TLDR: C program, hundreds of threads, Eclipse (Oxygen 3) CDT debug view with lengthy tree. How to search?
I'm debugging some software I've written (in C, FWIW) that can generate several hundred threads. About 300 of these are started at launch, and about as many others are started dynamically to perform tasks at runtime. During certain operations I can have well over 500 threads running.
In earlier versions of the software it was possible to exercise a problem to debug it in such a way that only a handful of threads were running when the failure (eg. segfault etc) occurred, so it was reasonable to just look through the thread list in the Debug view and have an understanding of what's going on. More recently I've made many more threads launch at the beginning and while that's had a huge benefit on performance, it means that at any time I'll have a list of threads that's just too long to manually look through.
How can I find a thread based on something I know about the thread, i.e. what function it was started with (passed to pthread_create())? Specifically, how can I search through the tree displayed in the Debug window? Alternatively, I've found a way to copy the contents of this view to the clipboard, but (inexplicably) this only copies what's visible, not the actual tree contents -- how can I auto-expand the entire tree so I can copy it and search in a text editor? Clicking the little arrows to expand each of hundreds of threads to their respective call stacks is just not reasonable.
I'm developing on a RHEL 6 platform (long story, migration to modernity is pending), and for the moment I've found roadblocks in upgrading beyond Eclipse Oxygen 3a (4.7.3a), so that's what I'm stuck with for now.
EDIT: I should clarify -- it's true that I can just press Ctrl-F in the Debug window, and I get a search dialog. However, and I'm seriously dropping my jaw in disbelief here, it also only searches what's visible, not the actual contents of the tree. So for this to be useful, I'd still have to expand every thread in the list manually; there still appears to be no command to do this.
It appears that there is simply no way of searching the list of threads within the Debug view in Eclipse, in a way that is actually useful. Again, the "Find" and "Copy Stack" functions (accessible via right-click) only operate on the text that's visible in the GUI view, not the real contents of the tree.
So, as far as I can tell the only way to get the information I want is to query gdb directly, through the Debugger Console view:
thread apply all bt
OF COURSE, the contents of the Debugger Console view are not directly searchable (unlike the regular Console and most other views in Eclipse), so the text listing must then be copied and pasted into some other editor and searched, to find the thread I'm looking for. Then, with that information I can scroll to it in the Debug list, expand that thread's trace, and continue debugging.
Related
I have a very weird situation. Since a few days, the following actions will crash my Windows 10 PC (using Notes R9.01FP8):
I open my Prefs page in the Domino Designer
click on the Source tab
move to a specific location in a table
then I add a Repeat control
I then open the Properties of the Repeat control
to set the data to JavaScript...
and nothing happens, until after a few seconds: BSOD - Unexpected Kernel Mode Trap in either win32kfull.sys or ntoskrnl.exe.
Sometimes, the JavaScipt box is displayed, so I can paste my code, but a short while later the PC still crashes.
I have to say that my PC crashed a lot lately, so I reinstalled Windows and all drivers, so there might be a rotten one that causes all this. According to DriverEasy, all drivers are now up to date. The Event viewer displays a BugCheck event, but nothing relevant (to me anyway).
What I did for further analysis:
I removed Cache.ndk, it didn't help (of course)
in a copy of the XPage, the system crashes when I add the Repeat
ditto, in a different XPage
it seems to work in a different Notes database, on a different XPage
so I created a new database, copied all elements from the original database over, and still the system crashes when I add the Repeat
I'll be doing so more tests, e.g. with an empty database and just one XPage, then adding my Prefs page, or with the same database but then on a server. Actually, one could say I'm kind of lost, and stumbling around in the dark.
My questions to the XPages/Eclipse gurus:
could it be the workspace, and is there any way to reset it?
do you have any suggestions how to get this solved?
Thanks!
The Windows Creator update that MS posted does not seem to fix the Designer crash.
https://grahamacres.wordpress.com/2017/07/10/domino-designer-still-crashes-after-windows-10-creators-update/
When debugging a J2EE application, in Eclipse, I do see hundreds of Threads.
However, I am interested in a single thread, in which my breakpoint hit.
Going up and forth to find it everytime is a pain.
How do I filter out the unsuspended threads?
As far as I know there is not an easy way to do this. One workaround would be like this:
Get a focus on the Debug view
Ctrl + F (in order to get the find dialog)
Enter something like *Suspended
Click OK
I have a GEF editor which represent a finite state machine. Editor's input (and output) is XML. What I am looking for is a way to debug my editor visually.
The way editor works is you create a state Start->Email->End, XML that is created is send to the server and there magic happens, of course Email object has properties that you set: from email, to email, subject, etc. What I am looking for is a way I can launch a debugger and step through each step of execution. So for example if I break at Email step I would be able to see what message was, whom it was for and what server returned at the end.
Is this something that is possible to accomplish and if so are there any articles I need to read to familiarize myself with how to create this debugger?
I found some discussion about Eclipse debuggers (1,2) but nothing about what I am interested in doing.
There are two different issues here.
One is writing a debugger engine, that manages the execution of your model, for example steps the execution, allows querying the variables/states, etc., and another one that outputs the result in your editor.
The articles you have linked work with the first issue: creating an engine that executes the model in the background, and integrates the engine into the Eclipse environment using 1) the launch framework to execute it similarly as Java programs, and 2) allows displaying the state in the textual editors.
You want to display the state in graphical editors. Because graphical editors have much less in common, the back-annotation of the debug state has to be done manually (instead of the generic support for text editors). Basically, I would create actions that set up breakpoints, and update the model to be able to store/query the execution state, and then update the GEF views to display it on the GUI. For this you have to change your Figures and your EditParts at least, and possibly other places as well.
I'm using PyDev in Eclipse as my Python editor. It's fine in terms of feature set. Everything works fine except for one very annoying thing:
Code completion itself works fast. When I press Alt+Space, the window pops out almost instantly and all the options are there. The option at the top is selected. Then comes the trouble. The detailed description won't appear until about 5-10 seconds. All this time CPU is working at maximum load and the interface is not responding. All the processor is consumed by the Eclipse Java process (the spawned Python process seems idle). Then a yellow window pops up, and all it contains is just a Python code of a selected function/variable. All consecutive details are displayed instantly. The procedure repeats when I close the completion window (for example by accepting one of the options and asking for completion again). This drives me crazy.
I've tried so far:
creating a whole new workspace,
creating an Eclipse/PyDev project from scratch,
tweaking JVM to make sure it has loads of memory,
making sure the right JVM is chosen (the latest Oracle JVM available),
making sure Python process communicates freely with the Java instance (I read about possible problems with that, but it seems not to be the issue).
making sure all the installed plugins are up to date.
The version I use is Eclipse Helios, because the last time I checked certain extensions weren't yet ported to the latest one.
Has anyone observed a similar issue? Was anyone able to get around it? General ideas on how to debug it and file a sensible bug report possibly? Other things worth checking for.
Any workaround less drastic than turning completion off completly?
Thanks!
EDIT:
I've also noticed a problem with a similar popup window in HTML/CSS editor. It looked somewhat similar (a yellow window, with some text inside) and it also took ages to display. Don't really know if that is related, but could be.
EDIT(2):
Ok, No I've started with a fresh install of the newest Eclipse Indigo, without any additional plugins apart from PyDev and the issue remains. Seems like I'll have to look for a new IDE.
What version of Java are you using?
If you are on Windows 7, later versions of Java (I think 6+) will default to IPv6.
This is probably causing the problem as Python maybe wanting IPv4.
Anyway, since I had this problem I tried disabling
PyLint
Code Analysis
but it was still hanging.
Pal's answer about "ipv4 utilization" triggered my memory about another problem I had solved by "preferring" IPv4.
See http://docs.oracle.com/javase/1.4.2/docs/guide/net/ipv6_guide/
What you want to do is to edit your eclipse.ini and add "-Djava.net.preferIPv4Stack=true" in the vmargs section
-startup
plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar
...
-vmargs
-...
-Djava.net.preferIPv4Stack=true
...
I no longer get hangs.
Is there any chance you can provide the code that's making that happen (and add it to a bug report see: http://pydev.org/about.html for links)?
I use PyDev daily with some very large projects and don't have that problem, so, it may be some specific construct or scenario in your code -- or maybe you just haven't given Eclipse enough memory (which would make the garbage collector work much more), in which case, take a look at: What are the best JVM settings for Eclipse? (in specific, raise your -Xmx flag, although you can probably use the other tips there too).
If you can't provide a reproducible scenario, the other choice would be getting a profiler (i.e.: YourKit java profiler has a 15 days free which would help in this case), running that use-case in the profiler and passing a snapshot of what's happening in this situation (if that's the case, please open a bug report at pydev.org and I can help you there).
I got this from pydev.org FAQs and it works fine for me.
When I do a code-completion, PyDev hangs, what can I do?
PyDev does most of its things in the java side, but some information can only be gotten from the python side (mainly builtins), so, in order to get that info, PyDev creates a shell and communicates with it through sockets.
The main problems when that happens are:
There's a firewall blocking the communication to the shell
In Linux, some kernels do not allow ipv4 utilization, which may make PyDev fail.
To enable it, do: echo 0 > /proc/sys/net/ipv6/bindv6only
The timeout to connect is too smal.
It depends upon the "Timeout to connect to shell" in the code-completion preferences (window > preferences > PyDev > Code completion)
If nothing works, please report a bug (also, check if there is anything on the error log (window > show view > PDE Runtime > Error log) and on the eclipse '.log', which is located at the .metadata folder of the workspace location.
Is it possible to make the code-completion on Netbeans automatic, like on Aptana or Visual Studio?
I've noticed that Netbeans can sometimes take a while to populate the list, so this might be asking a bit too much, but if possible, I'd like to somehow enable it.
The onlything I've found in the options is the ability to set a custom key-combo, but not to make this automatic.
I know that if you wait a bit, the auto-completion shows up anyway, but I want it to be without delay.
It appears there is a setting in some NetBeans versions that sets the delay for the popup window.
Choose Tools | Options
Choose Advanced Options
Open the Editing and then Editor Settings folders
Select Java Editor and find the Delay of Completion Window Auto Popup property
Enter a new Delay value in milliseconds (default is 250).
Article where I found it: http://www.informit.com/articles/article.aspx?p=519945&seqNum=5
The problem is that this article is a couple years old, so I opened NetBeans (6.1) on my computer and looked for the property but it didn't exist for the Java Editor (It did for other editors like the XML Editor). This leads me to believe my version is newer than the one in the article and the delay property no longer exists for the Java Editor (checking couldn't hurt though).
So instead, I decided to test the delay. I made a sample project, imported and instantiated a list, and then went to call a method. I stopped at the dot to let NetBeans offer suggestions and it was basically immediate (no noticeable delay). It is at this point, I am wondering if the delay you are experiencing is due purely to performance of the computer, especially since you indicate this occurs "sometimes". It is possible that you are looking at rather large classes, and NetBeans is taking extra time to look up the completions. You could try and test to see if this is true or not by testing code completion on a known large class. The other possibility is your computer is not as fast, or is doing work for another program at the same time. You can try and test this by restarting the computer, opening only NetBeans (to maximize resources to NetBeans), and try some code completions. If either exhibit noticeably faster delays, this is most likely the problem.
Hope this helps.
I think I found a solution. I set up autocomplete keyboard shortcuts for all letters and #, it seems to work. In some cases there is a small lag, but it doesn't prevent you from typing. It took about 5 minutes to add those shortcuts.
I tried to get the desired feature by adding the alphabet to the completion selectors. It worked somewhat, you can always try it.
This works for the first two characters you type This is updated one
Goto:
Tools -> Options -> Editor -> Code Completion
Select
Language: [C/C++]
Autopop Triggers for C/C++ Identifiers
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Good Luck!