Gentoo Archives: gentoo-performance

From: Colin Kingsley <ckingsley@×××××.com>
To: gentoo-performance@l.g.o, gpark@××××××.com
Subject: Re: [gentoo-performance] swap?
Date: Sat, 31 Jul 2004 16:44:13
Message-Id: 13cc2f7804073109446dd9f637@mail.gmail.com
In Reply to: Re: [gentoo-performance] swap? by Gyujin Park
1 um. that makes NO sense at ALL.
2 Besides, youve missed the point that using 99% of your physical memory
3 is not a problem. However, the fact that /proc/sys/vm/swappiness does
4 not exist is extreemly wierd, maybe you need support for it compiled
5 into your kernel. While youre at it, maybe you need to check some
6 other parts of your kernel config. Make sure you have shared memory
7 support compiled into your kernel!
8
9
10 On Sat, 31 Jul 2004 10:31:35 -0600, Gyujin Park <gark@××××××.com> wrote:
11 > thanks,
12 > weird though, swapiness does not exist in 2004.2 in this server. It does in my
13 > desktop 2004.0.
14 >
15 > but i found the big secret formula to clear up memory. Even though I am not sure.
16 > (Thanks to Bart Alewijnse)
17 >
18 > dd if=/dev/hda1 of=/dev/null bs=400M
19 >
20 > It frees out a lot of memory.
21 > However, swap still doesn't work.
22 >
23 > Tom
24 >
25 > On Sat Jul 31 10:25 , Colin Kingsley <ckingsley@×××××.com> sent:
26 >
27 > >just a thought. A server environment might benefit from setting the
28 > >swappiness factor higher. try echo "100" > /proc/sys/vm/swappiness
29 > >
30 > >On Sat, 31 Jul 2004 07:27:36 -0600, Gyujin Park gpark@××××××.com> wrote:
31 > >> Yes, response in Apache, and vsFTP gets really slow until more memory frees out.
32 > >> (Report from users and other admins while I was testing the system.)
33 > >>
34 > >> Thanks,
35 > >>
36 > >> Tom
37 > >>
38 > >> On Fri Jul 30 20:42 , Colin Kingsley ckingsley@×××××.com> sent:
39 > >>
40 > >> >As far as I know, your system should be stable. The details of how
41 > >> >much memory/swap is used at any given moment probably depends on your
42 > >> >kernel, how much memory you have, etc.
43 > >> >
44 > >> >Do you have any actual evidence of the slow down you mentioned? the
45 > >> >system should begin using swap when/if it needs to. it looks to me
46 > >> >like you discovered the "free" command and are seeing problems where
47 > >> >none exist.
48 > >> >
49 > >> >On Sat, 31 Jul 2004 03:53:58 +0200, lukas lukas@××××××.de> wrote:
50 > >> >> On Saturday 31 July 2004 02:42, Gyujin Park wrote:
51 > >> >> > Does this mean the system will be still stable with 99% memory usage?
52 > >> >> > I mean, at some point it should turn into swap. The system reaches up
53 > >> >> > to 99% physical memory usage with less than 3 MB of physical memory
54 > >> >> > left.
55 > >> >>
56 > >> >> "free" gives me the following outout on my workstation:
57 > >> >>
58 > >> >> total used free shared buffers cached
59 > >> >> Mem: 1550840 1308096 242744 0 94244 859148
60 > >> >> -/+ buffers/cache: 354704 1196136
61 > >> >> Swap: 522104 23868 498236
62 > >> >>
63 > >> >> About 84% memory is used. But about 900MB are used for caching and
64 > >> >> buffering, so in fact there are only about 346MB in "real use".
65 > >> >> If your memory is 99% without buffers and cache, then there is
66 > >> >> something wrong (but I don't know what).
67 > >> >> Can you see a process that consumes that much memory when you are
68 > >> >> calling "ps" or "top"?
69 > >> >> What kind of kernel do you use?
70 > >> >>
71 > >> >> cu
72 > >> >>
73 > >> >> lukas
74 > >> >>
75 > >> >>
76 > >> >>
77 > >> >
78 > >> >--
79 > >> >gentoo-performance@g.o mailing list
80 > >> >
81 > >>
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87 > >>
88 > >
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98 >
99
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Replies

Subject Author
Re: [gentoo-performance] swap? Bart Alewijnse <scarfboy@×××××.com>