Date: Fri, 24 Jul 1998 03:59:56 +0200 From: Markus Stumpf <maex-freebsd-hackers@Space.Net> To: freebsd-hackers@FreeBSD.ORG Subject: swap/memory management problem Message-ID: <19980724035956.H11327@space.net>
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System: FreeBSD 2.2.5-RELEASE #0
CPU: Pentium Pro (300.68-MHz 686-class CPU)
real memory = 268435456 (262144K bytes)
avail memory = 256962560 (250940K bytes)
Swap space configured 300 MB.
The machine is dedicated as cache/proxy server using squid-1.22-NOVM.
No other tasks than the minimum system processes running.
We have about 1.8 million objects in cache.
Squid claims memory demand of 178768 KB.
Now the problem:
If I start squid fresh it starts to read its "database" and grows in memory.
As soon as it reaches about 170 MB the systems starts to swap. Swap space
is filling slowly but after one day approx about 240 MBs are used.
The follwing numbers are from squid running for about 50 hours now.
"top" reports:
--------------
Mem: 129M Active, 47M Inact, 42M Wired, 32M Cache, 8224K Buf, 784K Free
Swap: 300M Total, 238M Used, 62M Free, 79% Inuse, 12K In
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
8021 root 2 -15 235M 173M select 135:57 0.38% 0.38% squid
"systat -vmstat":
-----------------
Mem:KB REAL VIRTUAL
Tot Share Tot Share Free
Act 196604 548 247308 704 36252 count
All 255936 676 1195900 1432 pages
Watched this a loooong ;-) time and never seen pages swapped out but only in.
The nasty thing with this is that squid is getting slower and slower and
even so the above numbers do no change its getting slower every day it
runs until I restart it.
I assume this all is due to proactive swapping?
Is there any chance to get rid of this behaviour? Would it help to reduce
the swap space to e.g. 30 MB? (the 27 GB disk is filled, so I don't think
squid will grow any further). Anything else I'm missing?
Thanks
\Maex
P.S. If there are any more infos on the system I could provide which would
help to solve the problem, I'd be glad to do so.
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