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get value of free -m , used buffer

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linux-howto

http://www.unix.com – i would like to get the value -/+ buffers/cache used who is 212, how can i do this? i have free -m | grep -i mem | awk '{ print $2 }' for get value of total memory total used free shared buffers cached Mem: 7972 1237 6735 0 465 558 -/+ buffers/cache: 212 7760 Swap: 8001 0 8001 (HowTos)

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Submitted by more on 10/18/2012

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can anyone tell me where the memory is gone: (no, this time neither buffers nor cache)

# free total used free shared buffers cached Mem: 3928200 3868560 59640 0 2888 92924 -/+ buffers/cache: 3772748 155452 Swap: 4192956 226352 3966604

top, sorted by memory, descending:

top - 13:42:06 up 1 day, 3:47, 2 u

In my Ubuntu 11.10 VPS, Before I run the jar file:

# free -m total used free shared buffers cached Mem: 256 5 250 0 0 0 -/+ buffers/cache: 5 250 Swap: 0 0 0

Run a jar file that limited to maximum of 32M memory:

java -Xms8m -Xmx32m -jar ./my.jar

Now the memory

I have two servers, server1 and server2. Both of them are identical HP blades, running the exact same OS (RHEL 5.5).

OS:Xen Cloud Platform 1.1 (XCP) modified centos, and xen server 5.0 running on intel i5

free -m

total used free shared buffers cached

Mem: 309 136 172 0 1 17

-/+ buffers/cache: 117 191

Swap: 511 7 504

df -h

none 380M 0 380M 0% /de

we have a server with 8GB, running mysql, 4 java applications and a small postgres db.

I have an issue where when I try to build a really large project, my machine starts swapping (several GB) even though there's plenty of memory (14 GB in fact).

The following three outputs were taken essentially simultaneously:

top:

top - 02:54:36 up 2 days, 13:50, 3 users, load average: 0.05, 0.05, 0.09 Tasks: 181 total, 1 running, 179 sleeping, 0 stopped, 1 zombie %Cpu(s): 2.5 us, 0.8 sy, 0.0 ni, 96.6 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 16158632 total, 11234480 used, 4924152 free, 844 buffers KiB Swap: 16777212 total,

I have VPS server with 1.25GB ram and 0.51GB cache trying to up an e-commerce website with 200k items, db now is about 2gb anything is now works terrible slow now because of lack memory mysql queries takes about 30 seconds to complete on the peak memory usage.

Critical Memory 47 weeks 1 day ago

My Redhat server shows the following:

free -m ============= total used free shared buffers cached Mem: 8113 8078 35 0 171 6491 -/+ buffers/cache: 1415 6698 Swap: 8189 59 8130

Is 35 mega of free memory considered critical on a production server ?