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  • Force redraw before long running operations

    - by Joshua
    When you have a button, and do something like: Private Function Button_OnClick Button.Enabled = False [LONG OPERATION] End Function Then the button will not be grayed, because the long operation prevents the UI thread from repainting the control. I know the right design is to start a background thread / dispatcher, but sometimes that's too much hassle for a simple operation. So how do I force the button to redraw in disabled state? I tried .UpdateLayout() on the Button, but it didn't have any effects. I also tried System.Windows.Forms.DoEvents() which normally works when using WinForms, but it also had no effect.

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  • I'm asked to tune a long starting app into a short time period

    - by Jason
    Hi, I'm asked to shorten the startup period of a long starting app, however I have also to obligate to my managers to the amount of time i will reduce the startup - something like 10-20 seconds. As i'm new in my company I said I can obligate with timeframe of months (its a big server and I'm new and i plan to do lazy load + performance tuning). that answer was not accepted I was required to do some kind of a cache to hold important data in another server and then when my server starts up it would reach all its data from that cache - I find it a kind of a workaround and i don't really like it. do you like it? what do you think I should do? any suggestions? PS when i profiled the app i saw many small issues that make the startup long (like 2 minutes) it would not be a short process to fix all and to make lazy load. Any kind of suggestions would help. language - java. Thanks

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  • C++ : size of int, long, etc...

    - by Jérôme
    I'm looking for detailed informations regarding the size of basic C++ types. I know that it depends on the architecture (16 bits, 32 bits, 64 bits) and the compiler. But are there any standards ? I'm using Visual Studio 2008 on a 32 bit achitecture. Here is what I get : char : 1 byte short : 2 bytes int : 4 bytes long : 4 bytes float : 4 bytes double : 8 bytes I tried to find, without much success, reliable informations telling the sizes of char, short, int , long, double, float (and other types I don't think of) under different architecture and compiler.

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  • How long until programming becomes a professionally certified (and respected as such) skill such as

    - by Michael Campbell
    Given Toyota's recent issues and the ENORMOUS amount of safety that is being relegated to computers, how long do you think it will be before programming, or perhaps programming certain things (embedded transportation software, (air) traffic control, electrical grid, hospital equipment, nuclear plant security, planes, etc.) becomes regulated? And/or, how long before there will be certain regulated certifications before you can call yourself a "software developer", like Architects and Engineers have now? (NB: I'm from the US, so I don't know how it works in other countries; please forgive my ignornace.)

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  • C# - How to convert 10 bytes to unsigned long

    - by Justin
    Hey, I have 10 bytes - 4 bytes of low order, 4 bytes of high order, 2 bytes of highest order - that I need to convert to an unsigned long. I've tried a couple different methods but neither of them worked: Try #1: var id = BitConverter.ToUInt64(buffer, 0); Try #2: var id = GetID(buffer, 0); long GetID(byte[] buffer, int startIndex) { var lowOrderUnitId = BitConverter.ToUInt32(buffer, startIndex); var highOrderUnitId = BitConverter.ToUInt32(buffer, startIndex + 4); var highestOrderUnitId = BitConverter.ToUInt16(buffer, startIndex + 8); return lowOrderUnitId + (highOrderUnitId * 100000000) + (highestOrderUnitId * 10000000000000000); } Any help would be appreciated, thanks!

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  • Java Web Server with Jetty - TCP Connections Taking Long

    - by daysleeper
    I have an application with fairly high traffic (20K req/min) running on the JVM with a Jetty servlet container on Ubuntu. Below is my Jetty configuration: 10 20 2000 2 When I analyze the network traffic, I realize that sometimes it is taking long to establish TCP connections on the port that Jetty is running. The long connections are varying between 3.0s and 9.0s. The port is configured to accept MAX number of TCP connections. Do you know what might be causing the delay in accepting connections? Thanks

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  • Process AJAX response with long runing tasks

    - by mpz
    I have long time task in controller action. I use delayed job for it. (Also in heroku it is good practice for perfomance - dyno must work for small time in each request) But my client need result of it work and users can wait on that task. It is more clear: no any addition models or records in it, simple view and js... I think about such way: On client run AJAX with very long timeout (5 min for example) Client make request to server as usual On controller in action1 def start_work (with delay work setup) i need NO any response to client After work performs (delay job finished) i need run new action2 with response to client Client recieve response after about 1-5 min It is possible?

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  • converting ip to long string in mysql command !

    - by Mac Taylor
    hey guys I'm trying to use ip2country technique to show my users'flags simple thing to do is to write a sql statement and show users from session table and then query to see if their ip is in what range and show their flags it simple but dengerous becuase when showing 300 users online and fetching from session table and then query once again ip2country table to get the flags there will be surelly memory overusage problem now i wrote a query to make it in one query : SELECT s.session_ip,ipc.* FROM session s left join ip2country ipc ON ipc.ip_lo<=s.session_ip AND ipc.ip_hi>=s.session_ip WHERE s.session_time > '".( time() - 60) )."' now its clear above query is wrong cause ips saved in ip2country table is long string 1000013824 and ips saved in session table are real ip e.g. 193.169.0.0 now i know how to convert from ip to long in php ip2long() but is there any command in mysql to do it with out building another query !?

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  • SqlDataAdapter.Fill suddenly taking a long time

    - by WraithNath
    I have an application with a central DataTier that can execute a query to a data table using an SQLDataAdapter. None of this code has changed but now all queries are taking at least 10x as long to execute a query returning even one record. The only difference is that I have been using the app in a VM but the issue has started mid way through using the application. eg, the speed issue has not manifested itself from the start of using the VM, rather half way through. Has anyone else had an issue with the SQL Data Adapter taking a long time to fill for no reason? executing the query in Management studio it runs in less than a second. Firewalls are disabled

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  • Java date long value changed after insert, select query

    - by StackExploded
    AFAIK, java Date type is independent from Timezone which means that it represents specific moment of time as long typed value. I found really weird thing here. This is the original value i tried to insert. (http-0.0.0.0-9080-4) 1352955600000 <-- long integer. (http-0.0.0.0-9080-4) Thu Nov 15 00:00:00 EST 2012 <-- User Friendly Format. After i finished inserting into Oracle 11g database, the value has changed! (http-0.0.0.0-9080-4) 1352952000000 (http-0.0.0.0-9080-4) Wed Nov 14 23:00:00 EST 2012 How could this happen?? The more weird thing is it only happens specific environments such as Jboss. I'm currently using below environments. java 1.6 ibatis 2.34 jboss-5.1 (server) tomcat 6.0 (local) oracle 11g Is there anybody who can give me a clue or link to be helpful? it really bugging me!!

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  • C: Comparing two long integers (very strange)

    - by Kyle
    Hi, I have following situation (unix) : x is a long and has value 300 y is a long and has value 50000 if (x <= y) printf("Correct."); if (x > y) printf("Ouch."); Now I always get "Ouch". That means the program keeps telling me that 300 is greater than 50000! It only works again when I do if ((int)x <=(int) y) printf("Correct."); if ((int)x > (int)y) printf("Ouch."); So what is wrong with the comparison operators?

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  • linux process scheduling delayed for long time

    - by Medicine
    I have done strace on my multi-threaded c++ application running on linux after couple hours of running, none of the threads got run, for about 12 seconds. I have seen that the unfinished select system call which is called with a timeout was unfinished before the thread was suspended, reported after it resumed that, it took 11.x seconds for the operation to finish. This is clear indication that the process got starved for a long time. All threads in the process are created with default scheduling policy(SCHED_OTHER) of linux and default priority. There are another 5 similar apps running on the same box which are also heavy I/O bound like this app due to heavy data received on the socket. But most of the time, this app is getting scheduled delay. The other apps are created with same sched policy and priority as this i.e. the defaults. why is only this process gets blocked almost all of the time? Could it be because this process is more I/O intensive as in more busy due to may be higher rates of data? So, the linux dynamic priority adjusting in play here which pushed this process down?

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  • SQLAlchemy session management in long-running process

    - by codeape
    Scenario: A .NET-based application server (Wonderware IAS/System Platform) hosts automation objects that communicate with various equipment on the factory floor. CPython is hosted inside this application server (using Python for .NET). The automation objects have scripting functionality built-in (using a custom, .NET-based language). These scripts call Python functions. The Python functions are part of a system to track Work-In-Progress on the factory floor. The purpose of the system is to track the produced widgets along the process, ensure that the widgets go through the process in the correct order, and check that certain conditions are met along the process. The widget production history and widget state is stored in a relational database, this is where SQLAlchemy plays its part. For example, when a widget passes a scanner, the automation software triggers the following script (written in the application server's custom scripting language): ' wiget_id and scanner_id provided by automation object ' ExecFunction() takes care of calling a CPython function retval = ExecFunction("WidgetScanned", widget_id, scanner_id); ' if the python function raises an Exception, ErrorOccured will be true ' in this case, any errors should cause the production line to stop. if (retval.ErrorOccured) then ProductionLine.Running = False; InformationBoard.DisplayText = "ERROR: " + retval.Exception.Message; InformationBoard.SoundAlarm = True end if; The script calls the WidgetScanned python function: # pywip/functions.py from pywip.database import session from pywip.model import Widget, WidgetHistoryItem from pywip import validation, StatusMessage from datetime import datetime def WidgetScanned(widget_id, scanner_id): widget = session.query(Widget).get(widget_id) validation.validate_widget_passed_scanner(widget, scanner) # raises exception on error widget.history.append(WidgetHistoryItem(timestamp=datetime.now(), action=u"SCANNED", scanner_id=scanner_id)) widget.last_scanner = scanner_id widget.last_update = datetime.now() return StatusMessage("OK") # ... there are a dozen similar functions My question is: How do I best manage SQLAlchemy sessions in this scenario? The application server is a long-running process, typically running months between restarts. The application server is single-threaded. Currently, I do it the following way: I apply a decorator to the functions I make avaliable to the application server: # pywip/iasfunctions.py from pywip import functions def ias_session_handling(func): def _ias_session_handling(*args, **kwargs): try: retval = func(*args, **kwargs) session.commit() return retval except: session.rollback() raise return _ias_session_handling # ... actually I populate this module with decorated versions of all the functions in pywip.functions dynamically WidgetScanned = ias_session_handling(functions.WidgetScanned) Question: Is the decorator above suitable for handling sessions in a long-running process? Should I call session.remove()? The SQLAlchemy session object is a scoped session: # pywip/database.py from sqlalchemy.orm import scoped_session, sessionmaker session = scoped_session(sessionmaker()) I want to keep the session management out of the basic functions. For two reasons: There is another family of functions, sequence functions. The sequence functions call several of the basic functions. One sequence function should equal one database transaction. I need to be able to use the library from other environments. a) From a TurboGears web application. In that case, session management is done by TurboGears. b) From an IPython shell. In that case, commit/rollback will be explicit. (I am truly sorry for the long question. But I felt I needed to explain the scenario. Perhaps not necessary?)

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  • Running Apache for All Local Webpages

    - by waiwai933
    So I've enabled PHP on my Mac OS X 10.5 (Leopard), and it's working great so long as: 1) I place the file in the ~/Sites directory 2) I use the http://localhost/~user/example.php URL instead of the file:///Users/user/Sites/example.php I presume this is because unless both of those conditions are true, Apache is not involved, and thus neither is PHP. So is there any way to remove either of those conditions? (Well, really the latter, because the first is a symptom of the second)

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  • Running multiple FCGI/Django on Nginx for load sharing

    - by Barry
    I am running a web-service on Nginx/FastCGI/Django. Our processing time is fairly long and CPU intensive and I would like to be able to run multiple processes of Django/FastCGI to share the load. How do I set Nginx to rout requests from a single source to multiple instances of Django/FastCGI? (I can run the multiple instances on multiple ports/sockets, but I don't know how to make Nginx share the processing load between them.) Any help much appreciated.

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  • Screen a running process

    - by LiraNuna
    Sometimes I forget to run a program under a screen session and can't stop it in the middle, and I know it's going to take long. Is there a way to screen an already running process without restarting it?

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  • Managing scalability and availability with two servers running Apache Httpd, Apache Mina and MySQL

    - by celalo
    Hello, I am not a developer and I don't much experience with scalable server architectures. But I am in need of a highly available and scalable system for one of my projects. There is going to be two servers I am going to use for the time being. Both with 4 core CPUs and 8 GB RAM with RAID structures running CentOS 5.4. I will also have feature called "Failover IP" which enables to direct an IP address to another server within short time. The applications which will be run on the servers: There is going to be a Java application based on Apache Mina server for handling TCP requests from some hundreds of network devices where the devices are going to send request as much as one request per minute. Handling those requests, includes parsing the requests and inserting a few rows to the Database. Parsing requests before inserting data to the DB does take neglectable time. There is going to be MySQL server, as I stated above. Also there is going to be a PHP web application running on Apache Httpd Server which uses the same DB with the Java application. What I wish to have is to make use of those two servers at the most. I was imagining to have the servers identical, sharing the work load. MySQL could be a cluster maybe? And if some application fails or the whole machine goes down, the other will continue serving the requests seamlessly. Reminding that a "Failover IP" feature will be available for me to take advantage of. Also, It should be kept in mind that number of servers could increase in time, to meet the demand. What can you suggest? Which kind of tools I can make use of? Which kind of monitoring software (paid/unpaid) I have? Thanks in advance.

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  • Android SDK emulator freezes on a Mac running OS X 10.6 Snow Leopard

    - by Donald Burr
    I'm having trouble running the Android SDK on both of my Macs running OS X 10.6.2 Snow Leopard. This appears to be a 64 bit vs. 32 bit issue, as Snow Leopard now defaults to 64-bit everything, including the Java virtual machine. I found this webpage with instructions on how to get the Android tools to run in the 32-bit Java VM, and I am now able to run the Android GUI tool to download SDK files, create AVM's, etc. However, when I try the Hello World tutorial and get to the point where I run my application under the Android emulator, everything goes south. The emulator appears to start but it hangs (spinning beachball of death cursor) without displaying anything. (This only hangs the emulator; the rest of the system still works fine.) If I follow the exact same steps (minus the 32-bit java hack) in a Windows virtual machine, everything works fine. Googling didn't yield anything useful (except for the 32-bit java hack I spoke of earlier). This occurs on both my Mac Pro tower and 13" MacBook Pro. Does anyone have any suggestions?

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  • Problem running Apache-Tomcat on every web browser installed in Windows 7

    - by Kush
    Hello everyone, I'm working on a web application in JSP and my web container is Apache Tomcat 7.0.2 (Its portable cross-platform version). As I've made extensive use of HTML5-CSS3 and my target browser is Google Chrome, I'm able to run the the Apache server only in Opera web browser, neither of the remaining installed browser run it. Here's the steps I have followed to start the server in my Windows 7 machine. -Placing the 'apache-tomcat-7.0.2' directory on my root partition (i.e. C: Drive) -Execute 'startup.bat' from 'bin' directory in it. (startup.sh if on Linux/Unix). -Then, a Console window opens that shows log during the setup of server (separately from Command Prompt), and I need to keep that console running in order to keep the Apache server running, so I minimize it. -Then, I open 'http://localhost:8080/' in various web browsers, and I could see Apache Server Homepage with same address only in Opera Web Browser (11.01), neither of other browsers installed can open it (Chrome 9, Firefox 4 Beta 10 or IE8). -I also tried other port numbers, but none of them worked. What can I do to make Apache run in every browser installed in my computer? I have my computer dual boot with Windows 7 and Ubuntu 10.10, and in Ubuntu, every web browser installed can run Apache once I start it, but same is not working in Windows.

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  • File is not compatible with the version of Windows you're running

    - by vaccano
    I have a really old installer (legacy app) that we are trying to get running on a Windows 7 64 bit os. Previously it has only been installed on Windows XP 32 bit. I get the following error when I try to run it: The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) version of the program, and then contact the software publisher. Contacting the software publisher is not an option (software is super old). Is there a way to get this to work? Some sort of compatibility mode? The only thing I have heard of that will work is a Virtual XP on the Win 7 box. The problem is that this software is a part of a whole software set. I would have to put all of the pieces on the Virtual XP or none at all. Before I go down the road of putting it all on the virtual xp I would like to know that there is no way to get it all on the Win 7 os.

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  • Need Help Accessing the Vista Wampserver localhost from Virtual PC 2007 running an XP VM.

    - by Reg
    (I had posted this on stack overflow but it was suggested there that I post it here instead). I have a Vista laptop on which I'm running wampserver. I have Virtual PC 2007 setup with Windows XP running on the VM. My goal is to be able to use the XP VM to run IE6 to view the localhost in the Vista wampserver. I'm not interested in having the XP VM have any access to the internet -- only to my Vista wampserver's localhost. The vista wampserver works fine. As suggested on a blog I read, I installed the loopback adapter on Vista and I set the loopback to 192.168.21.1 and I set the xp vm ip to 192.168.21.2. I am able to successfully ping the vista-loopback adapter from the xp vm. I've turned the wampserver to "server online", and I've disabled the firewalls in both the vista host and the xp vm. But for some reason, I still can't seem to get the virtual XP to see the localhost on the vista wampserver. I've tried using the vista //name, and I've tried the ip 192.168.21.1 directly and with the port. For whatever its worth, I'm not able to see anything under the XM VM's network places (though I don't know if I'm supposed to be able to see anything). So at this point I'm stuck and I'm still not sure how to get this XP VM to "talk" to my vista wampserver localhost. Any advice on how to fix this problem is much appreciated. Thanks in advance for your help. -R

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  • Apache Reverse Proxy not working inside a VirtualHost running a Mono Web Application

    - by Arwen
    I have a mono web application running with this virtual host below. It is running on Apache 2.2.20 / Ubuntu 11.10. I tried to add a reverse proxy inside this virtualhost so I can make asynchronous or AJAX type calls back to this same domain. My asynchronous requests would have problems in many browsers calling services that are on another domain (cross domain requests problem). I am wanting to do reverse proxy calls to this other service using http://www.whatever.com/monkey/. So, I added the directive and top directive to try to make this work. It is weird though...nothing I do seems to have any effect. I can put the exact same markup in my default website virtualhost file and it works great. What is the deal? Are some of these Mono directives causing problems? <VirtualHost *:80> ServerName www.whatever.com ServerAlias whatever.com *.whatever.com ServerAdmin [email protected] DocumentRoot /home/myuser/web/whatever ProxyRequests off <Proxy *> Order allow,deny Allow from all </Proxy> <Location /monkey/> ProxyPass http://www.google.com/ ProxyPassReverse http://www.google.com/ </Location> MonoServerPath www.whatever.com "/usr/bin/mod-mono-server2" MonoSetEnv www.whatever.com MONO_IOMAP=all MonoApplications www.whatever.com "/:/home/myuser/web/whatever" <Location "/"> Allow from all Order allow,deny MonoSetServerAlias www.whatever.com SetHandler mono SetOutputFilter DEFLATE SetEnvIfNoCase Request_URI "\.(?:gif|jpe?g|png)$" no-gzip dont-vary </Location> <IfModule mod_deflate.c> AddOutputFilterByType DEFLATE text/html text/plain text/xml text/javascript </IfModule> </VirtualHost>

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