically the same as setInterval, right?)
    b) continue in the set_timer function while "fighting" with set-timer running every 500ms (probably runs slightly longer than 500ms because it means after 500ms stick the call to the end of the stack)
    c) start timer
    i) starting the timer triggers the onTimer event that calls buttonClick('SET_AUTO_TIMER') and then immediately stops the timer, etc.., etc...
    But does that end up multiplying the number of different startTime loops that run every 500ms until you have it runnig every millisecond after a few hours?

    Thanks Jeff, just got into my work-space ....

    a) call the startTime function
    i) set the count down value
    ii) setTimeout for a half a second and keep calling startTime every 500ms (does it ever stop? basically the same as setInterval, right?)

    these 500ms never intended ! , let me see what/where that 500ms got called upon
    will make some adjustment as close as possible to your recommendations

    i will try re-post another UX sample

  30. #30
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    Default Re: Simple phonegap-android app becoming not-responsive

    I CONSIDER THIS IS AN UN-SOLVED ISSUES ....

    while i have not been able to make all those adjustments as outlined or suggested .
    i come to a simple conclusion that despite trying to be as simple and as easy to have app developed
    with alpha and phonegap ... we seem to see many hidden conflicts and errors generated in the background
    which is beyond my ability to detect ...

    i trust given time and more updates and proper reporting and investigations , these issues would be sddressed
    and rectified in the "core" of the alpha developement .

    i hope we will get more interest parties to put this simple-ux to a more serius modification and share back here
    for the benefit of all ... there is no questions .... there will be slow down if you do like what i did ... a typical DIY person
    with limited knowledge of all the pro-con of certain procedures or buttonclick to avoid or not using proper timer etc etc

    for most of "us" , we go by what we can find in genie , there are so many ways to do it in alpha ...

    THANKS everyone

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