Free memory is wasted memory. You should only have free memory when the
system starts up, after that you want the system to use any free memory to
cache what ever it can. What does "free memory" really mean? To me it means
you have wasted memory if it is never used. I don't understand the problem.
John
On Tuesday 21 November 2000 16:41, Alister Waller wrote:
> I have a customer who says that his systems seems to be very memory hungry.
> Looking at the output below I can see that there is on 70MB of memory left
> out of 517MB.
>
> I was wondering if anyone could decipher the below output and suggest
> reasons for what is going on or for more reports I can produce to pintpoint
> whats eating memory.
>
> regards
>
> Alister
>
>
> ************************************************
> Hear is a dump of vmstat, with 35 users. It is a bit better today with 73
> meg free, Yesterday it had 42 user with about 3meg free and it alway seems
> to be using the swap file.
> I have been monitoring this a even at night with only one or two users the
> free memory is often only 10 to 20meg.
>
> I also noticed that the cpu usage for user programs always seems to site
> around 50% (the first day or two it never got above 10%) The only program I
> can see using this is klogd as you can see from TOP.
>
>
>
> Feel free to dialin and have look.
>
>
> Steve
>
> Last login: Tue Nov 21 15:36:56 2000 from
> [root@booth3 /root]# vmstat 2 10
> procs memory swap io system
> cpu
> r b w swpd free buff cache si so bi bo in cs us sy
> id
> 5 0 0 9972 73728 135660 219680 0 0 13 12 62 53 40 0
> 60
> 3 0 0 9972 73684 135664 219720 0 0 5 0 157 568 54 4
> 43
> 1 0 0 9972 73684 135664 219720 0 0 9 21 171 443 54 3
> 43
> 1 0 0 9972 73684 135664 219720 0 0 0 0 155 381 51 3
> 46
> 1 0 0 9972 73760 135664 219716 0 0 0 0 138 343 50 3
> 47
> 1 0 0 9972 73756 135664 219712 0 0 5 30 188 321 50 3
> 46
> 1 0 0 9972 75244 135664 219708 0 0 1 4 132 155 50 4
> 46
> 1 0 0 9972 75232 135668 219716 0 0 8 22 163 239 55 4
> 40
> 1 0 0 9972 75164 135676 219776 0 0 8 0 146 590 52 4
> 44
> 1 0 0 9972 75164 135676 219776 0 0 0 0 133 142 50 3
> 47
> [root@booth3 /root]# uptime
> 3:37pm up 3 days, 18:49, 35 users, load average: 1.03, 1.06, 1.02
> [root@booth3 /root]#
>
> [root@booth3 /root]# free
> total used free shared buffers cached
> Mem: 517124 442692 74432 110428 135888 220292
> -/+ buffers/cache: 86512 430612
> Swap: 1999968 9972 1989996
>
> 3:41pm up 3 days, 18:53, 35 users, load average: 1.08, 1.06, 1.01
> 219 processes: 217 sleeping, 2 running, 0 zombie, 0 stopped
> CPU states: 50.8% user, 2.7% system, 0.0% nice, 46.3% idle
> Mem: 517124K av, 443376K used, 73748K free, 110740K shrd, 136056K
> buff
> Swap: 1999968K av, 9972K used, 1989996K free 220584K
> cached
>
> PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
> 434 root 12 0 384 12 4 R 0 98.6 0.0 4295m klogd
> 28886 root 7 0 968 968 668 R 0 3.6 0.1 0:01 top
> 22589 rr 0 0 1224 1224 476 S 0 0.9 0.2 0:33 runcobol
> 28855 root 0 0 1528 1484 1184 S 0 0.9 0.2 0:00 sshd
> 20723 rr 0 0 1260 1260 476 S 0 0.7 0.2 1:41 runcobol
> 20919 rr 0 0 1288 1288 476 S 0 0.7 0.2 0:11 runcobol
> 10 root -20 -20 0 0 0 SW< 0 0.5 0.0 9:47 raid5d
> 20678 root 0 0 760 760 604 S 0 0.3 0.1 0:08
> in.telnetd
> 22544 root 0 0 760 760 604 S 0 0.1 0.1 0:06
> in.telnetd
> 25918 root 0 0 760 760 604 S 0 0.1 0.1 0:02
> in.telnetd
> 28150 root 1 0 760 760 604 S 0 0.1 0.1 0:01
> in.telnetd
> 1 root 0 0 120 68 52 S 0 0.0 0.0 0:08 init
> 2 root 0 0 0 0 0 SW 0 0.0 0.0 0:24 kflushd
> 3 root 0 0 0 0 0 SW 0 0.0 0.0 0:49 kupdate
> 4 root 0 0 0 0 0 SW 0 0.0 0.0 0:00 kpiod
> 5 root 0 0 0 0 0 SW 0 0.0 0.0 0:28 kswapd
> 6 root -20 -20 0 0 0 SW< 0 0.0 0.0 0:00
> mdrecoveryd
> 347 bin 0 0 372 352 304 S 0 0.0 0.0 0:00 portmap
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