Why does MDS run wild in Mac OS X 10.6?
Solution 1
To see what mds and more importantly its child mdworker is actually doing - use fs_usage to log what files it is opening:
sudo fs_usage -w -f filesys mdworker
Though there is a lot of unintelligable stuff in there, it does tell you when it opens a file to begin reading from it. Copying a PDF into my filesystem shows mdworker opening the file then immediately after lots of activity...
p.s. if you want a little less detail, this will just list the open file points:
sudo fs_usage -w -f filesys mdworker | egrep "open"
Solution 2
In the rare case that you would like to disable spotlight, use the following command:
sudo mdutil -a -i off
To re-enable:
sudo mdutil -a -i on
Solution 3
Just wanted to note that Spotlight/MDS may not be the issue at all. Errors with Time Machine (particularly where Time Machine takes a long time to "index") can create a situation where Spotlight tries to continually index the same files.
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Comments
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user1151403 over 1 year
I've been having trouble with the MDS process running wild on my MacBook Pro 13". I've read on other support forums indicating that improperly formatted external drives can be an issue, but I have no drives connected. How can this problem be debugged and fixed?
If it helps, I do have a massive Mail archive. I have not turned off the indexing of this archive, because I haven't been able to find a correlation between the two, but I'm considering it.
(This might be normal right after doing an upgrade from 10.5 to 10.6, in which case the Spotlight search index needs to be rebuilt by
mds
. But in this case it's been a few weeks.)-
Admin about 10 yearsI did a 'sudo killall -9 mdworker' on my wife's macbook and that seems to have solved her disappearing memory problem.
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Admin about 8 yearsFor your information, this typical nightmare of
Spotlight
still happens on actualYosemite
versions. I can't tell forEl Capitan
yet.
-
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Nathan Bowers about 13 yearsThe Tentacle's answer worked for me. Specifically: My spotlight processes were hanging at 100% CPU and never completed indexing. With
fs_usage
I was able to see exactly which files hung upmdworker
. I deleted the offending folders (they likely had a symlink loop), restarted the Spotlight processes, and everything worked. -
Nathan Bowers about 13 yearsIMPORTANT: once you figure out which folders or files are causing Spotlight processes to hang, exclude them from Spotlight indexing via the Spotlight "Privacy" settings tab. Sometimes the problem files are auto generated by OSX.
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Jari Keinänen about 13 yearsIf it really is the
mds
process that runs wild, just replace themdworker
in the command withmds
. (This helped me to diagnose the issue when Spotlight suddenly decided to index my Bootcamp partition.) Thanks! -
highBandWidth almost 13 yearsThis shows the file names but not the folders. Specifically, it is using a lot of CPU while building certain applications in MacPorts. I have already excluded /opt and I think it is indexing /tmp, where some of the compiler files are being written. How do I find the complete path of these files it is indexing?
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Alan H. about 12 yearsIn my case, a series of backups/restores/OS reinstallations meant that Backblaze’s cache (/Library/Backblaze) was removed from Spotlight & Time Machine exclusion rules.
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Danny Staple almost 12 yearsHmm - since spotlight seems to be trying to be clever in the UI when disabling time machine backups (it notifies it will still be indexing parts of the drive) - I've resorted to command line stuff from here- mikesel.info/disable-spotlight - to try and stop it hitting it,
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dan about 8 yearsExcellent receipe to analyze this problem. ---- I would suggest to add the following prerequisite since this is an easy to fix and frequent cause of
mds
looping: check the filesystem withDisk Utility
.