Copying files slower the more files are in a directory

[slarti76]

Weird behaviour of the Copy File action:

The more files are in the source directory and the further down alphabetically the file comes, the slower copying is (and also other functions like "Test File"). At least on Android 11 I can reproduce it on several devices.

Easy to reproduce:
Take a directory with 1000 files - nothing unusual when copying pictures from a camera SD card: They always have up to 1000 files in one directory.

Let's say they're P100001.JPG to P100999.JPG. Now measure copy times: The first file will be copied with normal speed, the last one takes 10x longer or more.

For me, in a directory with 800 files, the first file of ca. 10MB was copied in 200-300ms, the last file needed up to 10s!

I'm think it wasn't like this with Android 10, but I updated a while ago and last time I copied pictures with 10, the directory might have not been that full.

I can rule out the SD card itself: I tried several, all with the same effect, and also copying the files with a filemanager (Total Commander, internal) always had the same speed, no matter which file...

[Matevz Leskovsek]

offtopic but I use foldersync app (also free version is ok) and it
integrates with tasker great

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[Ingo Rau]

@matevz Me too, but in this case I'm doing much more sophisticated stuff with the file copy than FolderSync can do... 

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[jmjc...@gmail.com]

I don't have A11 yet. But when tested on my Samsung A10 (a folder with 750 files 20GB), it worked fine with both native Copy Files action and shell commands. So, probably a A11 thing.

[jmjc...@gmail.com]

BTW, can you use shell commands, e.g. cp, to copy files to external SD card on A11?

[Ingo Rau]

Actually, I was using Shell commands before, but since A11 they don't work anymore from it to extremal storage. I mean physically extremal, intSd and extSd work. Got that discussion before, seems like she'll commands can't be executed with the same storage permissions as the main app or so... 

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[jmjc...@gmail.com]

What a bummer. I have tons of sync files tasks using shell commands because they work much better and faster. I guess I am stuck on A10 for a long while.....

[Ingo Rau]

Yeah, I was afraid of that, too, but I've been lobbying Joao to include copyFile() etc. as JS commands in the hope them using the app permissions. But even if they do, it"s no solution of they're also that slow... 

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[João Dias]

Can you please let me know how to test that behaviour with Test File? I'm guessing it's handier to test it with that instead of copying files 😅 Thanks in advance!

Thank you for your contact.

   Join: connect multiple devices (send pushes, remote SMS, notifications) on Android, Windows, Mac, Linux

   Tasker: customize/automate anything on your phone!

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João Dias

[Ingo Rau]

Well, you need to copy something initially, the whole point is a about directories with lots of files. But don't worry, i made a task to create 1000 files on any storage: 

    Create Testfiles (161)

     A1: Tasker Function [ Function:ListStorageVolumes(false) ] 

     A2: JavaScriptlet [ Code:var entries = []

    for (i=0; i<path.length; i++)

    {

       entries[i] = '<b>' + path[i] + '</b> (' + (external[i] == 'true' ? 'ext' : 'int') + ')<br><i>Description:</i> ' + description[i] + '<br><i>Subsystem:</i> ' + ((typeof subsystem !== 'undefined') ? subsystem[i] : 'n/a')

       if (uuid[i] != 'undefined')

          entries[i] += '<br><i>UUID:</i> ' + uuid[i]

       if (can_access[i] != 'true')

          entries[i] += '<br><b><i>Not accessible!</i></b>'

    } Libraries: Auto Exit:On Timeout (Seconds):45 ] 

     A3: List Dialog [ Mode:Select Single Item Title:Where to create test files? Items:%entries Selected Items: Long Click Task: Button 1:Cancel Button 2: Button 3: Close After (Seconds):120 Use HTML:On First Visible Index:0 Hide Filter:On Continue Task After Error:On ] 

     A4: Stop [ With Error:Off Task: ] If [ %ld_selected !Set ]

     A5: Variable Set [ Name:%targetdir To:%path(%ld_selected_index)/TestFiles Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A6: Pick Input Dialog [ Type:File Title:Select file Text:Choose file to copy on next screen. Should be at least 1MB. Default Input: ] 

     A7: Create Directory [ Directory:%targetdir Create All:Off Use Root:Off ] 

     A8: Flash [ Text:Copying %input to %targetdir/Txxxx... Long:On ] 

     A9: For [ Variable:%counter Items:1000:1999 Structure Output (JSON, etc):Off ] 

     A10: Copy File [ From:%input To:%targetdir/T%counter Use Root:Off ] 

     A11: End For 

    

And with this task you can test the action duration: 

    Test Copy (122)

     A1: Tasker Function [ Function:ListStorageVolumes(false) ] 

     A2: JavaScriptlet [ Code:var entries = []

    for (i=0; i<path.length; i++)

    {

       entries[i] = '<b>' + path[i] + '</b> (' + (external[i] == 'true' ? 'ext' : 'int') + ')<br><i>Description:</i> ' + description[i] + '<br><i>Subsystem:</i> ' + ((typeof subsystem !== 'undefined') ? subsystem[i] : 'n/a')

       if (uuid[i] != 'undefined')

          entries[i] += '<br><i>UUID:</i> ' + uuid[i]

       if (can_access[i] != 'true')

          entries[i] += '<br><b><i>Not accessible!</i></b>'

    } Libraries: Auto Exit:On Timeout (Seconds):45 ] 

     A3: List Dialog [ Mode:Select Single Item Title:Select Storage with test files Items:%entries Selected Items: Long Click Task: Button 1:Cancel Button 2: Button 3: Close After (Seconds):120 Use HTML:On First Visible Index:0 Hide Filter:On Continue Task After Error:On ] 

     A4: Stop [ With Error:Off Task: ] If [ %ld_selected !Set ]

     A5: Variable Set [ Name:%sourcedir To:%path(%ld_selected_index)/TestFiles Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A6: Test File [ Type:Exists Data:%sourcedir Store Result In:%exists Use Root:Off ] 

     A7: If [ %exists neq true ]

     A8: Flash [ Text:Path %sourcedir not found! Long:Off ] 

     A9: Stop [ With Error:Off Task: ] 

     A10: End If 

     A11: Variable Set [ Name:%file1 To:%sourcedir/T1000 Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A12: Variable Set [ Name:%file2 To:%sourcedir/T1999 Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A13: Variable Set [ Name:%target To:TestFiles/Target Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A14: Variable Set [ Name:%tsstart To:%TIMEMS Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A15: Copy File [ From:%file1 To:%target Use Root:Off ] 

     A16: Variable Set [ Name:%duration_copy1 To:%TIMEMS - %tsstart Recurse Variables:Off Do Maths:On Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A17: Variable Set [ Name:%tsstart To:%TIMEMS Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A18: Copy File [ From:%file2 To:%target Use Root:Off ] 

     A19: Variable Set [ Name:%duration_copy2 To:%TIMEMS - %tsstart Recurse Variables:Off Do Maths:On Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A20: Variable Set [ Name:%tsstart To:%TIMEMS Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A21: Test File [ Type:Modified Data:%file1 Store Result In:%mtime Use Root:Off ] 

     A22: Variable Set [ Name:%duration_test1 To:%TIMEMS - %tsstart Recurse Variables:Off Do Maths:On Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A23: Variable Set [ Name:%tsstart To:%TIMEMS Recurse Variables:Off Do Maths:Off Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A24: Test File [ Type:Modified Data:%file2 Store Result In:%mtime Use Root:Off ] 

     A25: Variable Set [ Name:%duration_test2 To:%TIMEMS - %tsstart Recurse Variables:Off Do Maths:On Append:Off Max Rounding Digits:3 Structure Output (JSON, etc):On ] 

     A26: Flash [ Text:Copy: %duration_copy1 / %duration_copy2 ms

    Get MTime: %duration_test1 / %duration_test2 ms Long:Off ] 

     

On my phone, neither internal nor external SD show s significant difference. But for a microsd attached as OTG with adapter, copying the last file is factor 20 slower, getting the mtime even 200x!

I can also say that a file manager shows no difference, all files copy fast as they should.

And Tasker's internal openn file dialog also takes >1min to show the contents of that created directory on the OTG storage, but no problem for the others. Android even asks whether it should kill Tasker...

Hope that helps! 

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[João Dias]

Thank you! Would it be possible for you to export that to URIs (not links, simply URIs) and paste them here so I can import them directly? Thanks again!

[Ingo Rau]

Always forget about that option...

taskertask: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

taskertask: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[jmjc...@gmail.com]

Is it because Tasker is copying one file at a time and file manager is somehow copying "a batch" similar to a shell command?

[Ingo Rau]

No, the effect is independent of how many files are copied! It only depends on how many files are in the source directory. 

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[jmjc...@gmail.com]

I see. If you only copy one file, it still takes that long?

[Ingo Rau]

Yes. Only from OTG devices. I posted two tasks above to reproduce. For me it happens on at least two devices with A11 and all cards I tried. Don't have A10 anymore, there I used shell commands, which unfortunately also doesn't work anymore for OTG... 

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[jmjc...@gmail.com]

On A10, I use ADB Wifi instead of Run Shell, and shell commands work.

On A11, if I have a folder with 800 files and two identical files, named 111.mp4 and zzz.mp4. if I copy them to an OTG drive using the Copy Files action, zzz.mp4 will take 10x more time to copy than 111.mp4, correct? Let me test it. I just borrowed a phone that has A11.

[jmjc...@gmail.com]

Just did a test. Created 1000 files like you suggested. All files are the same except for the filename. Copied 0001, 0500, 0980 to my USB drive. All copy durations are similar for the 3 files. 

[Ingo Rau]

And you did copy from an OTG device?

I mean, I wouldn't be surprised if it depends on some other condition. What device do you have? I only have Samsung, so if you don't, perhaps its something on their system. 

Really curious what results Joao gets... 

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[jmjc...@gmail.com]

Thought it was from internal to OTG. Did it again:

Test #1:

Source: OTG folder with 1000 files

Target: Internal folder

Result: 0980 took significantly more time (8x+) than 0001

Test #2:

Source: Internal folder

Target: OTG folder with 1000 files

Result: same as above

It does seem like if an OTG folder with a lot of files is used in a Tasker copy files action, whether it is the source or target, this behaviour happens.

Tested on a Samsung S6, A11, One UI3.1

[Ingo Rau]

Thats exactly my experience. Thx for testing, glad to see it's really a general thing, not just a fluke for me... 

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[jmjc...@gmail.com]

Found same issue on both A10 and A11. Simply copy 1000 files (each 3mb) from internal to OTG:

    OTG Copy 2 (46)

     A1: For [ Variable:%num Items:1:1000 Structure Output (JSON, etc):On ] 

     A2: Copy File [ From:%path1/sample.jpg To:%path2/test/file%num.jpg Use Root:Off ] 

     A3: End For 

 

%,path1 is internal and %path2 is OTG drive. 

  

On both A10 and A11, the above Copy File action loop took a long time to complete because once it got past 300 files, the copy speed started to get worse and when it got to 700 and beyond, the copy speed was unbearable.

Copy File action completion time: 26 min 2 seconds

On A10, since shell commands still works, if we replace the Copy File action with a ADB WIFI "cp %path1/sample.jpg %path2/test/file%num.jpg" command, the copy speed stayed pretty much the same ( a little worse but not by much) from 1 to 1000.

ADB cp completion time: 2 min 19 seconds

So, it doesn't seem like a pure A11 issue.

[João Dias]

Hi again and sorry for the delay! I actually think I fixed it! :) Thank you very much for the test tasks, they were super useful.

Can you please try this version? https://drive.google.com/file/d/1SvQFvAxFwCk-hArfO_6wOH0UlvvMGi0z/view?usp=sharing

If you want you can also check any previous releases here: https://drive.google.com/drive/folders/1GW55YKFiuOZhJVswnt_BQUCJoGm36ugF?usp=sharing

[slarti76]

Hi Joao
No worries about the delay, especially as your fix works perfectly for me. The second copy/get mtime is now even faster than the first (probably something to do with caching). ;)
Great work, thx!

[João Dias]

Awesome! :) Very glad to hear that!

[jmjc...@gmail.com]

The new version fixed the "Copy from OTG to Internal" issue. But the Copy 1000 files from Internal to OTG is still not fixed. On both A10 and A11, the problem remains. :-(

[João Dias]

Does the delay also happen if you simply have many files in the destination directory? Or do you really need to copy hundreds of files to see the issue?

[jmjc...@gmail.com]

Yes, as long as target is OTG and target folder has a lot of files, delay happens.

Tests done on a Samsung S20 A10 and Samsung S6 Tablet A11. Both using Copy Files action.

Test #1:

Copy 20 files, 3MB each, from Internal to OTG

Source folder: one file only

Target folder: 1000 existing files

Time it took: 42 seconds

Test #2:

Copy 20 files, 3MB each, from Internal to OTG

Source folder: one file only

Target folder:  1 existing file

Time it took: 2 seconds

[jmjc...@gmail.com]

Same tests as above but copying just ONE file:

Test #1:

2.041 seconds

Test #2:

0.235 seconds