Decreased Battery Performance when using SL. Apple states I am alone..

This thread is mainly aimed at people that are using a mid 2009 unibody MacBook Pro 13" or upwards that came pre-installed with Leopard. Since upgrading to Snow leopard have you noticed a significant decrease in how long the battery lasts while using the machine in the same fashion?
Am I alone? I first reported this issue to the Dutch customer service team back in October 2009 and since then have fought it all the way to make Apple admit that there is a problem with a minority of customers. To this day according to executive customer relations, I am the only person who has reported this issue to them. I find this hard to believe as there is a mass of information/threads/blogs etc on the internet with many people complaining about the same issue.
The following is an email I sent to the [email protected] email as a last resort.
Dear Steve,
I am writing to you as a last resort hoping that my complaint will be dealt with professionally as I have actually given up all hope with the Apple customer service. I do not expect that you will personally read this letter but I just trust that someone will care and pass this to someone that will treat my complaint seriously as I really am losing all faith with Apple.
I purchased a brand new Macbook Pro 13" mid 2009 model at the end of June 2009. Around 3 weeks after I purchased the machine I received a message from Apple stating that I was eligible for a copy of Snow Leopard as it was compatible with my machine and because I had just purchased a new Mac. I upgraded the Mac to Snow Leopard without any issues. It wasn't until a few weeks later that I noticed a massive reduction in battery performance. When I ran the machine on Leopard I would easily get the advertised 7 hour battery life while doing basic web browsing with all the battery settings set to the Mac default recommended settings. On Snow Leopard I would not get anything more than 4 hours completing the same tasks.
I contacted Apple about this and was provided with the following reference number XXXXXXXXX I was basically told that I should monitor what I was doing etc and try using the screen on the lowest setting to see if this would improve the performance, it did not. I am a busy man and work in graphic design so unfortunately I put up with the battery issue until my Hard Drive decided to die in April. I contacted Apple again about this and was again provided with a reference number XXXXXXXXXX this time I was asked to do various steps to help fix the machine which did not work. Eventually I had the machine booked in for repair. When the machine was booked in for repair I also stated that I would like the battery issue addressed once and for all as I still only get around 4 hours charge. I was told this would be looked into. After 2 weeks of having no machine (and losing out on work) I received my Mac back with a new Hard drive installed as the old one was corrupted. I asked the Apple employee if my battery had been addressed and it had not. I refused to except my machine back as the battery issue was not resolved. After another 2 weeks of not having my Mac (more loss of work on my account) I received it back this time a new battery and motherboard had been installed.
I returned to my office and reinstalled Snow Leopard, my Adobe Master Collection and charged to 100% I then tested the machine on battery. Again I received no more than 4 hours using BELOW recommended Mac battery settings. I contacted Apple again by telephone (another 0900 number call at my expense) and was messed around left right and centre. The employee on the telephone did not know what to do so transferred me to one of the Mac level 2 agents. I have never been spoken to so rudely and was even told that the only way I could expect 7 hours battery life from a MacBook Pro 2009 model is to use it with the lid closed. Ridiculous hey? I was also even told by one of the previous customer service agents that I could try using the machine with the battery disconnected. Even more ridiculous considering it is a unibody model.
At this point I started doing research on the issue and found that I was far from alone with the battery issue. I have found numerous people suffering from the same issue. Below are a few links containing the same issue.
http://discussions.apple.com/thread.jspa?messageID=10337524&#10337524
http://discussions.apple.com/thread.jspa?messageID=11365892&#11365892
http://forums.cnet.com/5208-21565_102-0.html?threadID=357366
At this point I decided to try something different, something that was not recommended or mentioned by any Apple employee, sales or technical. I decided to reformat the HD and install Leopard back on the on the machine. I then completed a battery test and low and behold my 7 hours of battery life were fully back. I think this can safely say that the issue is clearly with the OSX and not the hardware.
I then contacted Apple customer service by phone (more 0900 numbers at my expense) I spoke to a senior Applecare advisor called XXXXX XXXXXXXX and explained my issue in full. I told xxxxxxx that I wanted this matter looking into and that I wanted a machine that would give me what is advertised using Snow Leopard, as know where on the Apple site or in the Snow Leopard documentation does it state ' Expect to lose 3 hours '
I provided xxxxxxxx with a system info file and he sent it the Apple engineering team. A week went by and I received an email from him with the report from engineering. Engineering basically blamed it ALL on 3rd party applications, they even blamed it on the weather widget stating that it is constantly updating and will drain power. My remote access software was also blamed which was not even running in the background.
1: The weather widget updates when you select it not constantly.
2: The weather widget is by DEFAULT installed on a machine so thus would be classed as an Apple product in my opinion.
That evening I decided to reformat my HD and reinstall Snow Leopard. This time I installed ONLY Apple software updates and nothing else. I then tested the battery again (getting very boring now) using the same settings as previous tests. This time I managed to have 4 hrs and 15 mins. Just 15 minutes more than what I had previously had. I then contacted xxxxxxx again and provided him with another system information file from the clean install. I explained that I had tested this with just the airport on and basic web browsing on various sites (my exact words) Another week went by and I received a call from xxxxxxx with his report from engineering. He said that Engineering wanted to know if I had tested this with basic web browsing or sat on Youtube or other flash based video streaming sites for 4 hours as this could reduce the battery life.
As you could imagine I was furious. I repeated myself to xxxxxxx about my tests and was told that he would go back to engineering. I received another call from xxxxxxx stating that engineering are looking into it. I asked how long it would take for an answer on this and we agreed on a 2 week time frame. It is now over 2 weeks and I have sent 2 emails to xxxxxx and still have not received a reply.
This issue has been going on since October 2009 when I first reported it. We are now in July 2010 and I am still suffering with this, as you can imaging this is unacceptable and not what one would expect from a company like Apple. My complaints summarized are below, I believe the obvious speak for themselves.
1: There is no disclaimer on the Apple site stating that Snow Leopard will decrease the performance of a battery on a machine that did not come preinstalled with Snow Leopard. Neither is this information provided on the installation PDF instructions that come with the Snow Leopard disc.
2: If there were such a disclaimer on the Apple site then why would I have my battery and motherboard replaced by the Apple repair team when there was clearly nothing wrong with them in the first place. Why was I never told this by any agent on the phone or in the Mac store? The answer seems clearly that this information is not available to the public or to Apple staff which is a big waste or my time as well as theirs.
3: I have missed out on work because of having my Mac in for repair for a total of 4 weeks. As mentioned above there was clearly no need to have had the battery or motherboard replaced.
4: I have spent money calling the 0900 numbers on numerous occasions simply getting passed around from Apple employee to Apple employee and still have no answer to my problem.
5: I have wasted so much of my own time clean erasing my hard drive including zero out of sectors and reinstalling operating systems, not to mention other software and Apple updates. All of this comes to many hours of total wasted time at my expense when I could have been working.
Where we stand now is that I am on the verge of taking legal proceedings with the Dutch Consumentenbond as this machine is not suitable to run with the Snow Leopard OSX when Apple advertise that it is.
I expect either a full refund of my MacBook Pro 13" mid 2009 or an exchange for a Macbook Pro 13" that comes with Snow Leopard preinstalled with the disc in the box. I also expect to be compensated for my loss of time, money I have spent on the phone to Apple and the loss of work while the machine was in for unnecessary repair.
I am really at the end of my patience with this issue and feel that I have been much more than fair with my reports, honesty and patience.
I trust to hear from somebody soon regarding this issue so that we can finally put it to a close once and for all in a professional manor.
Regards
I received a phone call within 14 hours of sending the email from executive customer relations. They came back with new information from engineering but did not think it was acceptable as engineering were now blaming my battery decrease on the assumption that my apartment might be too hot this causing the CPU to run at a higher temperature making the battery decrease quicker. We both agreed that it was an unacceptable answer.
The day after I received another call from them stating that engineering had now finished tests and came to the conclusion that when testing on Leopard and Snow Leopard on the MacBook Pro 2009 there was no difference in battery run time whats so ever. I found this hard to believe so asked exactly how the test was conducted. Was it conducted in the same fashion that I had spent the last 9 months talking about. ' Using below default energy saving settings with only airport on while completing basic web browsing '???
They confirmed this was not the case, engineering had basically turned the machines on, turned the screen right down to 1 bar and left them on screen saver over night. As you can imaging I was speechless (for a few seconds)
Apple seem consistent on NOT admitting that there is an issue with battery performance for a minority of customers. As is stands now engineering in Europe have now passed the case over to engineering in the US for further ' in-depth ' tests.
I know there are people out there that are suffering the same issues as myself and I welcome you to please contact me with your experiences. As the more of us that complain about this make it harder for Apple to deny this and brush it under the carpet.
Please feel free to reply to this thread or email me directly on [email protected]

Thomas A Reed wrote:
I mean this in the kindest way but please read the post
Please, nobody's going to waste their time reading all that! I don't know what you possibly could have said about this issue that took up so much space, but if you can't express it more concisely, it's probably not worth reading.
I have used SL on both a unibody MBP and an older MBP. On the older MBP, when I upgraded from Leopard to SL, I got a noticeable increase in battery life immediately. I have no such comparison on the unibody MBP, since it had SL installed to begin with, but I'll put it this way: I haven't come close to running out of power on it. I used it once for about 4 hours and still had more than a 1/3 charge. I could have easily used it for another couple hours, at least. And this was with a 17" MBP, which uses more power than your 13", and without much in the way of battery-saving going on. (Screen at full brightness, AirPort on and in use, Bluetooth on, etc.)
It's difficult to say that SL is the problem when it clearly isn't for everyone. What your problem is, I don't know, but maybe if you posted a more concise question you'd get some answers.
I think ..
This thread is mainly aimed at people that are using a mid 2009 unibody MacBook Pro 13" or upwards that came pre-installed with Leopard.....
at the beginning of the thread I made it pretty clear, if you are not affected by this then I'm happy for you, but then the thread is clearly not aimed at you. I can guarantee that I have tested this exactly the same way I did with Leopard and there is a significant decrease. I also know there are people out there that have gained battery life but there have also been many threads containing people who have lost battery life.

Similar Messages

  • Avoiding battery overheating when using MBP in the sun

    Are there any ways to keep a MBP battery cool when using it outside in the sun? Or should I just not worry about it?
    Today I was sat on my balcony enjoying the Mediterranean sun using my 2014 MBP when Coconut Battery popped up with a notification warning me that my battery was beginning to overheat and that damage could result. It was reporting a temperature of 35.5 C.
    So I opened up Macs Fan Control and switched from monitoring the CPU temperature to monitoring the battery temperature. However I get wildly different readings from the 3 battery sensors that MFC monitors compared with Coconut - sometimes the former shows more than the latter, other times the opposite. The hottest either of them registered was 38 C. I tried cooling it by setting MFC to max the fans out when the battery sensor read over 35 C but I'm not sure it made much difference - and having looked at MBP teardowns I know the battery is nowhere near the CPU fan.
    I'll be wanting to use my MBP outside more as we move into the heat of summer but I want to avoid battery damage. There's loads of stuff online about MBP CPUs getting hot - something which I think is a silly non-issue - but batteries are definitely more vulnerable to heat than silicon. Any tips anyone?

    Thanks, I'm familiar with Battery University. I read a lot of their stuff in some detail a while back when it was quite out of date - I see they've just updated that article so I need to reread it more thoroughly but the only metrics I can see about temperature on that particular page are about battery storage:
    "A battery dwelling above 30°C (86°F) is considered elevated temperature and for most Li-ion, a voltage above 4.10V/cell is deemed as high voltage. Exposing the battery to high temperature and dwelling in a full state-of-charge for an extended time can be more stressful than cycling."
    It doesn't seem to say anything about the a battery becoming damaged by occasionally heating itself to the mid-high 30s C for relatively short periods as a result of normal use in slightly warmer ambient temperatures.
    I've since had more Coconut battery warnings for similar temperatures while using the MBP indoors on my lap at room temperature, and others while the MBP was on a table charging and running some background tasks. As I write this sat in my bedroom the battery is reading 33 C - just 2 C away from the threshhold when the warnings start. This is all well within normal use and should be designed into the unit's normal operating temperatures so I'm not going to give much credence to Coconut Battery's warnings now I don't think.

  • TS3623 "An error occurred loading this content..try again later" is the message that I get when using my Apple TV remote.  I click on Breaking Bad; then I click on an episode and get the message which I just quoted.  Is this a Netflix problem?

    Why am I getting the following message when using my Apple TV remote on Netflix:  "An error occurred loading this content....try again later?

    Make sure DNS is set to ISPs (settings - general - network - DNS should be set to automatic). Trey rebooting ATV, and router. Make sure all are up to date.

  • I have coloured vertical lines about a quarter of the way from the left of the picture when using my apple tv 2. Anyone got any idea what is causing it. Have done a reset but still same. ATV2 is only a month old.

    I have coloured vertical lines about a quarter of the way from the left of the picture when using my apple tv 2. Anyone got any idea what is causing it. Have done a reset but still same. ATV2 is only a month old.

    Just to make sure, try a different set of cables. If the problem persists, have the unit replaced by Apple.

  • How do i get passed the billing step when using my apple id to download apps

    how do i get passed the billing step when using my apple id to download apps on my ipod touch

    DId you enter a valid payment method?

  • Poor performance when using kde desktop effect

    Hey,
    I'm having trouble when using kde effet (system settings -> desktop -> desktop effects).
    I have a dual core E5200 3 ghz, 2 GB memory pc8500 and an HD4850 using fglrx driver, but I got incredible bad performance when using desktop effect and watching video, I can barely watch a 800x600 video in full screen mode without having bad performance, X getting up to 40% cpu usage.
    Its really like my graphic card isnt handling the rendering stuff but 3D acceleration is working, I can play 3D game without problem so far (as long as the deskstop effect arent enabled cause the cpu have like a hard time handling both for recent game)
    So I guess its some trouble with 2D acceleration or something like that, I read that some people had such issue, but I didnt figure a way to fix it.
    Here is my xorg.conf, in case something is wrong with it :
    Section "ServerLayout"
    Identifier "X.org Configured"
    Screen 0 "aticonfig-Screen[0]-0" 0 0
    InputDevice "Mouse0" "CorePointer"
    InputDevice "Keyboard0" "CoreKeyboard"
    EndSection
    Section "Files"
    ModulePath "/usr/lib/xorg/modules"
    FontPath "/usr/share/fonts/misc"
    FontPath "/usr/share/fonts/100dpi:unscaled"
    FontPath "/usr/share/fonts/75dpi:unscaled"
    FontPath "/usr/share/fonts/TTF"
    FontPath "/usr/share/fonts/Type1"
    EndSection
    Section "Module"
    Load "dri2"
    Load "extmod"
    Load "dbe"
    Load "record"
    Load "glx"
    Load "dri"
    EndSection
    Section "InputDevice"
    Identifier "Keyboard0"
    Driver "kbd"
    EndSection
    Section "InputDevice"
    Identifier "Mouse0"
    Driver "mouse"
    Option "Protocol" "auto"
    Option "Device" "/dev/input/mice"
    Option "ZAxisMapping" "4 5 6 7"
    EndSection
    Section "Monitor"
    Identifier "Monitor0"
    VendorName "Monitor Vendor"
    ModelName "Monitor Model"
    EndSection
    Section "Monitor"
    Identifier "aticonfig-Monitor[0]-0"
    Option "VendorName" "ATI Proprietary Driver"
    Option "ModelName" "Generic Autodetecting Monitor"
    Option "DPMS" "true"
    EndSection
    Section "Device"
    ### Available Driver options are:-
    ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
    ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
    ### [arg]: arg optional
    #Option "ShadowFB" # [<bool>]
    #Option "DefaultRefresh" # [<bool>]
    #Option "ModeSetClearScreen" # [<bool>]
    Identifier "Card0"
    Driver "vesa"
    VendorName "ATI Technologies Inc"
    BoardName "RV770 [Radeon HD 4850]"
    BusID "PCI:8:0:0"
    EndSection
    Section "Device"
    Identifier "aticonfig-Device[0]-0"
    Driver "fglrx"
    BusID "PCI:8:0:0"
    EndSection
    Section "Screen"
    Identifier "Screen0"
    Device "Card0"
    Monitor "Monitor0"
    SubSection "Display"
    Viewport 0 0
    Depth 1
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 4
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 8
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 15
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 16
    EndSubSection
    SubSection "Display"
    Viewport 0 0
    Depth 24
    EndSubSection
    EndSection
    Section "Screen"
    Identifier "aticonfig-Screen[0]-0"
    Device "aticonfig-Device[0]-0"
    Monitor "aticonfig-Monitor[0]-0"
    DefaultDepth 24
    SubSection "Display"
    Viewport 0 0
    Depth 24
    EndSubSection
    EndSection
    Thank you for any help.

    Section "Device"
    ### Available Driver options are:-
    ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
    ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
    ### [arg]: arg optional
    #Option "ShadowFB" # [<bool>]
    #Option "DefaultRefresh" # [<bool>]
    #Option "ModeSetClearScreen" # [<bool>]
    Identifier "Card0"
    Driver "vesa"
    VendorName "ATI Technologies Inc"
    BoardName "RV770 [Radeon HD 4850]"
    BusID "PCI:8:0:0"
    EndSection
    and
    Section "Monitor"
    Identifier "Monitor0"
    VendorName "Monitor Vendor"
    ModelName "Monitor Model"
    EndSection
    I see no reason for those to be there.
    make a backup of your xorg.conf and remove / comment those lines.

  • Decreasing Battery Performance

    My MBP 17 Unibody battery was working fine for the first 1-9 cycles and I was getting about 7 to 7.5 hours out of it, but now from 10 cycles my battery life *****. I can only get up to a maximum of 4 hours after a full change and recalibration (used it till it shut down, waited 5 hours then charged it overnight for 7 hours straight without any interuptions). This is very frustrating and I'm trying to figure out why this is? I am on 'better battery performance' and I have no CPU intensive programs running and my display is on the lowest level setting.
    Any help or suggestions would be greatly appreciated...

    I get the same "problem", and it is frustrating as he**. My MBP is about 2 months old, I use it every day, and I probably charge it once a day. This gives me a cycle count at about 60 now (holidays included - where the computer has not worked a lot). My battery is already going down, I'll be lucky to get three hours of use. And there is another problem: Yesterday I was at 25% of battery (the icon was still black), I took a leak, and made a cup of tea - and when I returned to my computer the icon was at 10%, and when I tried to keep working it went to 6% and then came the "low battery warning".
    Apple gives you 300 cycles, and after that you are on your own - and have to buy a new battery... I actually work on my computer, I do not sit at the coffee house surfing the web. I am currently graduating, doing my masters in graphic design, and is using my computer a lot - by this rate the battery will be dead within six months.
    On apple Store, you can see someone having written a review of the MBP battery, stating that his battery went from 100-94% in a WEEK. That is just sad.

  • Battery Drops When Using Plugged In

    Hello,
    I charge my phone each night by connecting it to the computer and by the next day, as expected, the battery is at 100%
    However, if I use the phone without ever unplugging it, the phone will drop to 98-97% The battery icon indicates it's still plugged in with the plug symbol displayed inside the battery icon.
    I do have apps running in the background because I don't care to shut them all off before I go to bed each night.
    Any information on this, or others finding the same thing? Perhaps the 5.0.1 update will address this.

    That is a good thing to do. It will extend the life of your battery. Run the battery down to 40% and store it someplace cool. Every month or so be sure and use the battery and charge it and drain it to 40% before storing it again.
    I put the power option to performance when plugged into the external power pack. It is your own option as to which power option you use.
    Best regards,
    erico
    ****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
    2015 Microsoft MVP - Windows Experience Consumer

  • When using working apple ID keep getting message cookies are disabled but they are enabled for visited and also tried always

    I gave an ipod touch 4 to my youngest son for his birthday.
    Installed iTunes and updated firmware to 4.3.5 (8L1); all OK
    Created Apple ID and can logon to this using computer.
    When using the working apple ID on the iPod however, keep getting message cookies are disabled. This after it directs to review the new accoutn info.
    But cookies are enabled for 'visted'. Also tried 'always'
    Also tried hard reset.
    Spent a whole day trying to get an apple dev working; still can't use any app.
    Needless to say my son is very disappinted (and so am I) :-(
    Is there any way to get this working, or should I simply ask for a refund?

    Head to Settings -> Safari and tap Clear History, Clear Cookies, and Clear Cache and see if that does any good.
    What happens when you rewiew the account info?  Do you verify the provided information?
    B-rock

  • Is anyone able to explain really poor performance when using 'If Exists'?

    Hello all.  We've recently had a performance spike when using the 'if exists' construct, which is a construct that we use through much of our code.  The problem is, it appears illogical since if can be removed via a tiny modification that does
    not change the core code.
    I can demonstrate  
    This is the (simplified) format of the base original code.  It's purpose is to identify when a column value has changed comparing to a main table and a complex view
    select 1 from MainTable m
    inner join ComplexView v on m.col2 = v.col2
    where m.col3 <> v.col3
    This is doing a table scan, however the table only has 17000 rows while the view only has 7000 rows.  The sql executes in approximately 3 seconds.
    However if we add the 'If Exists' construct around the original query, like such:
    if exists (
    select 1 from MainTable m
    inner join ComplexView v on m.col2 = v.col2
    where m.col3 <> v.col3
    print 1
    The sql now takes over 2 minutes to run.  Note that the core sql is unchanged.  All I have done is wrap it with 'If Exists'
    I can't fathom why the if exists construct is taking so much longer, especially since the code code is unchanged, however more importantly I would like to understand why since we commonly use this type of syntax.
    Any advice would be greatly appreciated

    OK, that's interesting.  Adding the top 1 clause greatly affects the performance (in a bad way).
    The original query (as below) still runs in a few seconds.
    select 1 from MainTable m
    inner join ComplexView v on m.col2 = v.col2
    where m.col3 <> v.col3
    The 'Top 1' query (as below) takes almost 2 minutes however.  It's exactly the same query, but with 'top 1' added to it.
    select top 1 1 from MainTable m
    inner join ComplexView v on m.col2 = v.col2
    where m.col3 <> v.col3
    I suspect that the top 1 is performing a very similar operation to the exists, in that it is 'supposed' to exit as soon as it finds a single row that satisfies it's results.
    It's still not really any closer to making me understand what is causing the issue however.

  • E72- Battery Drain When using Exchange

    When using the Exchange application my battery appears to loose power quickly. At first I had Exchange to be active all the time. I changed it to connect now every four hours but even this setting appears to reduce battery time dramatically. Are there any settings that allow Exchange to connect, download email and disconnect? 
    How are users here handing this to allow use but maintain battery time?

    I do have a battery problem.  I had an e71.  I had push email configured for 5 email accounts.  Mail for exchange, yahoo mail and 3 hotmail accounts.  The battery never lasted less than 2 full days.  With the e72 I get about 4 hours.  It is so frustrating....I called Nokia customer support...their answer was to send it back to be fixed.  I purchased from Amazon, so I asked Amazon for a replacement, it arrived the next day (great service)... but the same battery life problem.  It is clearly software or firmware not a phone defect. 
    Any ideas.
    Thank you

  • Optimizing EtherCAT Performance when using Scan Engine

    Hello everyone,
    This week I have been researching and learning about the limitations of the LabVIEW's Scan Engine. Our system is an EtherCAT (cRIO 9074) with two slaves (NI 9144). We have four 9235s, two 9237s and two 9239 modules per chassis. That means we have a total of 144 channels. I have read that a conservative estimation for each scan is 10 usec. This means with our set up, assuming we only scan it would take 1.44 msec which would yield roughly a rate of 694 Hz. I know that when using a shared variable, the biggest bottle neck is transmitting the data. For instance, if you scan at 100 Hz, it'll be difficult to transmit that quickly, so it's best to send packets of scans (which you can see in my code).
    With all of that said, I'm having difficulties scanning any faster than 125 Hz without railing out my CPU. I can record at 125 Hz at 96% of the CPU usage but if I go down to 100 Hz, I'm at 80%. I noticed that the biggest factor of performance comes when I change my top loop's, the scan loop, period. Scanning every period is much much more demanding than every other. I have also adjusted the scan period on the EtherCAT's preferences and I have the same performance issues. I have also tried varying the transmission frequency(bottom loop), and this doesn't affect the performance at all.
    Basically, I have a few questions:
    1. What frequency can I reasonably expect to obtain from the EtherCAT system using the Scan Engine with 144 channels?
    2. What percent of the CPU should be used when running a program (just because it can do 100%, I know you shouldn't go for the max. Is 80% appropriate? Is 90% too high?)
    3.Could you look through my code and see if I have any huge issues? Does my transmission loop need to be a timed structure? I know that it's not as important to transmit as it is to scan, so if the queue doesn't get sent, it's not a big deal. This is my first time dealing with a real time system, so I wouldn't be surprised if that was the case.
    I have looked through almost every guide I could find on using the scan engine and programming the cRIO (that's how I learned the importance of synchronizing the timing to the scan engine and other useful facts) and haven't really found a definitive answer. I would appreciate any help on this subject.
    P.S. I attached my scan/transmit loop, the host program and the VI where I get all of the shared variables (I use the same one three times to prevent 144 shared variables from being on the screen at the same time).
    Thanks,
    Seth
    Attachments:
    target - multi rate - variables - fileIO.vi ‏61 KB
    Get Strain Values.vi ‏24 KB
    Chasis 1 (Master).vi ‏85 KB

    Hi,
    It looks like you are using a 9074 chassis and two 9144 chassis, all three full with Modules and you are trying to read all the IO channels in one scan?
    First of all, if you set your scan engine speed for the controller (9074), then you have to synchronize your Timed Loop to the Scan Engine and not to use a different timebase as you do in your scan VI.
    Second the best performance can be achieved with I/O variables, not shared variables and you should make sure to  not allocate memory in your timed Loop.  memory will be allocated if an input of a variable is not connected, like the error cluster for example or if you create Arrays from scratch as you do in your scan VI.
    If you resolve all these Issues you can time the code inside your Loop to see how long it really takes and adjust your scan time accordingly.  The 9074 does not have that much power so you should not expect us timing. 500 Hz is probably a good estimate for the max. Performance for 144 channels and depending on how much time the additional microstrain calculation takes.
    The ECAT driver brings examples which show how to program these kinds of Apps. Another way of avoiding the variables would be the programmatic approach using the variable API.
    DirkW

  • Poor Performance when using Question Pooling

    I'm wondering if anyone else out there is experiencing
    Captivate running very slow when using question pooling. We have
    about 195 questions with some using screenshots in jpeg format.
    By viewing the Windows Task Manager, CP is using anywhere
    between 130 to 160 K worth of memory. What is going on here? It's
    hammering the system pretty hard. It takes a large effort just to
    reposition the screenshot or even move a distractor.
    I'm running this on a 3.20GHz machine with 3GB of RAM.
    Any Captivate Gurus out there care to tackle this one?
    Help.

    MtnBiker1966,
    I have noticed the same problem. I only have 60 slides with
    43 questions and the Question Pool appears to be a big drain on
    performance. Changing the buttons from Continue to Go to next slide
    helped a little, but performance still drags compared to not using
    a question pool. I even tried reducing the number of question
    pools, but that did not affect the performance any. The search
    continues.
    Darin

  • Decreased battery life when Wi-Fi is OFF

    Hey everyone...
    I recently noticed that my MacBook Air late 2011 model running OS X 10.8.2 had a problem with the battery life when not connected to Wi-Fi or Wi-Fi was OFF. I noticed this recently when I was abroad and the hotel I was at had problems with it's internet connection, I booted up my MBA at 70% charge to finish this article I had to write and after 45 minutes or so my MacBook notifies me of low battery power. This never happens when I am connected to the internet.
    Other than that, after upgrading to Mountain Lion I started having slow boot up and shutdown times on my MBA
    Is there a problem with my configuration or hardware maybe or is this normal? (Both battery and slow shutdown and boot up times)

    Not really a solution for my problem - wicd deamon starts automatic at boot, and I don't wan change this.

  • Quality decreases in iPad when use the button tool

    I have a vector image (EPS file) and there is a close button on the right top corner. when i click on the close button it will be hide. For this I have used Multi State Object and Button Tools in indesign but when I look on the iPad everything works perfectly the quality of images are decreasing, it is converting to the raster images. Do you have any idea for this? Please suggest.
    Vikas

    Thanks both.
    Actually my concern is not button. Simple I am working on indesign, there is a text box with red background and some text (i.e. Vikas) in the blue color. I have created MSO and release all states to the first state, deleted everything in the 2nd state (i.e. 2nd state is blank). after that created a rectangle frame tool using "F" and converted it to button and add the action "Go to State" with keep the state as "State 2".
    Uploaded the indesign file to the folio. Downloaded, and every thing is working fine here (i.e. when we click on it the frame is hiding, nothing is there) but if we zoom in, the text "Vikas" is showing as blurry. which was typeset in the indesign file.
    Please suggest

Maybe you are looking for

  • Itunes won't open due to audio configuration?

    I just got a new Ipod and upgraded from a 30 gig to an 80 gig. The new one would only work on itunes 7.4 or better- so I downloaded it. Now Itunes won't open at all! It says: Itunes cannot run because it has detected a problem with your audio configu

  • XML encoding UTF-8 and accents

    hello everybody ! a little problem with my xml file, =========== <?xml version="1.0" encoding="UTF-8"?> <videoData> <video1        thumbtitle = "Soirs de fêtes - défilé de mode"             buffTime = "2"        header = "my description"        >flv/

  • Web Start Console :NoClassDefFoundError: javax/jms/JMSException

    HI all, am using JBoss server, J2SE1.4 ,windows XP This my JNLP file : <?xml version="1.0" encoding="UTF-8"?> <jnlp codebase="http://172.25.186.50:8080/JMSClient" href="JmsClient.jnlp"> <information> <title>My JMS Consumer</title> <vendor> System</ve

  • I really need to know

    how many songs or gb's can the i tunes hold. And how do u set the ipod updater for manualy.

  • Does System.out.println() has a limit ?

    I have this little program that permuates strings public class PermutationGenerator      private void perm(String s, String prefix)           int length = s.length();           if (length== 0)           System.out.println(prefix);           else