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  • How can I force mod_perl to only allow one process per connection?

    - by Charles Ma
    I have a perl cgi script that's fairly resource intensive (takes about 2 seconds to finish). This is fine as long as only at most 4 or 5 of them are running at the same time and that's usually the case. The problem is that when a user clicks a link that calls this script, a new process is spawned to handle that connection request, so if a user clicks many times (if they're impatient), the server gets overloaded with new processes running and most of them are redundant. How can I ensure that only one instance of this process is running per host? This is an old system that I'm maintaining which uses an old framework for the frontend, and I would like to avoid using javascript to disable the button client side if possible. Converting this to fast-cgi perl is out of the question as well, again because this is an old system and adding fast-cgi to apache might break a lot of other things that this thing runs.

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  • Unix Piping using Fork and Dup

    - by Jacob
    Lets say within my program I want to execute two child processes, one to to execute a "ls -al" command and then pipe that into "wc" command and display the output on the terminal. How can I do this using pipe file descriptors so far the code I have written: An example would be greatly helpful int main(int argc, char *argv[]) { int pipefd[2] pipe(pipefd2); if ((fork()) == 0) { dup2(pipefd2[1],STDOUT_FILENO); close(pipefd2[0]); close(pipefd2[1]); execl("ls", "ls","-al", NULL); exit(EXIT_FAILURE); } if ((fork()) == 0){ dup2(pipefd2[0],STDIN_FILENO); close(pipefd2[0]); close(pipefd2[1]); execl("/usr/bin/wc","wc",NULL); exit(EXIT_FAILURE); } close(pipefd[0]); close(pipefd[1]); close(pipefd2[0]); close(pipefd2[1]); }

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  • Avoiding problem of overwriting files which are in use

    - by zaf
    For example on a high traffic web server. To reduce problems when switching a file I usually rename the old file out and then rename in the new file. I was told some time ago that renaming a file does not change the 'inode data' so that processes reading the file can keep doing so without glitches. And, of course, rather than copying in the new file it is faster and safer to rename a temp copy. Is this still best practice and if not what do you do?

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  • How to feed data over STDIN to multiple external commands in ruby.

    - by Erik
    This question is a bit like my previous (answered) question: How to run multiple external commands in the background in ruby. But, in this case I am looking for a way to feed ruby strings over STDIN to external processes, something like this (the code below is not valid but illustrates my goal): #!/usr/bin/ruby str1 = 'In reality a relatively large string.....' str2 = 'Another large string' str3 = 'etc..' spawn 'some_command.sh', :stdin => str1 spawn 'some_command.sh', :stdin => str2 spawn 'some_command.sh', :stdin => str3 Process.waitall

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  • I have many processes in my usecase , is this normal ?

    - by BugKiller
    Hi, I'm working now on a big system that consists of many subsystems , each subsystem depends on the other. I wrote a usecase for this system , but I note that I have many processes in my usecase ( more than 40 processes ! ) . it looks like this : Group subsystem: add Group. remove Group. join to Group. upload file. create poll. remove file. remove poll. write post/topic close post. edit post. .... Messages Centers send message view inbox read message. and so on .. each user interacts with these processes . How can I reduce the number of these processes? Is it possible to divide the usecase processes into many pages?

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  • Using Java, can I have one JVM spawn another, and then have the original one exit?

    - by CarlG
    I have a need to have a running JVM start another JVM and then exit. I'm currently trying to do this via Runtime.getRuntime().exec(). The other JVM starts, but my original JVM won't exit until the "child" JVM process stops. It appears that using Runtime.getRuntime().exec() creates a parent-child relationship between the processes. Is there some way to de-couple the spawned process so that the parent can die, or some other mechanism to spawn a process without any relationship to the creating process? Note that this seems exactly like this question: http://stackoverflow.com/questions/2566502/using-java-to-spawn-a-process-and-keep-it-running-after-parent-quits but the accepted answer there doesn't actually work, at least not on my system (Windows 7, Java 5 and 6). It seems that maybe this is a platform-dependent behavior. I'm looking for a platform independent way to reliably invoke the other process and let my original process die.

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  • apache2: bad user name www-data

    - by Robert Ross
    Starting web server apache2 apache2: bad user name www-data I just tried restarting my webserver because of an update I did to my php.ini and originally I was getting something about the PID file being overwritten. Now I just get this: * Starting web server apache2 apache2: bad user name www-data this has NEVER happened before, and I haven't changed and permissions or apache2 configuration files. What gives?

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  • Pausing and restarting an Animation

    - by Sandeep
    I'm running a CAKeyframeAnimation in a subclass of UIViewController. I want to pause the animation on pressing a "Pause" button and start back from where it paused on pressing a "Resume" button. I've come across an answer to a similar question on this site, but it doesn't work for me. I would appreciate any help.

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  • How do i restart my linux server in every 2 days via crontab?

    - by Barkat Ullah
    I have a Linux server containing the os version below: Linux 2.6.32-220.7.1.el6.x86_64 I want to restart it in every 2 days, please help me, I want to do it via crontab. Another help, I used a code below to drop my memory caches in every hour. 0 * * * * /root/clearcache.sh #!/bin/sh sync; echo 3 > /proc/sys/vm/drop_caches But 1st 15 in every hour my server remain so slow after cleaning the caches. My sites do not load during every hour in 1st 15 minutes. In another way if I restart my server then also caches are removed. So I decided to restart my server in every 2 days to drop my caches. Will it be helpful to restart? Or is there any other way to drop my memory caches that will not down my server?

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  • Why my samba printer is not visible (after boot) until i restart smb ?

    - by j23tom
    I've an old hp1100 and ubuntu 9.10 and now upgraded to lucid prerelease. I can't see my printer on network (using smb://mycomputer on nautilus or \mycomputr from xp). As long as i will not restart smbd (on lucid: sudo restart smbd) my printer is not visible as network share. All file shares are always visible. My printer is visible and working after smbd restart Any clue what might cause this ?

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  • ps forrest for session id

    - by azatoth
    Often I want to get a nice readout what process are running and their relationship; I usually by habit runs ps auxfww and eventual grep for the process in question. Having been thinking about the problem I tried to create an oneliner to get the process tree in ps ufww format for all processes which has the session id specified by arbitrary process name(s); ending up in following code: ps ufww --sid=$(ps -C apache2 -o sess --no-headers | sort | uniq | grep -v -E '^ +0$' | awk 'NR==1{x=$0;next}NF{x=x","$0};END{gsub(/[[:space:]]*/,"",x);print x}') giving for example following output: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 4157 0.0 0.1 41264 3120 ? Ss Jun11 0:00 /usr/sbin/apache2 -k start www-data 4329 0.0 0.0 41264 1976 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 4330 0.0 0.0 41264 2028 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 4331 0.0 0.0 41264 2028 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 4332 0.0 0.0 41264 2028 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 4333 0.0 0.0 41264 2032 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 6648 0.0 0.0 41264 1884 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 6654 0.0 0.0 41264 1884 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start www-data 6655 0.0 0.0 41264 1884 ? S Jun11 0:00 \_ /usr/sbin/apache2 -k start I do wonder now if anyone has an better idea to solve this issue? Are there anything out there that is easier to "oneline" and gives above or better information? For example I would actually want to have included all childs relative any parent. (uncertain if this should be on SF instead, but felt it was more like an programming question)

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  • Why does RunDLL32 process exit early on Windows 7?

    - by Vicky
    On Windows XP and Vista, I can run this code: STARTUPINFO si; PROCESS_INFORMATION pi; BOOL bResult = FALSE; ZeroMemory(&pi, sizeof(pi)); ZeroMemory(&si, sizeof(si)); si.cb = sizeof(STARTUPINFO); si.dwFlags = STARTF_USESHOWWINDOW; si.wShowWindow = SW_SHOW; bResult = CreateProcess(NULL, "rundll32.exe shell32.dll,Control_RunDLL modem.cpl", NULL, NULL, FALSE, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi); if (bResult) { WaitForSingleObject(pi.hProcess, INFINITE); CloseHandle(pi.hProcess); CloseHandle(pi.hThread); } and it operates as I would expect, i.e. the WaitForSingleObject does not return until the Modem Control Panel window has been closed by the user. On Windows 7, the same code, WaitForSingleObject returns straight away (with a return code of 0 indicating that the object signalled the requested state). Similarly, if I take it to the command line, on XP and Vista I can run start /wait rundll32.exe shell32.dll,Control_RunDLL modem.cpl and it does not return control to the command prompt until the Control Panel window is closed, but on Windows 7 it returns immediately. Is this a change in RunDll32? I know MS made some changes to RunDll32 in Windows 7 for UAC, and it looks from these experiments as though one of those changes might have involved spawning an additional process to display the window, and allowing the originating process to exit. The only thing that makes me think this might not be the case is that using a process explorer that shows the creation and destruction of processes, I do not see anything additional being created beyond the called rundll32 process itself. Any other way I can solve this? I just don't want the function to return until the control panel window is closed.

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  • Tips on managing dependencies for a release?

    - by Andrew Murray
    Our system comprises many .NET websites, class libraries, and a MSSQL database. We use SVN for source control and TeamCity to automatically build to a Test server. Our team is normally working on 4 or 5 projects at a time. We try to lump many changes into a largish rollout every 2-4 weeks. My problem is with keeping track of all the dependencies for a rollout. Example: Website A cannot go live until we've rolled out Branch X of Class library B, built in turn against the Trunk of Class library C, which needs Config Updates Y and Z and Database Update D, which needs Migration Script E... It gets even more complex - like making sure each developer's project is actually compatible with the others and are building against the same versions. Yes, this is a management issue as much as a technical issue. Currently our non-optimal solution is: a whiteboard listing features that haven't gone live yet relying on our memory and intuition when planning the rollout, until we're pretty sure we've thought of everything... a dry-run on our Staging environment. It's a good indication but we're often not sure if Staging is 100% in sync with Live - part of the problem I'm hoping to solve. some amount of winging it on rollout day. So far so good, minus a few close calls. But as our system grows, I'd like a more scientific release management system allowing for more flexibility, like being able to roll out a single change or bugfix on it's own, safe in the knowledge that it won't break anything else. I'm guessing the best solution involves some sort of version numbering system, and perhaps using a project management tool. We're a start-up, so we're not too hot on religiously sticking to rigid processes, but we're happy to start, providing it doesn't add more overhead than it's worth. I'd love to hear advice from other teams who have solved this problem.

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  • How do I create an inheritable Semaphore in .NET?

    - by pauldoo
    I am trying to create a Win32 Semaphore object which is inheritable. This means that any child processes I launch may automatically have the right to act on the same Win32 object. My code currently looks as follows: Semaphore semaphore = new Semaphore(0, 10); Process process = Process.Start(pathToExecutable, arguments); But the semaphore object in this code cannot be used by the child process. The code I am writing is a port of come working C++. The old C++ code achieves this by the following: SECURITY_ATTRIBUTES security = {0}; security.nLength = sizeof(security); security.bInheritHandle = TRUE; HANDLE semaphore = CreateSemaphore(&security, 0, LONG_MAX, NULL); Then later when CreateProcess is called the bInheritHandles argument is set to TRUE. (In both the C# and C++ case I am using the same child process (which is C++). It takes the semaphore ID on command line, and uses the value directly in a call to ReleaseSemaphore.) I suspect I need to construct a special SemaphoreSecurity or ProcessStartInfo object, but I haven't figured it out yet.

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  • How can I write simulations in Erlang?

    - by rick
    Hi guys, I want to do some numerical stuff in Erlang like this: You've got an array with the following values: [2,3,4] In each iteration, you calculate 0.1 * [n-1] + 0.7 *[n] + 0.2 * [n+1] This becomes the new [n]. If n == 0 then [n-1] = 0. If [n] == length of array then [n] = 0. So I try an example: [2,3,4] calculations: 0.1 * 0 + 0.7 * 2 + 0.2 * 3 = 2 0.1 * 2 + 0.7 * 3 + 0.2 * 4 = 3.1 0.1 * 3 + 0.7 * 4 + 0.2 * 0 = 3.1 So [2,3,4] becomes to [2, 3.1, 3.1] after one iteration. I know how to write this in a non-functional language like C. But I have difficulties to imagine, how this could be done in Erlang. I found some tutorials on how you read a file to a list. So this is not the problem. How can I spawn different Erlang processes that each process has one element of the list? How can I do calculations by communicating with 'the neighbors', so that the neighbors know where their neigbors are generically, without specifying each? How can I collect the data into a list? Eventually, is it possible to solve that problem in Erlang at all? Thanks for your help.

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  • How to restart WiFi interface without rebooting (it drops connection)?

    - by Dima
    I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection! How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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  • On restart server Ethernet went down saying not configured!

    - by Sumant
    i justy have configured my dhcp server with static ip. after configuration dhcp server & routers were working fine. but after restarting server network connectivity went off. there are two lan cards but none of them is up.i tried setting up manually ip address again but it remains same. when i executed sudo /etc/init.d/networking restart i got this message * Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces * Reconfiguring network interfaces... /bin/sh: cannot open /etc/iptables_rules: No such file Failed to bring up eth0. i have configured my server according to this What is it the problem with ubuntu 11.10 or some configuration error. i am not getting it please help me.

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  • How can I restart compiz from tty? (& Related, how can I set up a fallback WM?)

    - by Jon
    So I'm testing Natty, and Compiz keeps crashing on me. I expect this sort of thing from alpha software, of course, but it doesn't always give me the option to restart compiz, and for some reason doesn't have a fallback WM configured. Without a window manager, all my programs are still running, but they're not accepting input from the keyboard, and I can't switch between them. I can, however, press Ctrl+Alt+F1 and get a terminal, and I can killall Xorg to reset everything, but I'd rather just reset compiz if possible. If I try typing compiz --replace there in the tty, it complains "fatal--couldn't open display." Is there a way to have tty1 restart compiz? Like compiz --replace --display=something? Additionally, is there a way to configure a fallback window manager so that there's an easier way to recover from compiz crashing?

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  • How to restart WiFi interface without rebooting (it drops connection)?

    - by Dima
    I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection! How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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  • AIDL based two way communication

    - by sshasan
    I have two apps between which I want some data exchanged. As they are running in different processes, so, I am using AIDL to communicate between them. Now, everything is happening really great in one direction (say my apps are A and B) i.e. data is being sent from A to B but, now I need to send some data from B to A. I noticed that we need to include the app with the AIDL in the build path of app where the AIDL method will be called. So in my case A includes B in its build path. For B to be able to send something to A, by that logic, B would need A in its build path. This would create a cycle. I am stuck at this point. And I cannot think of a work around this loop. Any help would be greatly appreciated :) . Thanks! ----EDIT---- So, I following the advice mentioned in one of the comments below, I have the following code In the IPCAIDL project the AIDL file resides, its contents are package ipc.android.aidl; interface Iaidl{ boolean pushBoolean(boolean flag); } This project is being used as a library in both the IPCServer and the IPC Client. The IPCServer Project has the service which defines what happens with the AIDL method. The file is booleanService.java package ipc.android.server; import ipc.android.aidl.Iaidl; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.os.RemoteException; import android.util.Log; public class booleanService extends Service { @Override public IBinder onBind(Intent intent) { return new Iaidl.Stub() { @Override public boolean pushBoolean(boolean arg0) throws RemoteException { Log.i("SERVER(IPC AIDL)", "Truth Value:"+arg0); return arg0; } }; } } The IPCClient file which calls this method is package ipc.android.client2; import ipc.android.aidl.Iaidl; import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.os.RemoteException; import android.view.View; import android.widget.Button; public class IPCClient2Activity extends Activity { Button b1; Iaidl iAIDL; boolean k = false; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); bindService(new Intent("ipc.android.server.booleanService"), conn, Context.BIND_AUTO_CREATE); startService(new Intent("ipc.android.server.booleanService")); b1 = (Button) findViewById(R.id.button1); b1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(k){ k = false; } else{ k = true; } try { iAIDL.pushBoolean(k); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } private ServiceConnection conn = new ServiceConnection() { @Override public void onServiceDisconnected(ComponentName name) { // TODO Auto-generated method stub } @Override public void onServiceConnected(ComponentName name, IBinder service) { iAIDL = Iaidl.Stub.asInterface(service); } }; } The manifest file for IPCServer includes the declaration of the service.

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  • SQL SERVER – #TechEdIn – Presenting Tomorrow on Speed Up! – Parallel Processes and Unparalleled Performance at TechEd India 2012

    - by pinaldave
    Performance tuning is always a very hot topic when it is about SQL Server. SQL Server Performance Tuning is a very challenging subject that requires expertise in Database Administration and Database Development. I always have enjoyed talking about SQL Server Performance tuning subject. However, in India, it’s actually the very first time someone is presenting on this interesting subject, so this time I had the biggest challenge to present this session. Frequently enough, we get these two kind of questions: How to turn off parallelism as it is reducing performance? How to turn on parallelism as I want more performance? The reality is that not everyone knows what exactly is needed by their system. In this session, I have attempted to answer this very question. I’ve decided to provide a balanced view but stay away from theory, which leads us to say “It depends”. The session will have a clear message about this towards its end. Deck Details Slides: 45+ Demos: 7+ Bonus Quiz: 5 Images: 10+ Session delivery time: 52 Mins + 8 Mins of Q & A I have presented this session a couple of times to my friends and so far have received good feedback. Oftentimes, when people hear that I am going to present 45 slides, they all say it is too much to cover. However, when I am done with the session the usual reaction is that I truly gave justice to those slides. Action Item Here are a few of the action items for all of those who are going to attend this session: If you want to attend the session, just come early. There’s a good chance that you may not get a seat because right before me, there is a session from SQL Guru Vinod Kumar. He performs a powerful delivery of million concepts in just a little time. Quiz. I will be asking few questions during the session as well as before the session starts. If you get the correct answer, I will give unique learning material for you. You may not want to miss this learning opportunity at any cosst. Session Details Title: Speed Up! – Parallel Processes and Unparalleled Performance (Add to Calendar) Abstract: “More CPU, More Performance” – A  very common understanding is that usage of multiple CPUs can improve the performance of the query. To get a maximum performance out of any query, one has to master various aspects of the parallel processes. In this deep-dive session, we will explore this complex subject with a very simple interactive demo. Attendees will walk away with proper understanding of CX_PACKET wait types, MAXDOP, parallelism threshold and various other concepts. Date and Time: March 23, 2012, 12:15 to 13:15 Location: Hotel Lalit Ashok - Kumara Krupa High Grounds, Bengaluru – 560001, Karnataka, India. Add to Calendar Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Interview Questions and Answers, SQL Query, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Technology

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  • How can I run this script on startup, restart, and shutdown?

    - by Exeleration-G
    I'm using Ubuntu 11.10. I've written a script, that synchronises a directory in ~ with a directory on /dev/sda4, using Unison. Before, I had this script running every five minutes with no problems, using crontab. Right now, I want to execute this script at startup, restart and shutdown only. This is what the script looks like: #!/bin/bash unison -perms 0 -batch "/mnt/Data/Syncfolder/" "/home/myname/Syncfolder/" My crontab configuration was as follows: m h dom mon dow command 0,5,10,15,20,25,30,35,40,45,50,55 * * * * sh /usr/local/bin/s4lj.bash Note that I copied the script from ~ to /usr/local/bin/ first, to avoid root problems. I've read How to execute script on shutdown? and How to write an init script that will execute an existing start script?. After doing that, I've done this: I've made s4lj.bash executable, and then copied it to /etc/init.d/. For startup, I've made a symlink in /etc/rc2.d/ to /etc/init.d/s4lj.bash, and renamed it to S70s4lj.bash. For restart, I've made a symlink in /etc/rc6.d/ to /etc/init.d/s4lj.bash, and renamed it to K70s4lj.bash. For shutdown, I've made a symlink in /etc/rc0.d/ to /etc/init.d/s4lj.bash, and renamed it to K70s4lj.bash. Still, the script won't be run in any of these situations. How can I make the script get executed? I'd be happiest with a proper *.conf file in /etc/init. Thanks in advance.

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  • Implementing set of processes in a stored procedure or through the code?

    - by just_name
    I want to know what's the suitable method to implement the following case (best practice). If i make a set of processes like this : 1- select data from set of DB tables. 2- loop on the selected result . 3- Make some checks on each iteration . 4- Insert the result in another table . Implementing the previous steps in a stored procedure or in a transaction through my code (asp.net) . ? Concerning the performance , security and reliability issues .

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