Q about swap size
fry.kun at gmail.com
Sun Jul 11 19:01:24 UTC 2010
On 07/11/2010 09:10 AM, Robert G. (Doc) Savage wrote:
> I've been running Fedora on my old Thinkpad A22p (P-III/M w/512MB)
> since FC4 or before, upgrading from one version to the next using the
> same partition sizes. For F13 I increased the size of /boot, but kept
> swap at 1GB:
> # fdisk -l /dev/sda
> Disk /dev/sda: 120.0 GB, 120034123776 bytes
> 255 heads, 63 sectors/track, 14593 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x000304c6
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 64 512000 83 Linux
> Partition 1 does not end on cylinder boundary.
> /dev/sda2 64 14463 115658752 83 Linux
> /dev/sda3 14463 14594 1048576 82 Linux swap / Solaris
> The last couple of releases have run agonizingly slowly with very high
> load averages (between 2.x and 10.x).
> I just read
> which recommends a minimum of 2GB swap size for memory sizes up to
> 4GB. I've been using 2x RAM for swap size ever since the 2.6 kernel
> was introduced. At the moment (running 'yumex') 'top' indicates:
> top - 10:43:15 up 2 days, 6 min, 5 users, load average: 8.62, 6.84, 6.26
> Tasks: 244 total, 7 running, 237 sleeping, 0 stopped, 0 zombie
> Cpu(s): 60.7%us, 23.5%sy, 9.2%ni, 0.0%id, 0.0%wa, 5.4%hi, 1.3%si, 0.0%st
> Mem: 509800k total, 502624k used, 7176k free, 16280k buffers
> Swap: 1048568k total, 317372k used, 731196k free, 101944k cached
> This indicates only about 30% of my 1GB swap is being used. Would
> increasing that to 2GB have any affect on the load average performance?
> --Doc Savage
> Fairview Heights, IL
Don't run Gnome/KDE desktops - they're memory hogs. Instead, try XFCE -
it's much lighter and faster (fewer features, though).
You have ~800MB of virtual memory used (mem used+swap used) with nothing
I have Thunderbird and Firefox and several small programs open; my virt
memory usage is at ~600MB. The rest of my 2G is buffers and caches.
Mem: 2061244k total, 1999948k used, 61296k free, 303296k buffers
Swap: 0k total, 0k used, 0k free, 917156k cached
As far as swap, keep it at 1G, it's a reasonable setting with your hardware.
With my 2G RAM, I have the swap partition at 2G, but keep it turned off
most of the time -- the programs I open rarely, if ever, fill up the 2G
and it's faster to not use the swap when you don't need it. But that's
just me, not a recommendation of any kind :)
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