I was checking our system for performance issue and found out that messagebox() takes relatively longer time. I am not sure what is causing this to take more time. Does anyone have any idea about it?
Is there an alternative to messagebox?
Appeon version - 2017
OS Version - Windows 2016.
Related
We have a set of utility programs which reads an .xlsx file for some input data and generate reports, Apache POI is used for this purpose. Excel file got 8 sheets with an average of 50 rows and 20 columns of data. Everything was working fine in normal Windows 7 box (Read developers machine). The file reading will get finished in few seconds.
Recently we moved these jobs to a Windows Server 2012 R2 box and we have noticed that the last sheet in the excel file takes lots of time to finish reading. I have duplicated the last sheet to confirm that this is not the data issue and executed the job, the second last sheet( was the last one in the previous execution) got finished reading in milli seconds and the last one (duplicated sheet) got again stuck for 15 minutes. My best guess here is that this may be because the time taken to close the file is getting too high but that is just a guess and no concrete evidence to prove that, also if that is the case I am not sure why so. Only difference between working Windows boxes and non-working boxes are the OS, rest all configurations are similar. I have analyzed the heap and thread dump and no issues found.
Is there any known compatibility issues with POI and Windows server boxes? Or is it something related to code? We are using POI-XSSF implementation.
Ok, finally we got the problem; the issue identified is with the the VM itself, the Disk I/O operation is always 100% and file read/write was taking a lot of time to complete, this caused the program to stuck there. However we couldnt identify why the disk I/O is high, tried some blogs but didnt work hence we downgraded the OS to Windows 2008 server and it worked well.
Note that there is nothing to do with POI or anything, it was certainly a VM/OS issue.
I have posted on this before, but thought I had tracked it down to the NW extension, however, memory leakage still occurs in the latest version. I found this thread, which discusses a similar issues, but attributes it to Behavior Space:
http://netlogo-users.18673.x6.nabble.com/Behaviorspace-Memory-Leak-td5003468.html
I have found the same symptoms. My model starts out at around 650mb, but over each run the private working set memory rises, to the point where it hits the 1024 limit. I have sufficient memory to raise this, but in reality it will only delay the onset. I am using the table output, as based on previous discussions this helps, and it does, but it only slows the rate of increase. However, eventually the memory usage rises to a point where the PC starts to struggle. I am clearing all data between runs so there should be no hangover. I noticed in the highlighted thread that they were going to run headless. I will try this, but I wondered if anyone else had noticed the issue? My other option is to break the BehSpc simulation into a few batches so the issues never arises, bit i would be nice to let the model run and walk away as it takes around 2 hours to go through.
Some possible next steps:
1) Isolate the exact conditions under which the problem does or not occur. Can you make it happen without involving the nw extension, or not? Does it still happen if you remove some of the code from your model? What if you keep removing code — when does the problem go away? What is the smallest code that still causes the problem? Almost any bug can be demonstrated with only a small amount of code — and finding that smallest demonstration is exactly what is needed in order to track down the cause and fix it.
2) Use standard memory profiling tools for the JVM to see what kind of objects are using the memory. This might provide some clues to possible causes.
In general, we are not receiving other bug reports from users along these lines. It's routine, and has been for many years now, for people to use BehaviorSpace (both headless and not) and do experiments that last for hours or even for days. So whatever it is you're experiencing almost certainly has a more specific cause -- mostly likely, in the nw extension -- that could be isolated.
I have got VIA BSP from the vendor and i have built a WinCE image using Platform builder. When I am trying to bootup the board with that image, It nearly takes 3 to 5 mins to boot.
Please give me a solution...
Thanks in Advance...
3 to 5 minutes indicates that there's an issue in the startup sequence. The most common item I've seen that causes extremely slow booting is that having KITL enabled in the OS build but not attaching from Platform Builder. What happens in this case is that the OS begins the startup sequence and then waits for a KITL connection for a long time before timing out and continuing the boot process.
That doesn't mean that this is your specific problem - you've not really told us anything to help us help you - this is just a slightly educated guess. What have you done to debug the issue? What does the debug output from the device look like? That would probably help you see if there are any failures. Have you done anything to verify and time driver loading?
The obvious thing would be to include less stuff in the image...
I am encountering some very strange behaviour with a Flex 4.1 app I am writing which gets in the way of testing. It seems that I can reload the app 16 times and then on the 17th, the loading process fails with
Error #2046: The loaded file did not have a valid signature
It seems to be consistently happening on the 17th reload on both Firefox 5.0 and Chrome 12. I am not sure if it's relevant, but I am running Flash Player v10.2.159.1 (also happens with 10.3.181.34) on Ubuntu 10.04. Happens with both regular and debugger versions of the player. When I run the app on Windows FF5, it doesn't seem to happen. Closing the current browser window does not seem to fix it. The only way around it is to completely close all browser windows and restart the browser. And then again after 16 successful loads, the 17th fails.
At this point I'm thinking of chalking it as a Linux Flash bug but I'd like to make sure and check if anyone knows if there's something I should be doing to prevent this.
The user from this post seems to have had the same problem but I guess he didn't notice the pattern I have.
Any help will be greatly appreciated.
Ruy
== UPDATE ==
I just realized that after my app starts throwing the 2046 error, trying to load any other Flash that uses signed RSLs also shows the 2046 error (e.g. this app), which means the problem is not specific to my app and most likely related to the Flash cache or something of the sort.
Disclosure: I am a Flash Player Developer at Adobe.
This is unlikely to get much attention as it is Linux only and kind of an edge case: Probably annoying during dev work but very few users will reload the same page more than 16 times. It might also be a browser issue. But it is probably us :) I will look at the jira tomorrow and see if I can bump it up a bit, but I'll be honest in that it is really an edge case and unlikely to get much love. If you want to increase your chances make sure to add the most simple .swf test case you can make to the bug. Also please double check if it still happens with the latest beta.
I also just took a look at the earlier bug reports and forum posts, you probably should post this as a Flash Player bug, not as Flex.
Long shot guess, but it sounds similar to a problem we had.... in the project properties - Flex Build Path - Framework Linkage - change to "merged into code". This fixes a problem very similar to what you are describing, though I wish I knew exactly what the cause is. Good luck!
tl;dr: No idea on the cause, posting random possibility in hope it might give someone else an idea or two for testing.
Considering that it seems to be an unresolved bug in Adobe issue tracker, its unlikely that you will get any definitive answer here. Considering it occurs on both Firefox & Chrome, let's rule out browser bugs and assume it is in either some common library (Flash) or OS API (Linux kernel implementation). A comment in one of the jira issues specifically mentions killing Flash process fixes it, so its a Flash issue and not OS bug.
The most interesting thing I can see here is your observation that it succeeds for exactly 16 times before failing to load. Time for some speculation here, from someone who's never worked on kernel or crypto dev:
With a 2048 bit RSA key and 32k cache for storing them, 16 keys would fit before adding another one fails - so one conjecture is that each time this file is loaded, Flash is caching the signed value (possibly a hashed version) for some reason - maybe to keep track of allowed & used security permissions etc.? If this entry is not removed, then once it is full all file loads will fail if caching the signature is part of checking it.
Things you can experiment with:
Reduce size of app to see if page can be reloaded more often (as suggested by stackfish)
Count number of signed RSLs used and if its a power/multiple of 2 (maybe others get the error after 32 page loads if they use half the no. of signed libs?)
Check if Linux Flash plugin has some option to increase credentials cache or something (or decrease it, just to see if it impacts the no. of loads - if so, could be related to the problem)
I expect that to actually find a solution, you'd have to dive into the library loading code and look at all constants related to loading signed libs that are 4, 16, or a multiple of 16 to see if they might be responsible - in short, unlikely to be soluble by others outside of Flash dev team imho :/
This behavior could be related to a memory leak caused either by the Flex implementation, or the browser plugin. Firefox is notorious for not cleaning up memory anyway and the footprint will continue to grow the longer you have the same browser window open.
If you reduce the size of your flex app to produce something very tiny, does the number of times you can reload the page go up?
Error #2046 on win vista, 64 bit machine wit 1000 mb ati radeon videocard
problem occurs only in msn video sofar
I meet a same problem when I use ppt on icourse163.org . when I open the course site, I can't see the ppt but I use chrome can do it .there are the same flash version(32.0.0.344),and Then ,I copy the tar.gz file that downloaded from adobe.
usr/* to /usr.I solved it.wish can help you .
I've legacy code that uses SetWaitableTimer to perform some task at 10 sec after midnight.
SetWaitableTimer has the following feature, which is used in the code:
If the system time is adjusted, the
due time of any outstanding absolute
timers is adjusted.
I'm porting code to gcc/Linux. How I can simulate the above behaviour?
This is a pretty good overview of linux timer functions. You want the timer_create() / timer_delete() family with CLOCK_REALTIME, then timer_settime() with TIMER_ABSTIME. According to this FAQ it should be adjusted if there is a change to the system clock though I have never tested it.