Configuration 'quickscan'

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raboof
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Re: Configuration 'quickscan'

Post by raboof »

studio32 wrote:fs.inotify.max_user_watches = 524288
Still don't see what this does and why it's a good thing...[/quote]

With inotify, you can tell the kernel 'let me know if this file changes'. Without inotify, you'd have 'poll': hit the filessytem periodically to check if the file has changed yourself. That would lead to disk i/o, which is something you want to reduce to a minimum. AFAIK this setting increases the number of files you can put an 'inotify watch' on.

I seem to remember I copied this recommendation for a fairly trustworthy source, but I can't find it anymore - if I google, all I get is many people running this script ;).

studio32
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Re: Configuration 'quickscan'

Post by studio32 »

I don't see any license in the script...

tertl3
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Re: Configuration 'quickscan'

Post by tertl3 »

raboof wrote:
studio32 wrote:fs.inotify.max_user_watches = 524288
Still don't see what this does and why it's a good thing...
I am just curious about the particular number, 524288. Is that just an arbitrary large number?
Would it be o.k. to say, use a number n, where n >= 524288?

DLC11
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Re: Configuration 'quickscan'

Post by DLC11 »

tertl3 wrote:
raboof wrote:
studio32 wrote:fs.inotify.max_user_watches = 524288
Still don't see what this does and why it's a good thing...
I am just curious about the particular number, 524288. Is that just an arbitrary large number?
Would it be o.k. to say, use a number n, where n >= 524288?
It is a power of 2. 2^19. Doesn't exactly answer the question though. Perhaps 2^18 would be too few, and 2^20 would be too expensive? I don't know why it would have to be power of 2, though. Perhaps there is a reason.

tertl3
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Re: Configuration 'quickscan'

Post by tertl3 »

I'm just curious about the particular number, 524288. Is that just an arbitrary large number?
Would it be o.k. to say, use a number n, where n >= 524288?[/quote]
It is a power of 2. 2^19. Doesn't exactly answer the question though. Perhaps 2^18 would be too few, and 2^20 would be too expensive? I don't know why it would have to be power of 2, though. Perhaps there is a reason
.

Yes, I am curious about this. I didn't know that it was a power of 2. That narrows it down some. Does anyone know what fs.inotify is set to initially?

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autostatic
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Re: Configuration 'quickscan'

Post by autostatic »

tertl3 wrote:Does anyone know what fs.inotify is set to initially?
That depends on your distro. Ubuntu uses 8192.
And the value of 524288, maybe it's the maximal possible value?

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raboof
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Re: Configuration 'quickscan'

Post by raboof »

studio32 wrote:I don't see any license in the script...
Added GPL license texts to all files

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confusion_music
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Re: Configuration 'quickscan'

Post by confusion_music »

Absolutely brilliant is what I would like to say about quickscan.

I have only been using linux for about a year and only recently shelled out on a nice new cpu, lots of ram, new mobo etc. I've spent the last few weeks trying to work out why my performance seemed to be lacking (already had an m-audio 2496) and why I was getting really annoying xruns even at really high latencies.

Now its all gravy, thanks so much.

Bruce

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maghoxfr
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Re: Configuration 'quickscan'

Post by maghoxfr »

I can't run the script, I've read all this thread but didn't find the solution. I'm not sure what to do with all the content of https://realtimeconfigquickscan.googlecode.com/hg/. I only copied the "realTimeConfigQuickScan.pl" on a text and made it executable. But I get the following error:

Code: Select all

Can't locate QuickScanEngine.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.10.1 /usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .) at /home/maghox/diagnostico.pl line 21.
BEGIN failed--compilation aborted at /home/maghox/diagnostico.pl line 21.
I see that on the link there's the QuickScanEngine.pm mentioned in the error message, but I don't really know what to do about it. Does anyone know how to fix this? Thanks

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autostatic
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Re: Configuration 'quickscan'

Post by autostatic »


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maghoxfr
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Re: Configuration 'quickscan'

Post by maghoxfr »


Thanks, I did that and got this back

Code: Select all

hg clone https://realtimeconfigquickscan.googlecode.com/hg/ realtimeconfigquickscan
requesting all changes
adding changesets
adding manifests
adding file changes
added 19 changesets with 51 changes to 16 files
updating to branch default
16 files updated, 0 files merged, 0 files removed, 0 files unresolved
But how do I run it? I'm really lost.

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autostatic
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Re: Configuration 'quickscan'

Post by autostatic »

http://code.google.com/p/realtimeconfigquickscan/

So download everything you need:

Code: Select all

hg clone https://realtimeconfigquickscan.googlecode.com/hg/ realtimeconfigquickscan
cd into the directory that just got created:

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cd realtimeconfigquickscan
And run the script:

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perl ./QuickScan.pl

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maghoxfr
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Re: Configuration 'quickscan'

Post by maghoxfr »

Thanks Jeremy, it worked. Really helpful script.

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funkmuscle
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Re: Configuration 'quickscan'

Post by funkmuscle »

Hey guys, for regular usage of my computer, I use my stock kernel, will the script cause that kernel problems?

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raboof
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Re: Configuration 'quickscan'

Post by raboof »

funkmuscle wrote:Hey guys, for regular usage of my computer, I use my stock kernel, will the script cause that kernel problems?
The script only collects information and gives suggestions based on that, so no, it will not cause problems.

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