Process synchronization strategy

Trying not to reinvent the wheel...
I have started redesigning an old data acquisition/processing application using as much parallelism as possible.
UI/DAQ/Data Saving/Data Processing/Data Display are all handled in separate loops or VIs which communicate and exchange data via queues or notifiers. This works fine so far.
Then I realized that the way I provided the data processed by Data Processing (DP) to Display (D) tasks was not going to work in all circumstances.
I use a notifier, so that several D tasks can access the data and such that there is not much memory cost (no queue) if the D tasks can't keep up. If data is generated faster than the D tasks can get it, then they miss some but get a chance to catch up later or at least get some data every now and then. That was what I had in mind originally.
Then I realized that I may want to display all processed data (for instance offline). This architecture won't work. If I were to keep the data notifier approach, I would need a way to tell the DP task to send data to the notifier only when all D tasks are done with their previous chunk of data.
What is the best way to achieve that? I need to be able to change the number of clients (D tasks) dynamically, so I thought RendezVous might work. But then looking at the example "Wait for All Notifications Demo.vi", it seemed that this might be a more natural approach but a bit tedious to handle since the notifiers would be created (and destroyed() dynamically in separate VIs...
The point is that I want DP to know how many clients it is supposed to wait for (at all time) before sending a new notification (with new data).
Thanks for your feedback.
X.
Solved!
Go to Solution.

Hi Daklu,
My original idea was to deal with either a case where all clients are D's or with a case where all are D*'s, but upon reading your answer, I am thinking of including that third case where both types can exist... But that would be for a "live mode" situation, not an offline one, which is the one I was discussing (in other words, a situation where all clients are D*'s).
As far as I can see, the solutions you offer don't solve the problem I foresee in the offline mode (where I "replay" saved data). If data processing is much faster than data display (and again, "display" is a simplification, there will be some post-processing involved), then both solutions will create massive queues (or queues of events?) and that's precisely what I want to avoid. I'd like to have DP know when all its clients are ready for more and only then "output" data (or process some more if need be).
I can think of "classic" ways of letting the clients register with DP, send messages when they are done or when they quit, etc, but I can't really find a way of avoiding to have DP be stuck in a polling loop waiting for these communications to be over before going for a new round of data. Maybe the overhead of having a polling loop is not that much of deal in offline mode, after all? I just wanted to make sure I am not missing a neat LabVIEW feature I don't know about before resorting to an old fashioned approach from my limited set of skills.
In particular, I think it would be nice to have the notifier be able to check how many registered clients have received the last notification (either as a "Get #Clients Having Received Last Notification" function - which would however require polling to make sure all clients have received it, so not really what I am looking for-, or better, as a "Wait for All Registered Clients to Receive Last Notification" function (with timeout)).
Thanks for reading.
X.

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Message was edited by:
perigee_dev2
Message was edited by:
perigee_dev2

The first time we insert a row for a file in the
table ADSOTEXT, Oracle will process synchronization
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But if we update file information, so we make an
update for this file on an existing row of the
table,
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information relating to that file and process
synchronizaton 30 minutes later : this is
a little bit annoying because we won't be able to
find this file through a search for around 30
minutes.Yes it is so. Friend of me have this issue too. I personaly use ctxcat index and build of this index is transactional - after commit.
Is there a way to make those 2 steps made at the same
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Do you use 10g?
dap

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at com.sap.ip.me.core.InstallationSequenceInstallTrigger.userLoggedOn(InstallationSequenceInstallTrigger.java:40)
at com.sap.ip.me.core.UserManagerImpl.fireLogon(UserManagerImpl.java:2336)
at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:785)
at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:763)
at com.sap.ip.me.awtapps.home.LoginDialog.actionOk(LoginDialog.java:377)
at com.sap.ip.me.awtapps.home.LoginDialog.exitDialogOk(LoginDialog.java:361)
at com.sap.ip.me.awtapps.home.AWTDialog.handleEvent(AWTDialog.java:99)
at java.awt.Window.postEvent(Window.java:1614)
at java.awt.Component.postEvent(Component.java:3895)
at java.awt.Component.postEvent(Component.java:3895)
at java.awt.Component.postEvent(Component.java:3895)
at java.awt.Component.dispatchEventImpl(Component.java:3631)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1713)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:627)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592)
at java.awt.Component.dispatchEventImpl(Component.java:3506)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)
at java.awt.Dialog$1.run(Dialog.java:540)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
Nested exception:
com.sap.ip.me.core.InstallationException: Cannot download installation file
at com.sap.ip.me.core.AwtApplicationType.downloadInstallationFile(AwtApplicationType.java:349)
at com.sap.ip.me.core.AwtApplicationType.install(AwtApplicationType.java:62)
at com.sap.ip.me.core.ApplicationManager.installApplication(ApplicationManager.java:791)
at com.sap.ip.me.apps.InstallationScenarioApplicationType.install(InstallationScenarioApplicationType.java:189)
at com.sap.ip.me.apps.InstallationScenarioApplicationType.install(InstallationScenarioApplicationType.java:131)
at com.sap.ip.me.core.ApplicationManager.installApplication(ApplicationManager.java:789)
at com.sap.ip.me.core.InstallationSequenceInstallTrigger.continueInstallation(InstallationSequenceInstallTrigger.java:55)
at com.sap.ip.me.core.InstallationSequenceInstallTrigger.userLoggedOn(InstallationSequenceInstallTrigger.java:40)
at com.sap.ip.me.core.UserManagerImpl.fireLogon(UserManagerImpl.java:2336)
at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:785)
at com.sap.ip.me.core.UserManagerImpl.logOnUser(UserManagerImpl.java:763)
at com.sap.ip.me.awtapps.home.LoginDialog.actionOk(LoginDialog.java:377)
at com.sap.ip.me.awtapps.home.LoginDialog.exitDialogOk(LoginDialog.java:361)
at com.sap.ip.me.awtapps.home.AWTDialog.handleEvent(AWTDialog.java:99)
at java.awt.Window.postEvent(Window.java:1614)
at java.awt.Component.postEvent(Component.java:3895)
at java.awt.Component.postEvent(Component.java:3895)
at java.awt.Component.postEvent(Component.java:3895)
at java.awt.Component.dispatchEventImpl(Component.java:3631)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1713)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:627)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592)
at java.awt.Component.dispatchEventImpl(Component.java:3506)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)
at java.awt.Dialog$1.run(Dialog.java:540)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
20080121 13:04:22:531 W MI/Sync Container Type:R,Id:47927980AECA0BA3E10000000A126235,SId:0,Items:0,MaxI:0 does not contain a conversation id, use defaull: MI46443032435a4558 / 4792758FAECA0BA3E10000000A126235 (User: FD02CZEX, MSD: Name: / MOBILEENGINE_AWT (V. 70128), Target=, Type=com.sap.ip.me.core.FrameworkApplicationType)
Thanks and regards,
Frank

Hi Frank,
just as a comment:
A client reset is not always necessary after an application update. If you just update a view or so, that is absolutely fine. But if you change the persistence (MEREPMETA.XML) then you need the client reset. This reset reads the MEREPMETA file again and generates the persistence based on these informations. So this part is not really missing in the coding, cause you do not really know if this is necessary or not. On the other side: having the ability to trigger a client reset in the INSTALL.XML file would perhaps be a great option.
Regards,
Oliver

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