How many tasks in one project ?

Hello,
My customer manage large projects with more then 1000 activities and even some of them more then 5000.
Is cproject can manage so many tasks ?
What is the Recommendation for project sizing ?
Regards
Muly Zohar

Hi,
5000 tasks!!!
You will find the answer in SAP Note 1092846.
Regards
Sejo

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How many tasks can I have in NI-DAQmx system?

I am working out of the office this week - please send your response to [email protected] as well as my normal email [email protected].
I am designing a new test platform that will run on C# (because we like object oriented text based programming and because the IDE is free). For hardware we'll use your PXI modules (because your hardware is ultra-reliable). I'm starting with the following PXI modules 6259, 4072, 6509, 2575, and 2569, but we made add other modules later as future requirements demand. I am doing the system software architecture now. I've done some dabbling with Ni_daqmx, and I loathe "tasks" and "channels", but am determined to make them work.
The difficulty I'm having revolves around the overhead with setting up tasks and channels and with the concept of tasks and channels. Help hasn't helped much. Tasks seem to work great if you intend to always collect the same large amount of data from many sources and always will do it in exactly the same way.
We want something much more akin to random access memory. We'll have UUTs of different kinds coming on and off at random times. Sometimes a test will need a simple DC voltage, and other times another test will need 2 seconds worth of data at 1MS/s. It can cost around 150msec to make that change (stop the current task, creat another one, configure anohter channel, start up a new task, blah, blah, task this, channle that - for the life of me I can't understand what this damn taks concept does for me but make matters more complicated and bog down my system).
I can just barely glean from the help that I can have only one analog input task at once, but I can have sevferal taks of several different kinds running at the same time ( a digital output task and another task for digital input, and another task for analong input, etc.) . It does seem that I can set realys without having to put them into a channel and a task (Thank goodness for that - I just wanna turn on a relay I have no idea what a relay "channel" might be.)
In the PXI system I described above I'll have two devices that are analog input devices, the DMM and the Daq. Even with two devices, can I only have one analog input task running? Does that mean I've got to waste 150msec just to switch from the DMM to the Daq? (Do you understand my frustration with "tasks"? - I should be able to say "read DMM" and turn around and say "read Daq channel 0" without having to jump thru task and channle hoops and waste a bunch of time doing it).
I'll also have Daq digital IO and two 6509 digital io modules. Do I have to cram all of that into some "task" concept too? The Daq card has got many other kinds of wonderful capability (frequency measurement, counters, analog output). How many tasks can I have for that stuff? On the DMM card I can measure capacitance amoung other things. Will I have a capacitance task? The idea of a "capacitance task" hurts my head.
Golly I hate tasks. Please help.
I am working out of the office this week - please send your response to [email protected] as well as my normal email [email protected].
Dave

Dave,
Thanks for posting to the NI Forums.
For the good of the community we like to keep conversations that start of the forums on the forums rather than moving to email. If you want to move to email support I recommend contacting NI through the email route.
I will answer your questions here. If you need more direct contact please feel free to contact us through [email protected].
For some the concept of tasks may seem daunting, however, for many applications it makes life a lot more simple. A task at a very fundamental level is simply a collection of channels with a single type (AI, DI, DO, etc.) and a single timing configuration (sampling rate, continuous vs. finite, etc.). It is a way to organize configuration data.
The concept of a task is an abstraction like OO programming. Like OO programming it may take some time to understand but can be a time saver in the end. Also like OO programming it does add some initial programming overhead. It is much more simple to simply type a printf statement in C than to have to create a bunch of classes just to output text to the screen. You can accomplish the same thing not using OO programming, but in the end OO programming is extremely useful, because it groups useful information and methods together in one place.
With very simple applications OO programming sometimes does not make sense. But as a program gets more and more complex OO programming becomes more and more useful. It takes some learning but it is worth it.
I believe the concept of a task does the same thing. It does not change the actual functionality of the device or add excessive overhead. It is just an abstraction that pulls configuration data about a specific "task" and methods the task can perform into a single logical place.
Unlike the entirely abstract concept of an Object, a Task is run on a physical device and therefore has physical limitations. You can create multiple tasks of the same type, but you can only run a one timed task of each type on a single board at a time. In other words you can have multiple AI tasks running at the same time but they need to run on different boards or only one can be timed (have a rate). You can also have multiple timed AI tasks configured for a single board but only one can actually be running at a time.
The reason you can only have a single timed task running at a time is because the M-Series boards (and many other boards as well) have a single timing engine for each type of acquisition or generation. There is a single timing engine for AI, one for AO, and so forth. You cannot have channel 1 running at 1 MS/s and another running at 50 kS/s.
However, tasks can exist even when they are not being actively run. You can create all the tasks you need at the beginning of your program and simply start and stop them as you need. After the task is stopped you do not need to clear the task until the end of your program. You can further increase performance by moving the Task into the latest state possible without actually starting the task. This can be done by calling myTask.Control(TaskAction.Action). The Task states are further explained in the NI-DAQmx Help Manual.
The concept of a task will need to be used with any device that is being programmed using NI-DAQmx. The 6259 and 6509 will need to be programmed using DAQmx. With the 2575 and 2569 you have the choice of either using the NI-DAQmx API or the NI-SWITCH API. The SWITCH API does not use the concept of tasks. For the 4072 you will need to use the NI-DMM API. This API also does not use the concept of tasks.
Hopefully this information is helpful. Let me know if you have any additional questions or concerns.
Regards,
Neil S.
Applications Engineer
National Instruments

Is it possible to have too many keyframes in one project in Premiere?

Hi all,
I'm using Premiere 6 on a Windows 7 ULT machine.
Is it possible to have too many keyframes in one project in Premiere?
I'm getting app crashes when I try to re-open a certain project in Premiere 6 and it seems that if that file has over 93 keyframes, then it will not re-open. But I can re-open that exact same project file with 93 keyframes in it, no problem.
But if I go any further and create any more keyframes than 93 in a new re-saved version of the exact same file, then that file will not re-open and I get an app crash... you can see screenshots of the two Windows app crash info panels below that I'm getting from three different bad Premiere project files that I've created so far.
I've tested and tested what is going on here and this seems to be what is causing the bad files. I've re-created the scenario and re-created files with over 93 keyframes from the same base project file that will still open... as soon as I get more than 93 keyframes in this file, then that newly saved file will not re-open after I close and try to re-open it.
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Bill,
Even though I figured out a work around, I was still interested to know if these file opening crashes are related to Virtual Memory.
So on the topic of Virtual Memory... a few months ago I was troubleshooting a different problem in Premeire and I found this information...
"To improve performance in Premiere Pro, adjust the size of the paging file to a maximum of twice the amount of installed RAM."
Previous to that time three months ago or so, I had my Virtual Memory settings at the default automatic setting, but I tried setting my VM to twice the amount of installed RAM, and I've had it set that way ever since, just to make sure I'm optimizing the VM performance for Premiere and other apps.
But that isn't making any difference in this case. Today I also found information in a search that says to troubleshoot StackHash crashes, one should turn off "DEP" in the system settings for the application with the crash problem... according to the paragraph below, from the second post down by Chris on this tdistler.com page... http://tdistler.com/2009/04/10/stackhash-and-application-crashes-on-windows
Even though this was written in 2009 with Windows Vista in mind, many things for Vista work in Windows 7... it says,
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Method A:
1. Open your Start menu and click Control Panel
2. Browse to “System Maintenance” then “System”
3. In the left panel, select “Advanced System Settings” from the available links
4. You should now see the System Properties Window, which will have three sections. The top section is labeled “Performance” and has a “Settings” button. Click this button.
5. Select the “Data Execution Prevention” tab.
6. Select the option which reads “Turn on DEP for all programs and services except those I select”
7. Use the “Browse” button to locate the executable file for the application you were trying to start when you received the StackHash error, and click Open to add it to your exceptions list.
8. Click Apply or OK to commit your changes."
But I tried this and none of the three problem files that I encountered would open... I still got the StackHash_e98d or PREMINFO.dll crash errors.
So anyway, I'm a ways past that in my project now, just continuing with more keyframes over the number of 78 in separate but identical still image clips... that allows me to successfully work with this project with as many keyframes as I need.
Thanks again,
digi

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How many tasks in one project ?

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