[CentOS] 2.6 memory management question
John Summerfield
debian at herakles.homelinux.org
Tue Apr 10 23:48:05 UTC 2007
tblader wrote:
>
>
> John Summerfield wrote:
>> tblader wrote:
>>> Hello all.
>>> I have a centos 4.4 box (2.6.9-42.0.10.ELsmp) with 7gig of ram that
>>> doesn't seem to be using swap (also 7gig now). I say "seem" because
>>> I've noticed ram utilization run around 95% (with oracle and friends
>>> running) and then firing up a couple apps to use that last 5% will
>>> stop the machine dead in it's tracks.
>>>
>>
>> What architecture is this beast?
>>
>>
>
> Hope this is is of use.
>
>
> [2]$ uname -virmop
> 2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 09:40:21 EST 2007 x86_64 x86_64
> x86_64 GNU/Linux
>
>
> [2]$ cat /proc/cpuinfo
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 15
> model : 67
> model name : AMD Athlon(tm) 64 FX-62 Dual Core Processor
> stepping : 2
> cpu MHz : 2800.038
> cache size : 1024 KB
> physical id : 0
> siblings : 2
> core id : 0
> cpu cores : 2
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext lm
> 3dnowext 3dnow pni cx16
> bogomips : 5603.52
> TLB size : 1088 4K pages
> clflush size : 64
> cache_alignment : 64
> address sizes : 40 bits physical, 48 bits virtual
> power management: ts fid vid ttp [4] [5]
>
> processor : 1
> vendor_id : AuthenticAMD
> cpu family : 15
> model : 67
> model name : AMD Athlon(tm) 64 FX-62 Dual Core Processor
> stepping : 2
> cpu MHz : 2800.038
> cache size : 1024 KB
> physical id : 0
> siblings : 2
> core id : 1
> cpu cores : 2
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext lm
> 3dnowext 3dnow pni cx16
> bogomips : 5599.20
> TLB size : 1088 4K pages
> clflush size : 64
> cache_alignment : 64
> address sizes : 40 bits physical, 48 bits virtual
> power management: ts fid vid ttp [4] [5]
>
>
>
> [2]$ cat /proc/meminfo
> MemTotal: 7128956 kB
> MemFree: 2132556 kB
> Buffers: 556832 kB
> Cached: 2821408 kB
A supplementary question, can anyone explain what "buffers" and "cached"
are? I have a performance problem with postgresql (discussion is on the
postgresql list), and I see those figures displayed by commands such as
free, top and procinfo but the man pages don't define them.
--
Cheers
John
-- spambait
1aaaaaaa at coco.merseine.nu Z1aaaaaaa at coco.merseine.nu
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