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[solved] swap storm at a (small tinderbox)
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toralf
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Joined: 01 Feb 2004
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PostPosted: Wed Feb 25, 2015 4:20 pm    Post subject: [solved] swap storm at a (small tinderbox) Reply with quote

I own a dedicated server with 16 GB RAM, where I do run 6 chroot images for QA purpose under a hardened Gentoo with latest unstable hardened kernel always (just -j1 make job per chroot)

3 times within the last 14 days I observed a swap storm, where the (otherwise completely empty) swap is filled with 10-12 GB of data for about 1/2 an hour or so, making the system unresponsive.

After that used swap space goes down to 0 again (I see this using the tool isag from sysstat).

The 6 emerge logs don't show any suspicious packages emerged around that time and known to bloat the disk/memory needs.

What else could be the culprit ?


Last edited by toralf on Sat Jun 06, 2015 9:32 am; edited 1 time in total
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szatox
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PostPosted: Wed Feb 25, 2015 8:08 pm    Post subject: Reply with quote

You said nothing that could point to the cause, but why won't you just disable swap? If it happens again OOM killer will "try to kill the children first"
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toralf
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PostPosted: Wed Feb 25, 2015 8:15 pm    Post subject: Reply with quote

szatox wrote:
You said nothing that could point to the cause, but why won't you just disable swap? If it happens again OOM killer will "try to kill the children first"

Well, that's harsh method - but might work. Still looking however for a more smart solution.
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NeddySeagoon
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PostPosted: Wed Feb 25, 2015 8:16 pm    Post subject: Reply with quote

toralf,

No -flto ?
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
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toralf
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PostPosted: Wed Feb 25, 2015 8:33 pm    Post subject: Reply with quote

NeddySeagoon wrote:
toralf,

No -flto ?
yes - it is a server - there I made no experiments (except unstable hardened kernel) :
Code:
CFLAGS="-O2 -pipe -march=native"
CXXFLAGS="${CFLAGS}"
# WARNING: Changing your CHOST is not something that should be done lightly.
# Please consult http://www.gentoo.org/doc/en/change-chost.xml before changing.
CHOST="x86_64-pc-linux-gnu"
# These are the USE flags that were used in addition to what is provided by the
# profile used for building.
USE="dbus dnssec logrotate mbox mmx sse sse2 sse3 sse4 sse4.1 sse4.2 threads
     tor-hardening vim-syntax -bindist -hpn -ipv6 -ldap"
CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3"


Update
What I'm tried few minutes ago is to set
Code:
MaxMemInQueues  4 GB
in /etc/tor/torrc - default is 8 GB.
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