[RFC] why the amount of cache from "free -m" and /proc/meminfo are different?

[RFC] why the amount of cache from "free -m" and /proc/meminfo are different?

[Xishi Qiu]

[root@localhost ~]# free -m
              total        used        free      shared  buff/cache   available
Mem:          48295         574       41658           8        6062       46344
Swap:         24191           0       24191

[root@localhost ~]# cat /proc/meminfo
MemTotal:       49454896 kB
MemFree:        42658360 kB
MemAvailable:   47456052 kB
Buffers:               0 kB
Cached:          3727824 kB
SwapCached:            0 kB
Active:          2010196 kB
Inactive:        1784204 kB
Active(anon):      66612 kB
Inactive(anon):     8948 kB
Active(file):    1943584 kB
Inactive(file):  1775256 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      24772604 kB
SwapFree:       24772604 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         66672 kB
Mapped:            38440 kB
Shmem:              8984 kB
Slab:            2480092 kB
SReclaimable:    1291500 kB
SUnreclaim:      1188592 kB
KernelStack:        4480 kB
PageTables:         4928 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    49500052 kB
Committed_AS:     254220 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:     18432 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      140864 kB
DirectMap2M:     5093376 kB
DirectMap1G:    47185920 kB

[root@localhost ~]# uname -a
Linux localhost.localdomain 4.5.0-rc1-0.1-default+ #4 SMP Sat Jan 30 05:38:10 EST 2016 x86_64 x86_64 x86_64 GNU/Linux

[root@localhost ~]# rpm -qa | grep procps
procps-ng-3.3.10-3.el7.x86_64

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Re: [RFC] why the amount of cache from "free -m" and /proc/meminfo are different?

[Daniel K.]

On 02/05/2016 07:50 AM, Xishi Qiu wrote:
> [root@localhost ~]# free -m
>               total        used        free      shared  buff/cache   available
> Mem:          48295         574       41658           8        6062       46344
> Swap:         24191           0       24191
> 
> [root@localhost ~]# cat /proc/meminfo
> Buffers:               0 kB
> Cached:          3727824 kB
> Slab:            2480092 kB

free and meminfo seems to match up pretty well to me.

Are you really asking about display in MB vs kB?

Drop the -m switch to free.

Also, give 'man free' a spin, it explains what's behind the numbers.


Daniel K.

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Re: [RFC] why the amount of cache from "free -m" and /proc/meminfo are different?

[Xishi Qiu]

On 2016/2/5 19:44, Daniel K. wrote:

> On 02/05/2016 07:50 AM, Xishi Qiu wrote:
>> [root@localhost ~]# free -m
>>               total        used        free      shared  buff/cache   available
>> Mem:          48295         574       41658           8        6062       46344
>> Swap:         24191           0       24191
>>
>> [root@localhost ~]# cat /proc/meminfo
>> Buffers:               0 kB
>> Cached:          3727824 kB
>> Slab:            2480092 kB
> 
> free and meminfo seems to match up pretty well to me.
> 
> Are you really asking about display in MB vs kB?
> 

Hi Daniel,

No, I mean "Cached: 3727824 kB" and "buff/cache 6062M" are different.

Does "buff/cache" include Buffers, Cached, and Slab?

Thanks,
Xishi Qiu

> Drop the -m switch to free.
> 
> Also, give 'man free' a spin, it explains what's behind the numbers.
> 
> 
> Daniel K.
> 
> .
> 



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