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Tom_
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Joined: 20 May 2004
Posts: 444
Location: France
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 Posted: Tue Dec 29, 2009 10:27 am Post subject: Gentoo system is becoming less and less responsive |
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Hello,
I've the impression that my Gentoo system is becoming less and less responsive.
I recently installed Fedora 12 on the same machine, and it seems much faster than my ~amd64 system!  For instance, launching Firefox from Fedora is quite fast, whereas it is damn slow here!
Prelink and Preload are already running on this system!
Is that something that i can do to improve its performances ?
Are my flags too aggressive ?
Emerge --info : http://paste-it.net/public/w874aa6/
Kernel config : http://paste-it.net/public/m4b2122/
Thank you in advance!
Last edited by Tom_ on Wed Dec 30, 2009 9:34 am; edited 1 time in total |
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sera
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| Posted: Tue Dec 29, 2009 10:42 am Post subject: |
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If the system becomes slower and slower over time an almost full harddisk and the resulting fragmentation might be the cause. What gives you
For firefox the profile in ~/ can make a huge difference. If firefox loads the browser history of the last two years you are doomed so to speak. Broken addons might cause a slowdown as well. Try with a blank profile to compare loadtimes. |
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Tom_
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Joined: 20 May 2004
Posts: 444
Location: France
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| Posted: Tue Dec 29, 2009 10:46 am Post subject: |
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df :
| Code: | thomas@gentoo ~ % df -h
Sys. de fich. Tail. Occ. Disp. %Occ. Monté sur
rootfs 40G 35G 3,3G 92% /
/dev/root 40G 35G 3,3G 92% /
rc-svcdir 1,0M 136K 888K 14% /lib64/rc/init.d
udev 10M 432K 9,6M 5% /dev
shm 1005M 1,2M 1004M 1% /dev/shm
cachedir 4,0M 4,0K 4,0M 1% /lib64/splash/cache
/dev/sda5 15G 9,0G 4,8G 66% /home
/dev/sda4 182G 132G 41G 77% /home/thomas/Divers
/dev/sdc1 151G 41G 102G 29% /home/thomas/Divers2
/dev/sdb1 276G 227G 49G 83% /home/thomas/Documents
/dev/sda1 40G 37G 2,4G 94% /media/windows
/dev/sda7 18G 4,4G 13G 26% /media/fedora |
Firefox was only an example! The problem is the same for the other applications! Everything seems slower on my Gentoo. :s
Thx |
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aidanjt
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Joined: 20 Feb 2005
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Location: Rep. of Ireland
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| Posted: Tue Dec 29, 2009 10:50 am Post subject: |
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sera was right, your rootfs is almost full while your fedora's rootfs is almost empty. Why do you have such a mess of partitions anyway?
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| juniper wrote: | | you experience political reality dilation when travelling at american political speeds. it's in einstein's formulas. it's not their fault. |
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sera
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| Posted: Tue Dec 29, 2009 10:53 am Post subject: |
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Your rootfs is full to 92%, this is way more than it should be and most certainly the cause.
If you have space to make a copy of your rootfs to a bigger partition do so from a livecd.
Now change grub.conf to use the new one. If and only if this works over some time I would delete the old partition.
Removing old kernel sources might help to free a few GB as well. |
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sera
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| Posted: Tue Dec 29, 2009 11:16 am Post subject: |
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Btw you should use tar to copy to preserve file attributes.
As a comparison here my df -h:
| Code: | Filesystem Size Used Avail Use% Mounted on
/dev/sda2 9.2G 1.5G 7.3G 17% /
udev 10M 100K 10M 1% /dev
/dev/sda5 9.2G 3.3G 5.5G 38% /var
/dev/sda6 1.9G 72M 1.7G 4% /tmp
/dev/sda7 19G 8.9G 8.6G 51% /usr
/dev/sda9 97G 52G 40G 57% /home
none 1005M 0 1005M 0% /var/tmp/paludis
none 1005M 0 1005M 0% /dev/shm
/dev/sdc1 9.4G 1.2G 8.2G 13% /usr/local/repositories
/dev/sdb1 1.4T 312G 994G 24% /mnt/file_storage
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A slightly older CPU (3700+), using stable, only -O2, no prelink nor preload and firefox starts 60 tabs in about 5 seconds. Tabswitching is instantaneous. |
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Tom_
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| Posted: Tue Dec 29, 2009 11:45 am Post subject: |
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I'm going to free some GB : old kernel sources, distfiles ... !
@AidanJT, I don't know why my partitions are so messy! I'll check that out! |
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Tom_
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| Posted: Tue Dec 29, 2009 12:30 pm Post subject: |
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I did a bit of cleaning and now i get 25GB free! 
For the partitions, i found some explanations for rootfs and /dev/root : it seems related to OpenRC, and absolutely normal!
If you've any idea for the others, i would be glad to hear it.
With a new clean profile, Firefox starts much quickly. 
Thx! |
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sera
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| Posted: Tue Dec 29, 2009 12:56 pm Post subject: |
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| This entry is normal for baselayout2. AidanJT probably meant the structure of /home and stuffing the rest of the system into just one partition. |
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Tom_
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| Posted: Tue Dec 29, 2009 1:11 pm Post subject: |
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I can't see the point of splitting the system in few partitions! I think it makes things more complicated!
I'm the only user of this machine, that's why my /home is structured like this :
- /home/thomas (my home) : settings and a few temporary docs
- /home/thomas/Documents : personal and important documents, pictures, important videos ...
- /home/thomas/Divers(2) : miscellaneous stuff : music, videos, dvb recordings ... |
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sera
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| Posted: Tue Dec 29, 2009 2:05 pm Post subject: |
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One of the problems with a single root partition is that a log file in /var can render your machine unbootable by taking all available space for instance.
For /tmp you most likely want to set the noexec option.
And so on.
There are reasons to split a rootfs. Primarly for security reasons but sometimes also for performance. In my case /usr/local/repositories lies on an fs with good small file performance. This partition includes the gentoo tree and all the cache files used in conjunction with repositories. The same files in /usr would take up around 4GB and read and write speeds would be halved or even worser.
Also on the fly compression/decompression may make enough difference for you. See the guides in this forum or on gentoo wiki regarding portage and squashfs for example.
I personally don't see why multiple partitions make things more complicated except for choosing partition size. However after using linux for a few years this should be easy enough for everyone.
Even so you have now space the files still are fragmented. Other than copy the rootfs an emerge -e world might greatly reduce the fragmentation now and is probably less error prone as it can be done in place. |
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Tom_
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Location: France
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| Posted: Tue Dec 29, 2009 2:29 pm Post subject: |
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This a desktop machine : creating partitions for security reasons is likely useless for me! However, this does matter for a server!
Having a special fs with good small file performance seems interesting : which fs do yo use ? ReiserFS ? What did you mean when you said that you store cache file in /usr/local/repositories? Portage cache files ?
I'll probably create a new partition for /usr/portage and the overlays with this kind of fs!
I'll also check out on the fly compression/decompression!
Can you copy/past your fstab ?
LVM2 could be nice to deal with multiple partitions easily but i don't really want to add a new layer.  |
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sera
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| Posted: Tue Dec 29, 2009 3:51 pm Post subject: |
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| Tom_ wrote: | | This a desktop machine : creating partitions for security reasons is likely useless for me! However, this does matter for a server! |
The log file example is real, have seen it happen twice. Where for the one having a separate /var partition only X refused to start. This were both desktops.
| Quote: | | Having a special fs with good small file performance seems interesting : which fs do yo use ? ReiserFS ? What did you mean when you said that you store cache file in /usr/local/repositories? Portage cache files? |
I did choose XFS. JFS and ReiserFS are sure other options. However if you want ultimate speed go for a solution like squashfs or some preloding into memory.
Cache files of whatever. Portage, paludis, my own tools etc. So on this machine paludis is the main package manager.
| Quote: | | Can you copy/past your fstab ? |
Sure, just don't take it as a school example. It reflects choices I made 5 years ago and honestly not much thought went into it.
For instance user implies noexec and nodev, so they are redundant and /tmp could be put into ram as well. So be it. Here you go:
| Code: | /dev/sda1 /boot ext2 noauto,noatime 1 2
/dev/sda2 / ext3 noatime 0 1
/dev/sda3 none swap sw 0 0
/dev/sda5 /var ext3 nosuid,defaults,noatime 0 0
/dev/sda6 /tmp ext2 defaults,noexec,noatime 0 0
/dev/sda7 /usr ext3 defaults,noatime 0 0
/dev/sda9 /home ext3 defaults,nosuid,noatime 0 0
/dev/sdb1 /mnt/file_storage ext4 noauto,noexec,nodev,noatime,user 0 0
/dev/sdc1 /usr/local/repositories xfs noexec,nodev,noatime,nosuid 0 0
none /var/tmp/paludis tmpfs uid=110,gid=1008,nr_inodes=1M 0 0
none /dev/shm tmpfs nodev,nosuid,noexec 0 0
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I omitted the entries not used during normal usage.
| Quote: |
LVM2 could be nice to deal with multiple partitions easily but i don't really want to add a new layer. |
As this machine is a single core I think I'm better off without lvm. |
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ppurka
Advocate
Joined: 26 Dec 2004
Posts: 3256
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| Posted: Tue Dec 29, 2009 5:51 pm Post subject: |
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| Tom_ wrote: | | I'll probably create a new partition for /usr/portage and the overlays with this kind of fs! |
You don't need to create a separate partition. Just create a separate file. Format it with ext2 and it will be good enough. Look here:
http://www.gentoo-wiki.info/TIP_Speeding_up_portage
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