Mds and mdworker are constantly using 10%-40% of my CPU since partitioning.

2 days ago I partitioned approximately 80GB of my 500GB 7200rpm macbook pro drive to be used for Windows 7. There was 430GB of free space on my HDD at the time so I know that there was no overwrite issue. It has successfully been installed and runs very well. However, since I did this the mds and mdsworker processes on the Mac side are constantly using large amounts of my CPU and are bogging down my computer. I understand that these services help create the Spotlight database. Is anyone aware of this issue?

After two days I'd say it's time to start over. Go to the System Preferences application- you can get to it by clicking on the Apple in the upper right corner, System Preferences is about a third of the way down the menu. When it's open, select Spotlight from the list of preferences. Under "Search Results" in Spotlight you will see the order in which results will be displayed. If you want to change the order, now would be a good time.
Uncheck all the boxes, this will remove them from the consideration of Spotlight. Then re-check the ones you wish to be available in Spotlight, this will force them to be re-indexed. My arithmetic says your files should occupy not much more than 50 GB, this should not take long to index.
You could try just Applications, or just System Preferences first to see if it is able to complete the task. If it takes longer than a few minutes, there's likely something else going on, perhaps related to your partitioning.
Good luck! Joel.

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Ever since I upgraded to Lion on my Macbook Pro I am getting intermittant periods where the MDS and MDWORKER processes completely take over the CPU and all apparent activity for minutes at a time. It's now been a week, so I'm quite sure Spotlight is done indexing the drive. What are my options?

I'm having the same problem you are, and I'm exploring options.
First I noticed that Backblaze (backup service) was causing the problem, but I fixed that by including the /library/backblaze folder in Spotlight's privacy area. The complete lockup that was causing is now no longer a problem.
However, I'm noticing that most of the cycles are going to indexing my Time Machine backups, which Spotlight will not allow in the privacy area. It looks like it's indexing many of my old mailbox files from mail.app that are backed up on the Time Machine (Time Capsule) disk. I really don't see the logic to this. I've had the computer on and idling with full access to Time Machine for many days now and this is still going on, with MacBook Pro fans running at full gun and CPU not quite maxing out, but frolicking between 5% and 65% or so on a regular basis with no other apps present. Activity monitor doesn't show anything else hogging cycles -- it's all mds and mdworker.
Something isn't right with this. I hope that the next update from Apple will fix this, or someone on the intertubes will come up with a quick solution.
All the above is on a MacBook Pro (late 2008). I do note that I have a MacBook Air (late 2010) that backs up to the same Time Machine but does NOT have Backblaze installed. (I put everything important on the MacBook Pro.) This machine does not seem to have these problems. Both computers are running Lion and have much of the same software. Backups are doing fine on both machines.
My temporary solution is to turn OFF Time Machine on the MacBook Pro. This does seem to make things much better -- although even at 5% CPU use the fan runs somewhat higher revs than I was used to with Snow Leopard. I then run a manual Time Machine cycle just before I turn in for the night. When I'm back to using the machine again, I make sure the Time Capsule is not mounted. I'm backing up any working files continually to Backblaze still, as well as to Dropbox, so cutting the Time Machine frequency down to once or twice a day is not too bad for now. I do not want this to continue, however.
Also, I have done the following: Repaired disk permissions, reset the SMC and PRAM, and started the computer up in safe mode fully, and then restarted in regular mode.
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Moderator message - Please search before asking - post locked
Edited by: Rob Burbank on Sep 1, 2009 9:11 AM

Hi,
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Message was edited by: D.M.

D.M. wrote:
In Activity Monitor there is a Print Manager App taking over 99% of CPU resources and as a result, fans are on at full speed constantly, even if NOTHING is open. The user of this App is "_lp".
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I understand that "root" and "myname" should be the only users.
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Are the above signs that somebody/something got inside my machine? I have also discovered MacFUSE in my System Preferences and I know for sure that I did not installed that one.
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Mds and mdworker are constantly using 10%-40% of my CPU since partitioning.

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