Measuring execution time

Hi, I had written a program a while back which was
simply loading in an xml file, parsing out a few
tags, and then writing back to the same file. I
thought of a way the parsing could be made more
efficient, and it certainly seems to be running faster,
however I am looking for suggestions on how I could
prove this?
Basically I am looking for a tool that could monitor
the length of time taken for the program to finish, so
I could do this using both versions of the program using
a set data set and compare the results.
Thanks in advance for any ideas/suggestions :)

It's fun putting subject lines in the search box
http://search.java.sun.com/search/java/index.jsp?and=ex
cution+time&phr=&qt=�=&field=title&since=&nh=10&col=
avaforums&rf=0&Search.x=19&Search.y=7Why limit yourself to 19 results, though? Search all the forums for "execution time" and you get 55,061 results. "Performance testing" yields 36,651 hits. I guess there's an outside chance one of those threads might be helpful, eh?

Similar Messages

Measure execution time with PowerShell

What would be the best way to accomplish following:
1. Get start time and write it to variable
2. Do something
3. Get end time and measure how long it taked from start to end and store the result in variable
I would need the result be in format like this hours:minutes:seconds and to support 24 hour clock so if the execution starts e.g 11:30 and ends 14:30 it shows correct time.

PowerShell already comes with a CmdLet that allows you to measure the time a script block takes to execute, that sounds like what you are after.
See these for more details on Measure-Command:
https://technet.microsoft.com/en-us/library/hh849910.aspx?f=255&MSPPError=-2147217396
https://technet.microsoft.com/en-us/library/ee176899.aspx

Tool for measuring execution time?

Hi,
i'm trying to measure the time of some determined methods in my app.
I've tried System.currentMillis(), but i don't get the accuracy i need (System.nanoTime() - from 1.5.0 sdk won't help me neihter).
Does anyone know a simple java tool that i can use to do this ???
I thought about optimized (borland), but i just don't have it :-( also i don't know if it ease to use (and i need this measuring as soon as possible).
Thanks for any sugestion,
ltcmelo

<<In Windows at least the resolution of System.currentTimeMillis() seems to be 10ms.
If the operation that takes 9 ms is called a thousand times, and the one that takes 5 ms is called 20
million times, and the one that takes 1 �s is called 200 million times, all will be fast to measure,
all will come in at zero ms by currentTimeMillis(). It would be useful to know the respective execution times of each method.>>
This is not correct. Windows does have 10 ms. granularity, however if you average many measurements this limitation disappears.
For example let's say that a particular method takes 5 ms. on average and we take 10 measurements. You claim that the 10 measurements will all be 0, whereas the actual measurements will either be 0 or 10 depending on how close the clock was to ticking when currentTimeMillis() was called. For example the 10 measurements might look like 0, 0, 10, 0, 10, 0, 0, 10, 10, 0. If you take the average of these numbers you get quite good accuracy (i.e. 50/10=5 ms. the actual time we said the method took). In principle the average should even get you sub-ms. accuracy.
Try it with jamon (http://www.jamonapi.com). JAMon calculates averages and so gets around the windows limitation. If you are coding a web app then jamon has a report page that displays all the results (hits, average time, totals time, min time, max time, ...). If not then you can get the raw data and display it as you like.
One question for the original poster. Why do you think you need sub-millisecond timings? If you are coding a business app IO tends to be the bottleneck and much greater than sub-millisecond.
Steve - http://www.jamonapi.com - a fast, free monitoring tool that is suitable for production applications.

Measure procedure execution time..

Hi,
Is there any possibility to measure how long each of a procedure in database take?? Is that possible for Oracle's V$ views or by performance report like AWR? On the other hand, is that possible to measure execution time for SQL statements, but without using "set timing on".
Best,
tutus

This is just an add-on to Satish's reply. You may want to chck this link to see how Profiler works,
http://www.oracle-base.com/articles/9i/DBMS_PROFILER.php
HTH
Aman....

Ideal execution time for any program

Hi,
Is there any method to determine the ideal execution time for a program ?
Or else how to determine that ?
I just wanted the max. time that a program can take so that the performance would not be hampered.
Thanks,
Binay.

did you ask for the 'ideal execution time' or 'how to measure execution times'?
The second question was answered in one of your other questions.
Optimization:
Do SQL Trace, go to Summary by SQL statement, check 10 Top contributions (time = duration).
Try to optimize them, note minimal time per record, if larger than 10.000 microsecodns, then you should index usage.
Do SE30, go to hit list, sort by net time, again address 10 Top contributions, try to optimize, check the coding.
Do optimization and trace again, check again 10 Top contributions ....
Siegfried

How to measure fpga execution time

Howdy--
I'm hacking through my first FPGA project without yet having the hardware on hand, and I find I could answer a lot of my own questions if I could predict what the execution time (ticks, mSec, whatever) of bits of my code will be. Running FPGA VIs on the Dev Computer with built in tick counters does not seem to be the proper way to go. Is it possible to know the execution time of FPGA code before compiling and running it on the target?
If it matters to anyone, my context for the question is a situation where a 10 uSec loop is imposed by the sample time of my hardware (cRIO 9076, with a couple of 100 ks/S I/O cards), and I'm trying to figure out how much signal processing I can afford between samples.
Thanks everyone, and have a great day.
Solved!
Go to Solution.

bcro,
You can look into cycle accurate simulation, which would give you a better understanding of how your code will work. More information can be found here: http://zone.ni.com/devzone/cda/tut/p/id/12917
As a rough measure, you can estimate that simple functions will take one tick to execute. However, there is not list of what is and is not a simple function.
You could also try placing code inside a single cycle timed loop (SCTL), which would then guarantee that all of the code in the loop will execute in 1 tick. However, if you are doing a lot of operations or trying to acquire an analog input, this will fail compilation.
Drew T.
NIC AE Specialist

Measure plsql execution time

Hello dear teachers,
i would be gratful for advice.
I have materialized view that is refreshed with the dbms_mview procedure and it's scheduled through dbms_job.
How could i measure that refresh execution time so i can for example query one table and have in there when this job(refreshing) started , and when did it finish ?
I could do set timing on in sqlplus , but is there somthing like that in plsql and than insert that time in some table ?
i am on 9.2.0.7.

set serverout on
declare
start_time number;
elapsed number;
begin
select to_char(sysdate,'sssss') into start_time from dual;
-- put here your code
select to_char(sysdate,'sssss')-start_time into elapsed from dual;
dbms_output.put_line ('Elapsed='||elapsed);
end;
/You can use systimestamp to get a more precise result.
Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com]

Measure the time of execution

Hi,
Is it possible to integrate one function similar Profile
(Tools>Advanced>Profile) in a VI to make statistics of execution times?
Thanks

Hi Xavier,
Ale914 was spot on with his reply, it really is as simple as that. To give you more of a visual aid if needed it would look like what you see below:
Regards
John McLaughlin
Insides Sales Engineer Team Leader
National Instruments UK & Ireland

How to get the execution time of a Discoverer Report from qpp_stats table

Hello
by reading some threads on this forum I became aware of the information stored in eul5_qpp_stats table. I would like to know if I can use this table to determine the execution time of a worksheet. In particular it looks like the field qs_act_elap_time stores the actual elapsed time of each execution of specific worksheet: am I correct? If so, how is this value computed? What's the unit of measure? I assume it's seconds, but then I've seen that sometimes I get numbers with decimals.
For example I ran a worksheet and it took more than an hour to run, and the value I get in the qs_act_elap_time column is 2218.313.
Assuming the unit of measure was seconds than it would mean approx 37 mins. Is that the actual execution time of the query on the database? I guess the actual execution time on my Discoverer client was longer since some calculations were performed at the client level and not on the database.
I would really appreciate if you could shed some light on this topic.
Thanks and regards
Giovanni

Thanks a lot Rod for your prompt reply.
I agree with you about the accuracy of the data. Are you aware of any other way to track the execution times of Discoverer reports?
Thanks
Giovanni

Execution time of a simple vi too long

I'm working with LabVIEW 6.0.2 on a computer (AMD ~700MHz) under Windows 2000. The computer is connected to the instruments (eg Keithley 2400 Sourcemeter) via GPIB (NI PCI-GPIB Card). When trying to read the output of the K2400 with a very simple vi (sending the string READ? to the instrument with GPIBWrite (mode 2) and subsequently reading 100byte with GPIBRead (mode 2) from the instrument, the execution time mostly exceeds 1s (execution highlighting disabled). Sometimes, it can be much faster but this is very irreproducible. I played around with the GIPBRead and Write modes and with the number of bytes to be read from the device as well as with the hardware settings of the Keithley 2400 but nothing seemed to work. The API calls ca
ptured by NI Spy mainly (lines 8 - 160) consist of ThreadIberr() and ibwait(UD0, 0x0000).
As this problem is the main factor limiting our measurement speed, I would be grateful for any help.
Thanks a lot
Bettina Welter

Hello,
Thanks for contacting National Instruments. It seems like the 1 second delay that is occurring is due to the operation being called. ThreadIberr returns the value of iberr, while ibwait simply implements a wait. These two get called repeatedly while the GPIB device waits for the instrument (K2400, in your case) to finish its operation and respond back. It is quite possible that when you query the Keithley to send back 100 bytes of data, it has to gather them from its buffer (if its already been generated). And if there aren't 100 bytes of data in the buffer, the Keithley will keep the NRFD line asserted while it gathers 100 btyes of data. After the data has been gathered, the NRFD line is deasserted, at which point, ThreadIberr will detect the change in th
e ibsta status bit and read the 100 bytes.
So make sure that the 100 bytes of data that you are requesting don't take too long to be gathered, since this is where the main delay lies. Hope this information helps. Please let us know if you have further questions.
A Saha
Applications Engineering
National Instruments
Anu Saha
Academic Product Marketing Engineer
National Instruments

Execution time of a flat-sequence

Hello there -
Is there any way to get a measurement of how long each part of
the flat sequence takes to execute? Anything like matlab's "tic" and "toc"
commands in labview? I have been playing with it for a while now and
have yet to discover if Labview has this functionality. Anyone know of
anything like this?
I currently have a VI that controls the realtime acquisition of a CCD camera via Firewire and a USB spectrometer. The VI collects data from each of these devices (triggered by an external source at 10Hz), and dumps them into a Matlab script which does analysis on the CCD image and spectrum. The bulk of the VI sits inside a while loop, which continues to run until the user presses the stop button. Inside this main loop is a flat-sequence. The sequence goes: ACQUIRE DATA ---> PROCESSING DATA ----> MATLAB SCRIPT ----> PLOTTING GRAPHS -----> OUTPUT DATA TO FILE.
The problem here is that the VI runs at 5Hz, while we are triggering it at 10Hz. Originally, it was my thought thought that the matlab algorithm was to blame, but I used the matlab commands "tic" and "toc" to determine that the matlab algorithm runs in 15-20ms. I did this by putting a "tic" command at the top of the matlab algorithm and a "toc" command at the bottom. The problem, as I have now discovered is that the rest of the labview code takes ~180ms to execute. (This was discovered by putting the "tic" at the bottom of the program, and the "toc" at the top of the program, thereby measuring the execution time of everything except the matlab algorithm). Each time a trigger signal from the external source comes in, it starts the flat-sequence structure (which takes ~190ms), and then waits for another trigger signal, always missing every second signal. My eventual goal is to reduce the bloat, and get the algorithm down to less than 100ms, so that I can run the VI and acquire data at 10Hz rather than 5Hz. If anyone can offer some help with this, it would be much appreciated!
Eric
P.S. - I have attached a copy of the VI that I am working on, but unfortunately, it most likely will not run on your computer....the VI will not run unless it is connected to a triggered spectrometer and CCD camera....but I have attached it anyways incase anyone who can help might want to take a look.
Attachments:
RTSpider.vi ‏376 KB

can we divide the program into 2 parts and use background process for acquisition and front end process for analysis?
I mean, create 2 VIs from the present VI and then launch the acquisition program dynamically as a background process and fire events in Main VI from acquisition VI and process it. not sure how much it is going to reduce. lets give a try....
Anil Punnam
CLD
LV 2012, TestStand 4.2..........

Execution time continues to increase while vi is running

I started with a vi which reads data from a WII remote (wiimote). The code works. I want to convert the acceleration data to velocity and displacement by numerical integration. Accurate conversion requires a measure of execution time. The vi correctly returns 9-11 ms when it first starts, however the measured intervals continue to increase in lenght as the vi runs. The measured interval goes from 10 ms to 80 ms after about 1 hour. I used a tick counter to measure the loop execution time. Any suggestions?
Attachments:
Simple Event Callback Roll Pitch. timed eventvi.vi ‏19 KB

Can you do some profiling to see which subVI could be the problem?
If you look at the task manager, how is the momery use over time?
Your timing systems seems flawed, because the execution of the first tick cound is poorly defined with respect to the rest of the code.
Some typical things to look out for.
growing arrays in shift registers
constantly opening references without ever closing them.
LabVIEW Champion . Do more with less code and in less time .

Execution time of a query

Hi,
I am trying to find the execution time of a SQL query.
How to do it?
Regards.
Ashish

>I am trying to find the execution time of a SQL query.
How to do it?
Psuedo code:
time = SystemTime() -- get the current system time
RunSQL() -- run the SQL statement
print( SystemTime()-time ) -- displays the difference in time
Needless to say that this is utterly useless most of the time. The first time a query is run it may be subjected to a hard parse. The second time not. So the exact same SQL will show different execution times. This execution time measurement is useless as it does not tell you anything - except that there was a difference in time.
The first time a query runs it make do a lot of physical I/O to read the data from disk. The second time around, with the data in the db buffer cache, it makes use of logical I/O. There is a significant difference in the execution of the exact same SQL. Again, the measurement of execution is meaningless. It does not tell you anything. One number versus another number. Nothing meaningful to compare.
Fact. The very same SQL will have different execution times.
So what do you hope to gain from measuring it?

Execution time too low

I was trying to measure the execution time. The rate is 1KS/s per channel and the samples to read is 100 per channel in a for loop of 10. The time should be around 1000ms, but it's only 500-600ms. And when I changed the rate/numbers of samples, the execution time doesn't change..... how could this happen?
Solved!
Go to Solution.
Attachments:
trial 6.vi ‏19 KB

JudeLi wrote:
I've tried to drag the clear task out of the loop but every time I did it, it ended up in a broken wire saying that the soure is a 1-D array of DAQmx event and the type of sink is DAQmx event.....
You can right-click on the output tunnel and tell it to not auto index. But even better would be to use shift registers just in case you tell that FOR loop to run 0 times.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
trial 6.vi ‏13 KB

Oracle NoSQL YCSB - continuously increasing execution time

Greetings,
currently I am testing several nosql databases using YCSB. I am new to that type of databases, but I have already tested few of them. I am using VM with 2GB RAM and hosted on Win 7. Even though it is not recommended, since I am working in now capacity environment, I am using KVlite. But my problem is confusing and I can not find the reason. So, I have successfully loaded data and tested Oracle NoSQL using different workloads. However, with each execution, I get higher execution time. For example, if at 1st execution I get 20 seconds, if I shut database down and next day execute same workload again, I get 35 second execution time and so on.
Do you have any idea of what may be causing that? Like I said, I have been researching some nosql databases but I have never had that strange results.
Regards.

To add to Robert's comment, the NoSQL DB documentation on KVLite states the following:
     KVLite is a simplified version of Oracle NoSQL Database. It provides a single-node store
     that is not replicated. It runs in a single process without requiring any administrative interface.
     You configure, start, and stop KVLite using a command line interface.
     KVLite is intended for use by application developers who need to unit test their Oracle NoSQL
     Database application. It is not intended for production deployment, or for performance measurements.
Per the documentation, you can use KVLite to test out the API calls in your performance benchmarking application, but you should not use to it perform the actual performance testing. For performance testing, please install and use the Oracle NoSQL Database server.

Measuring execution time

Similar Messages

Maybe you are looking for