CPU usage for Image acquiring by using Imaq1411

Hello,
Running the IMAQ program makes the CPU usage almost 100%. I tested it out with my own program and the example program you provided. So far I haven't have any clue about this.
I've tried to set the ROI as the help said (Left, Top, Right, Bottom), but failed. I had to set that in the order of Left, Bottom, Right and Top on my program.
With the Snap.vi, I set up the ROI and step x, y. The original image size is 640X480. But I just want to see the center part (160X120) of whole image depending on the Zoom (1:1, 1:2, 1:4). To do that, I programmtically set the ROI and Step (x, y) to be like the followings, which I think makes the same image size (160X120) but a different zoom.
(0, 480, 640,0) and (4, 4) for ZoomX1
(1:1)
(160, 360, 480, 120) and (2, 2) for ZoomX2 (1:2)
(240, 300, 400, 180) and (1, 1) for ZoomX4 (1:4)
Does it make sense?
Thanks, GraceSun"

Hello.
After looking into your question a little more carefully, it seems that you are essentially trying to zoom in on the center of your image. To do this, you should not need to use the Step X, Step Y inputs at all, you should simply have to setup the ROI descriptor to get the selected part of the image. If you would like all images to be the same size, despite the zoom, you should use the horizontal and vertical scaling parameters. See the following KnowledgeBase for more info on these parameters.
Again, I would like to reiterate that the correct order for the ROI should be Left, Top, Right, Bottom. That being said, however, 'If it aint broke, don't fix it
You are definitely on the right track to getting the zooming feature you want down.
Regards,
Colin C.
Applications Engineering
Colin Christofferson
Community Web Marketing
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Attachments:
target save.vi ‏328 KB

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Hi Team,
We have a very high cpu usage issue in the production.
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Jrockit version:
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
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[email protected]

Hi,
I'm having a similar problem, but haven't been able to resolve it yet. Troubleshooting is made even harder by the fact that this is only happening on our production server, and I've been unable to reproduce it in the lab.
I'll post whatever findings I have and hopefully we'll be able to find a solution with the help of BEA engineers.
In my case, I have a stand-alone Tomcat server that runs fine for about 1-2 days, and then the JVM suddenly starts using more CPU, and as a result, the server load shoots up (normal CPU utilization is ~5% but eventually goes up to ~95%; load goes from 0.1 to 4+).
What I have found so far is that this corresponds to increased GC activity.
Let me list my environment specs before I proceed, though:
CPU: Dual Xeon 3.06GHz
RAM: 2GB
OS: RHEL4.4 (2.6.9-42.0.2.ELsmp)
JVM build 1.5.0_03-b07 (BEA JRockit(R) (build dra-45238-20050523-2008-linux-ia32, R25.2.0-28))
Tomcat version 5.5.12
JAVA_OPTS="-Xms768m -Xmx768m -XXtlasize16k -XXlargeobjectlimit16k -Xverbose:memory,cpuinfo -Xverboselog:/var/log/tomcat5/jvm.log -Xverbosetimestamp"
Here are excerpts from my verbose log (I'm getting some HT warning, not sure if that's a problem):
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Detected SMP with 2 CPUs that support HT.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to determine if HT is enabled.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to read from /dev/cpu/0/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: Failed to read from /dev/cpu/0/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to read from /dev/cpu/1/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: Failed to read from /dev/cpu/1/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] HT is: supported by the CPU, not enabled by the OS, enabled in JRockit.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: HT enabled even though OS does not seem to support it.
[Fri Oct 20 15:54:55 2006][22855][memory ] GC strategy: System optimized over throughput (initial strategy singleparpar)
[Fri Oct 20 15:54:55 2006][22855][memory ] heap size: 786432K, maximal heap size: 786432K
[Fri Oct 20 16:07:30 2006][22855][memory ] Changing GC strategy to generational, parallel mark and parallel sweep
[Fri Oct 20 16:07:30 2006][22855][memory ] 791.642-791.874: GC 786432K->266892K (786432K), 232.000 ms
[Fri Oct 20 16:08:02 2006][22855][memory ] 824.122: nursery GC 291998K->274164K (786432K), 175.873 ms
[Fri Oct 20 16:09:51 2006][22855][memory ] 932.526: nursery GC 299321K->281775K (786432K), 110.879 ms
[Fri Oct 20 16:10:24 2006][22855][memory ] 965.844: nursery GC 308151K->292222K (786432K), 174.609 ms
[Fri Oct 20 16:11:54 2006][22855][memory ] 1056.368: nursery GC 314718K->300068K (786432K), 66.032 ms
[Sat Oct 21 23:21:09 2006][22855][memory ] 113210.427: nursery GC 734274K->676137K (786432K), 188.985 ms
[Sat Oct 21 23:30:41 2006][22855][memory ] 113783.140: nursery GC 766601K->708592K (786432K), 96.007 ms
[Sat Oct 21 23:36:15 2006][22855][memory ] 114116.332-114116.576: GC 756832K->86835K (786432K), 243.333 ms
[Sat Oct 21 23:48:20 2006][22855][memory ] 114841.653: nursery GC 182299K->122396K (786432K), 175.252 ms
[Sat Oct 21 23:48:52 2006][22855][memory ] 114873.851: nursery GC 195060K->130483K (786432K), 142.122 ms
[Sun Oct 22 00:01:31 2006][22855][memory ] 115632.706: nursery GC 224096K->166618K (786432K), 327.264 ms
[Sun Oct 22 00:16:37 2006][22855][memory ] 116539.368: nursery GC 246564K->186328K (786432K), 173.888 ms
[Sun Oct 22 00:26:21 2006][22855][memory ] 117122.577: nursery GC 279056K->221543K (786432K), 170.367 ms
[Sun Oct 22 00:26:21 2006][22855][memory ] 117123.041: nursery GC 290439K->225833K (786432K), 69.170 ms
[Sun Oct 22 00:29:10 2006][22855][memory ] 117291.795: nursery GC 298947K->238083K (786432K), 207.200 ms
[Sun Oct 22 00:39:05 2006][22855][memory ] 117886.478: nursery GC 326956K->263441K (786432K), 87.009 ms
[Sun Oct 22 00:55:22 2006][22855][memory ] 118863.947: nursery GC 357229K->298971K (786432K), 246.643 ms
[Sun Oct 22 01:08:17 2006][22855][memory ] 119638.750: nursery GC 381744K->322332K (786432K), 147.996 ms
[Sun Oct 22 01:11:22 2006][22855][memory ] 119824.249: nursery GC 398678K->336478K (786432K), 93.046 ms
[Sun Oct 22 01:21:35 2006][22855][memory ] 120436.740: nursery GC 409150K->345186K (786432K), 81.304 ms
[Sun Oct 22 01:21:38 2006][22855][memory ] 120439.582: nursery GC 409986K->345832K (786432K), 153.534 ms
[Sun Oct 22 01:21:42 2006][22855][memory ] 120443.544: nursery GC 410632K->346473K (786432K), 121.371 ms
[Sun Oct 22 01:21:44 2006][22855][memory ] 120445.508: nursery GC 411273K->347591K (786432K), 60.688 ms
[Sun Oct 22 01:21:44 2006][22855][memory ] 120445.623: nursery GC 412391K->347785K (786432K), 68.935 ms
[Sun Oct 22 01:21:45 2006][22855][memory ] 120446.576: nursery GC 412585K->348897K (786432K), 152.333 ms
[Sun Oct 22 01:21:45 2006][22855][memory ] 120446.783: nursery GC 413697K->349080K (786432K), 70.456 ms
[Sun Oct 22 01:34:16 2006][22855][memory ] 121197.612: nursery GC 437378K->383392K (786432K), 165.771 ms
[Sun Oct 22 01:37:37 2006][22855][memory ] 121398.496: nursery GC 469709K->409076K (786432K), 78.257 ms
[Sun Oct 22 01:37:37 2006][22855][memory ] 121398.730: nursery GC 502490K->437713K (786432K), 65.747 ms
[Sun Oct 22 01:44:03 2006][22855][memory ] 121785.259: nursery GC 536605K->478156K (786432K), 132.293 ms
[Sun Oct 22 01:44:04 2006][22855][memory ] 121785.603: nursery GC 568408K->503635K (786432K), 71.751 ms
[Sun Oct 22 01:50:39 2006][22855][memory ] 122180.985: nursery GC 591332K->530811K (786432K), 131.831 ms
[Sun Oct 22 02:13:52 2006][22855][memory ] 123573.719: nursery GC 655566K->595257K (786432K), 117.311 ms
[Sun Oct 22 02:36:04 2006][22855][memory ] 124905.507: nursery GC 688896K->632129K (786432K), 346.990 ms
[Sun Oct 22 02:50:24 2006][22855][memory ] 125765.715-125765.904: GC 786032K->143954K (786432K), 189.000 ms
[Sun Oct 22 02:50:26 2006][22855][memory ] 125767.535-125767.761: GC 723232K->70948K (786432K), 225.000 ms
vvvvv
[Sun Oct 22 02:50:27 2006][22855][memory ] 125768.751-125768.817: GC 712032K->71390K (786432K), 64.919 ms
[Sun Oct 22 02:50:28 2006][22855][memory ] 125769.516-125769.698: GC 711632K->61175K (786432K), 182.000 ms
[Sun Oct 22 02:50:29 2006][22855][memory ] 125770.753-125770.880: GC 709632K->81558K (786432K), 126.000 ms
[Sun Oct 22 02:50:30 2006][22855][memory ] 125771.699-125771.878: GC 708432K->61368K (786432K), 179.000 ms
So, I'm running with the default GC strategy which lets the GC pick the most suitable approach (single space or generational). It seems to switch to generational almost immediately and runs well - most GC runs are in the nursery, and only once in a while it goes through the older space.
Now, if you look at [Sun Oct 22 02:50:27 2006], that's when everything changes. GC starts running every second (later on it's running 3 times a second) doing huge sweeps. It never goes through the nursery again, although the strategy is still generational.
It's all downhill from this point on, and it's a matter of hours (maybe a day) before we restart the server.
I guess my only question is: What would cause such GC behavior?
I would appreciate your ideas/comments!
Thanks,
Tenyo

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forgot to mention: OS is solaris 9

CPU Usage High, Individual Apps Not using Total

Hi everyone,
I've got a 2007 white Macbook currently running the most up to date version of Snow Leopard and recently the fan has been on a lot more often than it usually is and when I check in Acitivity Monitor the CPU usage is extremely high. Normally it's around 2-4% tops but several times over the last few months it's been at 50-60% sustained usage for a long time (upwards of 20 minutes, then I just reboot it). Once or twice it waws higher than 100%. I checked Activity Monitor and killed the normal culprits like Shockwave and Flash, then anything with Microsoft in the name. I'm a big tabbed browser user so I closed off google Chrome. Right now, running Adium, iCal, Powerpoint (small file size, only 5 slides), and Word, 45% of the CPU is currently in use. I went through and systematically closed everything but the CPU usage is still around 45% after closing all active programs in the dock other than Finder and Activity Monitor. The strange part for me is that the amount of CPU usage is not the sum of the CPU usage of all the programs currently running. It's not even close (like 1% versus 45%)
Does anyone know what might be wrong? Rebooting it will usually fix this problem, but I'm worried I either have Malware, a Trojan that iAntivirus isn't detecting, and my computer is somehow being used without my knowledge or something is wrong with my Mac.
Thanks in advance for any help!
Specs are Macbook 3,1, Intel Core 2 Duo 2.2 GHz, 4GB ram

hrishy wrote:
Hi
Why so much time is being spent in CPU ?
Apologies the rich text editor is not working and i am unabel to format this code properly
Rows Operation
______0 NESTED LOOPS (cr=117469550 pr=444 pw=0 time=1670966102 us)
(snip)
______0                    NESTED LOOPS (cr=117469550 pr=444 pw=0 time=1670965844 us)
462,472                       NESTED LOOPS (cr=1389078 pr=196 pw=0 time=12429546 us)
(snip)
______0                       TABLE ACCESS FULL CON (cr=116080472 pr=248 pw=0 time=1889064945 us)
(snip)
The execution plan shows a nested loop join between a row source containing 462,472 rows and a full table scan of the table CON - that means the table CON was full table scanned 462,472 times, resulting in 116,080,472 consistent gets in 9 executions. The consistent gets are the cause of the high CPU usage. You might work through the links provided by Narendra to find the cause of the nested loop joins. Maybe this indicates a problem with the object statistics, or possibly it is caused by an unfortunate set of parameters that affected the optimizer's decisions.
Charles Hooper
Co-author of "Expert Oracle Practices: Oracle Database Administration from the Oak Table"
http://hoopercharles.wordpress.com/
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

High CPU usage for no reason

Recently, my MBP becomes hot and its battery life becomes shorter, so I checked the Activity Monitor. The CPU is reported as ~37% User and ~22% System when it's idle. But I am not running anything besides Activity Monitor and all processes show normal CPU usage in Activity Monitor.
I also heard the harddisk keeping reading/writing. The Disk Activity persistently reported 0 Reads in/sec and ~30 Writes out/sec when the computer is idle.
I have repaired permissions, and reset the PRAM, but nothing changed.
Any help would be appreciated!

Workaround and Solution!
In a nutshell: The long and short of it is that many websites today are very resource intensive. The workaround is to share the load among two to four different browsers. This workaround works every time. The browser-builders will have to make the final fixes.
I urge all of you to duplicate my results!
I've been troubleshooting this with Apple for well over 2 weeks and just discovered the root cause and workaround a couple of hours ago. Here's what I sent to Apple:
Subject:
Root Cause Identified for Case 20244XXXX!
Body:
Insufficient Stress Testing and No Load Shedding!
Hello Annette, Jim and Steve,
Please see the attached screenshots.
Engineering, especially test engineering, needs to look at this! When this is resolved Steve can go on stage and show another Safari feature that is superior to Camino, Chrome and Firefox, etc. (I was able to replicate part of this using several boxes at a local Apple Store about a week ago!)
Here’s the deal:
I was blaming Safari because I rarely use other browsers.
1. Open Activity Monitor to All Processes and order by %CPU descending.
2. Launch a browser and go to http://streamingradioguide.com/streaming-radio.php?format=1&radio-format=News/Ta lk&includeAM=on&includeFM=on&includeHD=&includeLPFM=
or http://radiotime.com/channel/c_57922/News.aspx, open a few streams and watch the %CPU skyrocket. (I often channel-flip between several streams.)
3. Document the results.
4. Repeat steps 2 and 3 for a second, third and fourth browser.
5. Repeat steps as needed on other test boxes. Repeat everything as needed.
6. Send the documentation of these tests to engineering.
7. Engineering: Replicate results and review all documentation.
8. Make Safari much more resource efficient than any other browser.
Steve can then demo this to the world and everyone will have another insanely great day!
Thanks for another great demo today Steve.
John
The long and short of it is that many websites today are very resource intensive. The workaround is to share the load among two to four different browsers. This workaround works every time. The browser-builders will have to make the final fixes.
Thanks,
John

CPU usage for Image acquiring by using Imaq1411

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