+Slow network makes a pane listing to take forever

Post by *ghisler(Author) » 2013-11-25, 16:31 UTC

The problem is that I cannot reproduce the problem here. I'm trying to find out the conditions when this happens, but so far I don't have any clues.

Post by *ghisler(Author) » 2013-11-27, 15:30 UTC

Could you try to find out with "process explorer" (NOT "process monitor"!) from www.sysinternals.com where TC is hanging? "process explorer" can show the stack trace for each thread, and should also show when a thread is hanging. This would be very useful! Please also post with which beta version you are testing it.

MVV · Post by *MVV » 2013-11-28, 16:38 UTC

I reproduced it with almost clean INI (only copied Configuration section from mine), here test wincmd.ini and threads' stacks from ProcExp:

Code: Select all

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Post by *ghisler(Author) » 2013-11-29, 16:33 UTC

Thanks a lot, I will analyze it! Which beta version did you use?

MVV · Post by *MVV » 2013-11-29, 16:40 UTC

Information is in archive. Latest b11.

Post by *ghisler(Author) » 2013-12-04, 09:23 UTC

After a lot of analyzing, I finally found out that this is actually for beta 10, not beta 11!

Windows hangs in function IShellFolder.ParseDisplayName, which is called to get the OLE comments. Try turning off "Comments from Explorer (OLE2)" in menu Configuration - Options - Display, then check again whether it hangs. If yes, please post a new report.

Unfortunately moving the comment function to a background thread will be very difficult, because some calls like to the content plugins will probably not work well. I will have to do parts in the background and others in the foreground. I also don't know yet how to handle failures of loading the comment when the user moves on to the next file...

MVV · Post by *MVV » 2013-12-04, 11:46 UTC

Sorry, you're right, according to hash from archive it is really beta 10, I've missed attributes somehow (file size for TOTALCMD.exe is quite strange too)...

I'll try to reproduce it with disabled OLE comments in a day or two. But I don't want to disable OLE comments at all because they're useful for me.

I think you can add some wrapper function for such unstable method (or maybe even wrapper interface in case of many unstable methods) that will create separate caller thread and wait for timeout (and terminate thread if it hangs)... something like that:

Code: Select all

struct dataIShellFolder { enum methodId; IShellFolder object; *result; bDone; criticalsection cs; }

DWORD backgroundIShellFolder(dataIShellFolder df) {
	switch (methodId) {
		case idParseDisplayName: df.object.ParseDisplayName(...); break;
	}
	enter(df.cs);
	fill df.result;
	df.bDone=true;
	leave(df.cs);
}

wrapperParseDisplayName(object, timeout) {
	type* result;
	dataIShellFolder df(object, idParseDisplayName, &result);
	h=CreateThread(backgroundParseDisplayName, df);
	while (timeout>0) {
		t=min(500, timeout);
		if (WaitForSingleObject(h, t) != WAIT_TIMEOUT) break;
		timeout-=t;
		// maybe some other actions like message processing to prevent main window freeze
	}
	enter(df.cs);
	if (!df.bDone) TerminateThread(h);
	leave(df.cs);
	CloseHandle(h);
	return df.bDone ? result : null;
}

I think it may increase TC stability for many operations with e.g. slow devices and network places.

Post by *ghisler(Author) » 2013-12-04, 22:43 UTC

Well, I already have such a function (the one which shows the "connecting" dialog after a few seconds). I'm calling this now here. But I have added some extra code to call FindFirstFile (in background) on the file before trying to load any comments. If there is a timeout, I don't retrieve any comments at all until the next successful directory refresh or directory change.

Please try it, and report any other hangs here! I have just decided to postpone the final release to 2014 to get this right.

MVV · Post by *MVV » 2013-12-05, 10:53 UTC

I tried to disable OLE comments in 8.50b10, and I'm still able to reproduce freeze. But TC 8.50b12 is really works much better in contrast to TC 8.50b10 in following case:
1. Use INI from archive above.
2. Enter network share of virtual machine.
3. Disable network adapter in virtual machine.
4. Some times switch between TC and other apps, change panel using mouse or keyboard until freeze, and then click some more times until brighter ghost window appear.
5. TC 8.50b12 becomes responsible in 1-2 seconds while TC 8.50b10 is not responsible for a minute or more. After freeze no one of them shows 'drive not found' message.

However if I use another step 4, TC 8.50b12 still freezes for a minute:
4b. Open configuration dialog and immediately click OK, then click both main window and configuration dialog some more times until they are both turned to white. Dialog 'drive not found' is shown after freeze (in minute or more).

Call stacks during freeze here:

Code: Select all

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Post by *ghisler(Author) » 2013-12-05, 15:51 UTC

Thanks again for the stacks, I will analyze them.

Post by *ghisler(Author) » 2013-12-08, 11:40 UTC

I have analyzed your stack traces now: The hang you report is in the interruptable function which normally shows a "connecting" dialog. However, it is called from the "Apply" function of the settings dialog. Since that dialog is in the foreground and not TC, the abort dialog will not be shown. Instead, the function will be aborted after 5 seconds.

How long did you wait until you got the stack? Can you send me one which is later than 5 seconds after clicking on "Apply"?

Here are parts of the analyzed stack:

Code: Select all

This is the hanging thread trying to load the directory:
$1d3c8: longdos.pas: 3347 LongFindFirst2W
      handle:=MyFindFirstFileExW(psrc,0{FindExInfoStandard},finddataW,0,
            nil,2*booltoint(not is_linux){FIND_FIRST_EX_LARGE_FETCH})

$1d742: longdos.pas: 3445 LongFindFirstW
$200fb7: readdir.pas: 1646 tThreadFindFirst.Execute
$17b46: minithrd.pas: 63 ThreadProc
$362e: psapi.pas: 61 ThreadWrapper

This is the main thread waiting for the read dir thread:
$2012bc: readdir.pas: 1736 ThreadedFindFirstW
     waitres:=WaitForSingleObject(ThreadFindFirst.FoundSemaphore,waittime);

$2029f7: readdir.pas: 2373 GetDirListW
$206fb8: readdir.pas: 3897 RefreshSideW
$243e6a: mainwin.pas: 2437 TTOTAL_CMD.updatelistboxes
$24418e: mainwin.pas: 2510 TTOTAL_CMD.OnUpdate
$26c2f: controls.pas: 2347 TControl.WndProc
$28b8c: controls.pas: 3520 TWinControl.MainWndProc
$2e366: forms.pas: 1052 StdWndProc
$28141: controls.pas: 3172 TWinControlTrap.Win32Proc
$2e366: forms.pas: 1052 StdWndProc
$1a7ae8: confall.pas: 3785 TDLGCONFIGALL.ApplyResults
$1a7b23: confall.pas: 3792 TDLGCONFIGALL.OKClick

MVV · Post by *MVV » 2013-12-08, 13:26 UTC

Actually I'm pretty sure that more than 10 seconds elapsed until I suspended application and copied stacks.

In order to test configuration dialog again I started a virtual machine with Win7 (VirtualBox, host-only network adapter, Win7 Ultimate x32). I made a shared folder and opened it in TC 8.50b12. Then I disabled network adapter from guest OS control panel and switched to TC, and it become frozen immediately! After 20-30 seconds I suspended process and copied stacks (01.txt). After a while TC displayed 'drive not found' dialog. And I can really reproduce such behaviour again! Host OS is Win7Ent64SP1.

I don't know what is different on that PC but TC hangs immediately and I can't move cursor or open dialogs after disabling network adapter. I don't even need to do multiple clicks in order to get ghost window because it hangs w/o it. I placed two windows (TC, VM) side by side and after disabling adapter I only clicked Configuration menu item and TC become frozen. I waited for TC reaction for 20-30 seconds and I noticed that it redraws some directory items (some of them disappeared and appeared again). Then I copied stacks again (02.txt). Next time I tested it, I tried to press Esc multiple times after activating TC, but with no luck. And all this with completely empty INI.

Code: Select all

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Post by *ghisler(Author) » 2013-12-09, 11:08 UTC

You are right, TC has a timeout of 15 seconds when it cannot show the abort dialog.

Your two traces are interesting - one is again the abortable one I explained above. Solution: Do not use the settings dialog while on a network drive.

The second one is when loading icons. To handle this, I will abort loading icons when the first times out. Try using the option EXE/LNK not on net in Configuration - Options - Icons in the meantime to find out whether it helps or not.

MVV · Post by *MVV » 2013-12-09, 13:02 UTC

OK, I'll try to check if it is the icons problem.
But it is really uncomfortable when I need to analyze where I can open configuration dialog. Why does TC reread panels in configuration dialog and after closing it?

MVV · Post by *MVV » 2013-12-10, 15:52 UTC

I tried to count how many seconds TC will be frozen, after 90 seconds I've tired to wait. If I open configuration dialog and then disable adapters, TC hangs too, even when I simply move dialog w/o clicking OK.

After that I enabled option 'EXE/LNK not on net', and you're right, it solved the problem, 'drive not found' dialog appeared within 2-3 seconds! And it doesn't hang when I move configuration dialog with disabled adapter. So it is really essential to prevent prolonged icon loadings.

However if I'm too impatient and do many clicks within these 2-3 seconds, TC window turns to white (ghost window) and this short hang may last more than minute. Here stack 03.txt, maybe you find something interesting.

And, if I open configuration dialog and then disable adapter and click OK, TC hangs for a minute or more before displaying 'drive not found' dialog above configuration one. I got stacks after ~30 seconds, 04.txt.

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