Am 21.07.2013 16:42, schrieb Peter Wilmott: > On 21/07/13 15:31, luis jure wrote: >> OK, now i have my system successfully installed and running on my new >> SSD. >> now i have to decide what to do with the rest of the disk (it's a 256MB >> samsung). >> >> the first big question is: what about swap? i found some web pages >> (perhaps old) stating that it's not wise to put swap on the SSD >> because of >> all the read/writes. but apparently from what i read on the recent >> thread on this list, that shouldn't be much of a concern now. >> >> i also read somewhere that if you have swap on the SSD and want to avoid >> unnecessary read/writes, you can reduce swappiness. i have 12GB RAM and i >> think normally i don't really need swap space on disk, so i thought that >> could be a good idea. >> >> so what i'm planning to do now is: >> >> - put swap on the SSD >> - reduce swappiness >> - put /var/tmp/portage on tmpfs >> >> so, do you guys think that's a good setup? >> > TBH, unless you are really stressing your RAM usage (Lots of VMs or Java > applications, stuff like that) I'd go without swap. I've been running > swapless on 8GB of RAM for a number of years now with no issues. > > As for /var/tmp/portage on tmpfs, this is fine 95% of the time, however > even with ~2GB I allocate some packages (Chromium, LibreOffice, ect) > will fail to compile due to lack of space. In these cases I just > un-mount /var/tmp/portage, do the compile on the disk, and then re-mount > it. >
Portage can do that for you for packages you know to need that much space:
markus@Nanga-Parbat ~ $ cat /etc/portage/env/notmpfs
PORTAGE_TMPDIR="/var/tmp_notmpfs"
[Fr 26.07.13 22:06 CEST][pts/2][x86_64/linux-gnu/3.10.1-gentoo][5.0.2]
markus@Nanga-Parbat ~ $ cat /etc/portage/package.env
www-client/firefox notmpfs
[Fr 26.07.13 22:06 CEST][pts/2][x86_64/linux-gnu/3.10.1-gentoo][5.0.2]
markus@Nanga-Parbat ~ $ mount | grep /var/tmp
/dev/mapper/Nanga--Parbat--SSD-system--var--tmp_notmpfs on
/var/tmp_notmpfs type btrfs (rw,noatime,ssd,autodefrag,compress=lzo)
none on /var/tmp type tmpfs (rw,size=6350m)
(Firefox is still in there from my pgo-builds, I should remove that now :D)
Also:
markus@Nanga-Parbat ~ $ free -h
total used free shared buffers cached
Mem: 15G 12G 3,6G 0B 336M 6,0G
-/+ buffers/cache: 5,7G 9,9G
Swap: 0B 0B 0B
never had any problems without swap, since i got more than 4GB of RAM ;)
Regards,
Markus
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