Execution Speed of my page

Hi everybody,
I converted an existing report into an FM and used that FM in my BSP page to display the output in browser.
But the execution speed of BSP page is almost half as compared to the execution of report. I am not sure why this has happened.
Is the layout reponssible for this low speed?
But its excatly the same layout that report displayed.
Please tell me where should i do the changes to increase execution speed .
Thanks

I suggest you to execute SE30 transaction (performance measurements) and including your BSP. You can do this also from SICF, I think that in the menu you hace a Runtime Analysis option or similar (sorry I by now I cannot acces to my SAP BW). Then, check the report, and discover where the most of the time is spent.
I had a similar problem. I had a BSP which execute many times a FM for generate a data table. I put AJAX to my BSP to improve performance and concurrency.

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If you want to read more than one AI at the same time, you should use a trigger. You would need to set up the AI Trigger to an external source. Then you would have to use a function generator or digital out to create a clock. The clock would be wired to the AI external trigger. When the clock goes high (or low depending on configuration), both AIs would read. That is the method I use when needing to sync multiple AI inputs.
- tbob
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How can I stop the execution on a JSP page and start it again

Hi
I am making a program that simulates how to manage transactions when accessing a database by using locks. I have run into a problem and I hope someone has the time to help me.
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Why is the difference in execution speed of the function "SetCtrlVal" between constant and changing values so small ?

In my large application (1 MB exe-file) I am continuously updating a lot of numeric controls with new values. Most of them do not really change their value. Within my search of improving the performance of my application I noticed, that there is only a small difference of the execution speed between a call of "SetCtrlValue" with constant values and calls with changing values. It runs much faster (25 times on my PC), if I get the actual control value with "GetCtrlVal", compare it with my new value an do a call to "SetCtrlVal" only if the current value and the new value are different.
My questions to CVI-developers is:
Isn't it possib
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My question to all CVI-users is:
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What takes the extra time is the redraw of the control. When you call SetCtrlVal we ALWAYS redraw the control. We wouldn't want to build in functionality to check if the value was the same because that would add additional time to the SetCtrlVal in every case. If you want to do it outside of the loop you can as you have done above. You have a few options. First, keep a previous value variable for the controls that you can use to determine whether to set the control value. I.E.
int oldVal = 0;
int newVal = 0;
if(newVal!=oldVal) {
SetCtrlVal(..., newVal);
oldVal = newVal;
Also, if you set the value of a control through SetCtrlAttribute instead, there is no built in redraw of the control (which is what takes all the time). Using SetCtrlAttribute
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Best Regards,
Chris Matthews
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Execution speed improvements of FGV over locals

This my first post. I am new to LabVIEW and am currently writing my first significant application. I am actually modifying an existing application, but am adding additional functionality.
I have read this VI Execution Speed article but still have questions http://zone.ni.com/reference/en-XX/help/371361H-01/lvconcepts/vi_execution_speed/
As an example, I am populating an xy plot with several sets of data, such as saved data points and a curve fit. I am currently using a case structure to decide when to write various elements. As an example, I only write the curve fit one time and it remains static as other pieces of data are added to the graph. In an attempt to make things faster I did not want to redo and redraw the fit each time. I am using locals within the case to populate the graph. In the default case nothing if written to these locals (and I assume the graph is not redrawn)?
I now realize that instead using a case in which nothing is written, I could use a feedback node (to write the previous case). The in addition, in place of using a local, I could use a Functional Global Variable.
Would it be better to have several cases which write locals to populate the plot and one case which writes nothing OR Have the several cases write to a FGV and then a default case which writes the last data to the FGV via a feedback node?
The first seems like less load as nothing is written in the default case, but the other cases do write to a local which has a front panel object that I don't need or want.
Iis there any benefit to hiding unused front panel objects?
Is there a way to create a local without front panel object?
Finally, with a tabbed UI, are objects on the non active tabs being redrawn and slowing the process?

Good questions!
Starting from the bottom:
Iis there any benefit to hiding unused front panel objects?
Is there a way to create a local without front panel object?
No and No. Local variables are generally a poor way to store and move data. For the reasons you cited (FP object you do not want or need, hidden FP objects) and that they force a copy of the data and may cause a thread switch to the UI thread.
Finally, with a tabbed UI, are objects on the non active tabs being redrawn and slowing the process?
It depends. Newer versions of LV are generally smart enough that non-visible indicators are not redrawn. This may not have been true in older versions, although I do not know when the changes were made.
You certainly do not need to redo the fit if the data has not changed. I think the entire graph gets redrawn when any new data is written.
Search for Ben's extremely informative Nugget on Action Engines (AE). An Action Engine is a FGV with added capabilities. It may be a very good option for what you are trying to do. It could store all the data sets, update the graphs, and make the data available where it may be needed without extra copies. With the AE you could easily acquire and store data at one rate and update the graphs at a (slower) rate appropriate to the users eyes and brains. Updating graphs more than ~10 times per second is a waste of resources because the user cannot respond any faster than that. Also you could write a subset or reduced data set to the graph if the amount of data is larger than the number of pixels in the plot.
Lynn

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null

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Oracle Support Analyst (Ravi):
In the current JServer release, Java code you load to the server is
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JSP Page stops execution before the whole page is loaded

Software
Tomcat 5.5.2
JDK 1.5
Problem
I have a JSP Page
The problem is that it never gets finished off completely
I mean the page is always half loaded I mean it stops execution of the JSP Page in between and it shows no exception in the console Window
The page is not completely loaded
I don't know what is the reason and so can't understand the reason behind that
Thanks in advance
CSJakharia

Though Still I am confused why is this Page Buffer creating a sort of Exception.
I mean it is just a limit that if page reaches to that limit it should send the data
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Basically whether or not you get an error screen depends upon when the error is generated. If the error happens before the buffer fills up, then it can cancel the output, and show the error page.
If the buffer has already been filled up/flushed it can't cancel the output at this point. So it just stops sending.
That explains why
1 - page output cuts off halfway through
2 - if you make a bigger buffer, it can display the exception page - because the error happens before the bigger buffer fills up.
Regardless of whether the buffer was flushed or not, an error message would always be written to the Tomcat logs - check those for any problems.
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Execution Speed help

Hi there!
I hope someone can help me about my (probably noobish) question:
I have 2 Oracle environments, both not maintained by me and if I execute the following querry:
select * from DATA_TBL where rownum < 11;
It takes about 8 seconds on the one and less than 1 second on the other environment.
As there is everything selected via '*' and the where clause does not include data colums it can't be about indexes or analysed information or?
On both environments I also get the same explain_plan (only thing I have the rights to do):
PLAN_TABLE_OUTPUT
| Id | Operation | Name | Rows | Bytes | Cost |
| 0 | SELECT STATEMENT | | | | |
|* 1 | COUNT STOPKEY | | | | |
| 2 | TABLE ACCESS FULL | DATA_TBL | | | |
Predicate Information (identified by operation id):
1 - filter(ROWNUM<11)
Note: rule based optimization
15 rows selected.
I would be happy if someone could tell me about possible reasons for the difference in execution speed, or what to tell the DBA's..
Thanks in advance!
Jan

>
select * from DATA_TBL where rownum < 11;
It takes about 8 seconds on the one and less than 1 second on the other environment.
>
SQL> create table t1 as select 'AAAAAAAAAAAAA' as word from dual connect by level<=1e7;
Table created.
SQL> create table t2 as select 'AAAAAAAAAAAAA' as word from dual connect by level<=1e7;
Table created.
SQL> delete from t1 where rownum<5000000;
SQL> commit;
Commit complete.
SQL> set timing on
SQL> select * from t1 where rownum<10;
WORD
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
9 rows selected.
Elapsed: 00:00:02.44
SQL> select * from t2 where rownum<10;
WORD
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAA
9 rows selected.
Elapsed: 00:00:00.48Kind regards
Uwe
http://uhesse.wordpress.com

Execution speed onboard programs

Hi all
I am tying store the value of analog input channels of PCI-7352 on buffer, from onboard program.
The program run fine, but I don´t know how measure the total acquisition time in the program.
In an example in LabView ( adc-gpbuffer.vi ), use 'flex_load_delay' function to establish an interval in
the acquisition. But the real interval between readings not is calculated.
Another question, How I can know the execution speed of onboard program ?. The documentation does not
show information.
Thank´s
Javier
Attachments:
adc-gpbuffer.vi ‏165 KB

Javier,
there is no easy way to measure the execution timing of onboard programs. One thing that you could do is to toggle a digital line in your onboard program and measure the timing with an oscilloscope.
Please be aware that the timing of onboard programs doesn't work deterministicallly as onboard programs don't run with time critical priority on the board's CPU so you will probably see a fair amount of jitter.
The main purpose of the analog inputs on the 7352 is analog feedback. You can use them for single point measurements, too but if you need to acquire data with an accurate timing you better should use an additional M-Series board like the PCI-6220 which provide a much better measurement and timing accuracy and as true measurement devices they provide a whole set of additional useful features.
Best regards,
Jochen Klier
National Instruments Germany

EXECUTION SPEED OF FINISHED PROGRAM

Thanks Guys, You comments are really encouraging.
I agree Java is great!
My question really is put better this way:
The Execution speed of finished Java programs is slow and often does require much memory? Why is this and what are the solutions?
Thanks again

The Execution speed of finished Java programs is slow and often does require much memory? Why is
this and what are the solutions?Well, the solution is simple then: leave those Java programs unfinished; classic composers did the
same and they got famous for it ... Seriously though, your question is too vague; what is 'slow' and
what is 'much memory'? Before the application was 'finished' did you do any (unit) tests? It can't be
as if suddenly you go "my golly, it's slow and big now it's finished; lets complain". Care to elaborate?
kind regards,
Jos (fast, small and so soft for your hands ;-)

VI execution speed depending on mouse movement

Hi,
I have a large application that sometimes became very very slow. When It happens the only thing that I was able to notice is that moving mouse, execution speed of vi come back normal. I checked all the opened reference but I didn't find any not closed reference.
Any tip will be helpfull..
Golzio

can you give us any other information or post an example of the program. Does it use an event structure, data acquisition, are you performing file i/o? If you can give us an example it would be most helpful. Thanks
BJD1613
Lead Test Tools Development Engineer
Philips Respironics
Certified LV Architect / Instructor

VI execution speed in subpanel is slow

Hello,
I have the following problem with subpanels. I have a VI that should run inside of a subpanel. This VI contains an Image Display component (Vision). This Image Display is updated with a new image inside a while loop every 40 milliseconds. This is the one and only action inside of this loop. When I run this VI in a subpanel, the execution slows down to 200 ms for the Image Display update action (for the while loop). I measured the this with a Timervalue (ms) component. If my application runs the VI outside of the subpanel in an own window then the timig of 40 milliseconds works perfect. The only difference between the two situation is that the VI runs in or outside of a subpanel.
This is a great problem for me because my camera captures images with a framerate of 7,5 fps. So an Image Display update time of 200 ms is not acceptable for my application. Is this a known issue. Is there a workaround or some settings that I should tweak to improve execution speed of VIs in a subpanel. Or should i simply not use subpanels if execution speed matters - then it would be good to write this into the subpanel documentation. I carefully read the documentation an searched the dicussion forum but I could not find an answer.
Thank you very much for any help.

Hey Incredible,
could you tell me your labview version and please post your labview code.
Kind regards,
Elmar

Need help speeding up this page

One of our coders just inherited a CF page that generates a list of trail clearing equipment. The page basically builds a table with a row for each piece of equipment. There are columns for name, description, and a thumbnail photo of the piece in question. All the info is in a database on our server except the thumbnail photo. We're not allowed to host the photos on our server (some sort of legal reasons) so our database contains a link to each thumbnail, and those thumbnails all live on the equipment manufacturers' websites.
This is where the slowness happens. The following code is what was used to call the thumbnail up:
<cfoutput>
<cfhttp method="get" url="#url_to_image#" timeout="1"></cfhttp>
<cfif cfhttp.statuscode DOES NOT CONTAIN "OK">
(Then show an "image not found" thumbnail)
<cfelse>
(Then show the actual thumbnail)
</cfif>
</cfoutput>
The problem is that we have a few pages that have 30+ rows in the table, so even with a 1 second timeout, that page takes 30+ seconds to load because this <cfhttp> tag is executes for every single row.
Is there a better (or more current) way to do this? I believe the original app was built back when CF5 or 6 was in use, so maybe there are some new tools for this. Any suggestions would be appreciated.

An idea that just popped into my head -- is to remove that <chttp...> logic to it's own cfml file and let the browser make seperate requests for it.
You could create a file like this.
equipmentImage.cfm
<cfoutput>
<cfhttp method="get" url="#url_to_image#" timeout="1"></cfhttp>
<cfif cfhttp.statuscode DOES NOT CONTAIN "OK">
(Then deliver "image not found" thumbnail)
<cfelse>
(Then deliver the actual thumbnail)
</cfif>
</cfoutput>
And then in your main equipment table file you would replace all those <cfhttp....> blocks with a simple <img...> tag.
<img src="equipmentImage.cfm"....>
Then you would just have to modify the above <cfhttp...> block to deliver actual image binaries, not the normal html <img...> text that it probably does now. I don't have that piece of code on the top of my head, but I have seen plenty of examples posted all over the internets. With CF8 or CF9 you could use the <cfimage...> tag. With older versions, it takes a bit more work, but it is still possible.
This would not really speed up the page, but it would seem like it to most users, because the browser could render the main table and then fill in all the 30 pictures over the next several seconds. Just make sure your <img...> tags all have height and width parameters so that the browser does not have to wait for all the images to be requested to display the page.

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I use so many "System.out.println" statements in my java program.
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Everything that does something will make the application slower.
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