Spotlight's Impact on PowerBook Battery Life?

Viltvodlian Deoderan asks: "So, Spotlight for Mac OS X Tiger is very cool. I can now let my innate ability to disorganize things shine through. However, when using my PowerBook unplugged, it seems that my battery lasts a noticeably less time. A close reading of Ars Technica's description of how spotlight works suggests that this is due to keeping the index file up-to-date on disk. Has anyone else noticed the same thing? Does someone have a better explanation for why my battery seems to drain out, prematurely? Is there some way real-time indexing can be turned off to conserve power?"

Comments

Umm..

[imstanny]

Try turning off the pr0n. you're welcome.

To answer your question

[amichalo]

From here:
To turn indexing on or off for a volume, run sudo mdutil -i on volume name or sudo mdutil -i off volume name, respectively. For example, if you want to turn off indexing for a volume called Backup, the command would be sudo mdutil -i off /Volumes/Backup .

Now to give you some grief about it:
This is pretty basic stuff - the less the hardware is used, the less power it will consume. If Spotlight, or any other app, is accessing the disk, then it will need power to do so. Likewise, if Spotlight is doing a bunch of searching through it's index that has to be loaded into RAM from the disk and those queries must be computed by the OS, then the disk and OS and RAM are all getting a workout.

What I recommend is that you check out what it is you are doing. If you are copy and moving files all over the place, or mounting and unmounting CDs, those processes would cause HD/CD usage as well as Spotlight indexing on top of that. Likewise, if you are doing a lot of Spotlight searching, there will be more usage because you are querying a DBMS.

Perhaps your battery is just coincidentally needed a replacement and/or non-spotlight related OS tweeks are changing power consumption.

Re:To answer your question

[Goo.cc]

One time I noticed was Spotlight causing me trouble was when compiling applications in my home directory. (I guess it was trying to keep up with the compiler as it created files.) I didn't want to turn off indexing on the whole volume, so I created a folder called "Src.noindex", as any folder with a .noindex extension is not indexed by Spotlight. This solved my problem.

It should be noted that although you can turn off the Spotlight service itself, using the above mentioned "sudo mdutil -i off /volname" is much better, as you will still be able to find things by filename. Turning off the Spotlight service disables finding completely, by content or filename.

I've had a lot of problems with my PB since 10.4

[porkchop_d_clown]

I've got half a gig, but I'm swapping constantly and apps like Safari regularly swell to consume all available RAM.

Widgets that access the internet regularly consume a hundred megs of swap and mdimport will start eating processor at random moments. Mail.app regularly tries to index the hundreds of thousands of files on my company's Exchange server and comes to a screeching halt.

Frankly, Tiger's been a major disappointment.

Easy

[neurotypical]

Drag the volume you don't want indexed into the Privacy pane in Spotlight preferences.

Re:Spotlight? Could be anything

[ciroknight]

No, I've experienced this too with a quite new iBook. Before Tiger I'd get battery life of just under 6 hours. Afterwards I'm lucky to get 5.

I believe it's correctly attributed to Spotlight, as every now and again, even when the machine is sitting plugged in and resting on my kitchen counter, I can hear it whirl it's harddisk as if it's indexing.

I would like a control panel applet to tune Spotlight, but I can wait. I already did my part in the deal (gave them an email and a submission on their website).

And for the trolls of the world, Apple's not perfect either. This is the first time this kind of tool has been included in an operating system, and it's something that will take quite a bit of time to tune and work out correctly. To be honest, in all of my works to do something similar, I've came out with the same results to a much lower quality, and any tool I've seen to do the same will probably harm my battery's life even more.

Have you confirmed it?

[jhealy1024]

I'm not saying that it *isn't* Spotlight, but just about anything could be chewing up your battery. Widgets, indexing, screen savers, or even poor Engergy Saver settings. Have you checked to make sure that Spotlight is what's killing your battery?

Several people have been complaining about a bug in Tiger and the 2005 Powerbooks that has to do with the trackpad:

http://www.macosxhints.com/article.php?story=20050 808165343661

It seems that the new tracking features eat up a lot of processor time (and thus, a lot of battery as well).

Again, I'm not dissing the Spotlight issue: it's definitely something to look at. But if you're still having trouble, you might check on other factors that can kill your battery life.

Here's a script to print out battery info...

[porkchop_d_clown]

#!/bin/bash

[ -x /usr/sbin/ioreg ] && \ /usr/sbin/ioreg -p IODeviceTree -n "battery" -w 0 | \
        sed -ne '/| *{/,/| *}/ {
                s/^[ |]*//g /^[{}]/!p
        }' | \
        awk '/IOBatteryInfo/ {
                A=$3 $4
                gsub("[{}()\"]","", A)
                gsub(","," ",A)
                print($1, $2, A)
        }'
# EOF

Save that as a shell script, when you run it from terminal it will produce info like this:

"IOBatteryInfo" = Capacity=4046 Amperage=1157 CycleCount=483 Current=2837 Voltage=12187 Flags=838860807 AbsoluteMaxCapacity=4400

The difference between AbsoluteMaxCapacity and Capacity gives you an idea of how much my battery has faded since it was new...

Re:Here's a script to print out battery info...

[hattig]

sed: 2: "/| *{/,/| *}/ {
        ...": bad flag in substitute command: '/'

Maybe I should have bought that sed and awk book ...

#!/usr/bin/perl

my $info = `/usr/sbin/ioreg -p IODeviceTree -n "battery" -w 0`;
my $batteryinfo = $info;
$batteryinfo =~ s/\n//g;
$batteryinfo =~ s/^.*\"(IOBatteryInfo)\" = \(\{(.*)\}\).*$/$1\n$2/g;
$batteryinfo =~ s/\"([\w ]*)\"=/\t$1: /g;
$batteryinfo =~ s/,/\n/g;
print $batteryinfo . "\n\n";

Does the trick too though, and is easily modifiable to log the fields too. It outputs in the format:

IOBatteryInfo
        Capacity: 4400
        Amperage: 18446744073709550638
        Cycle Count: 9
        Current: 3262
        Voltage: 11655
        Flags: 4
        AbsoluteMaxCapacity: 4400

God, do I have to type in loads of standard english text here to get it to submit? Bah! Well, here I am, stuck at home waiting for a delivery of a hard drive and drive enclosure. I'm sitting on my iBook wondering when it will turn up. I should be at work, but I can get away with not turning up as I can work from home. Foo foo foo foo. Is that a van I can hear? It appears not, no, wait, yes it is! Hurrah, a parcel! Fun fun fun fun. Gosh, I wonder if this is enough text.

No, it is not enough text. Sheesh, how frustrating. For a site for geeks, it is remarkably frustrating to post geeky stuff.

I'm just going to add logging to the script above, and then I can do what I said I'd do above.

Re:Here's a script to print out battery info...

[pi_rules]

Or... you could open up the System Profiler and look at it.

Re:Spotlight? Could be anything

[ActionGaz]

I believe it's correctly attributed to Spotlight, as every now and again, even when the machine is sitting plugged in and resting on my kitchen counter, I can hear it whirl it's harddisk as if it's indexing.

That's not how Spotlight works. When you first installed Tiger it needed to go through all the existing files and index them, but that process is surely done by now.

All it does now is respond to new files being created or files being changed. It doesn't need to scan for these as it is told directly by the operating system when the changes take place.

The constant disk access must be some other process.

not Spotlight's fault, it's a problem with OS X

[wilton]

Read this:

http://www.macosxhints.com/article.php?story=20050 808165343661

It is actually a bug with the driver for the new USB scrolling trackpad. This has been noted in various forums and Apple are aware of this problem.

If you plug in an external mouse and disable the trackpad, or replace the driver with SideTrack, the problem goes away.

This only effects the 2005 Powerbooks, and causes much higher CPU and memory load.

Will

Could be Dashboard - Try This Command

[Jackdaw Rookery]

Open Terminal and type this command, followed by return:

defaults write com.apple.dashboard mcx-disabled -boolean YES

Restart the dock, dashboard is dead.

To get dashboard back type:

defaults write com.apple.dashboard mcx-disabled -boolean NO

It's not spotlight

[kataflok]

Spotlight put the machine through hell for a few days while it indexed everything it could find -- then it went to sleep.

Dashboard was eating battery life by 20% and increasing wait times on certain apps significantly -- that is until I killed it. Battery life instantly jumped right back up.

Spotlight is a one off issue that lasts about a day -- Dashboard is the ongoing PITA.

Re:What do you consider an average load?

[TheRaven64]

Every time you modify a file, it is re-indexed. If you are downloading a lot of files, or touching a lot of files, then it is a good idea to add the folder containing them to the privacy list in the Spotlight settings in System Preferences. I have ~/tmp set to ignore, and I do anything here that I don't mind not being indexed. Although considering how rarely I use Spotlight, I should probably add a lot more...

To turn Spotlight off...

[MrPerfekt]

Add this to /etc/hostconfig:

SPOTLIGHT=-NO-

Reboot, and you're done. The indexing service won't even load at boot. The spotlight icon will still be in the corner but will do absolutely nothing when you type in a string.

And by the way, a watched pot also never boils. I think you're just imagining that it's sucking up all your battery. But hey, it may use a few extra cycles and use up your battery a little quicker.

Re:What do you consider an average load?

[Jord]

1. Open spotlight preferences, select privacy tab
2. Open finder window
3. Select go to folder in the finder menu
4. Type /tmp
5. Drag tmp folder to privacy list in spotlight preferences tab.
6. profit!