Re: linux /proc/sys/vm/pagecache for oracle

NetComrade wrote:
> Does anyone know what this parameter has been replaced with on RedHat
> 4.0?
>
> I just noticed over 10G of my memory is used for file system caching.
>
> [root_at_mars ~]# more /proc/meminfo
> MemTotal: 16032636 kB
> MemFree: 4643788 kB
> Buffers: 156844 kB
> Cached: 10390004 kB
> SwapCached: 24 kB
> Active: 2662108 kB
> Inactive: 8228036 kB
> HighTotal: 0 kB
> HighFree: 0 kB
> LowTotal: 16032636 kB
> LowFree: 4643788 kB
> SwapTotal: 8385920 kB
> SwapFree: 8385892 kB
> Dirty: 64 kB
> Writeback: 0 kB
> Mapped: 2274900 kB
> Slab: 123408 kB
> Committed_AS: 12578340 kB
> PageTables: 213160 kB
> VmallocTotal:536870911 kB
> VmallocUsed: 109584 kB
> VmallocChunk:536760867 kB
> HugePages_Total: 0
> HugePages_Free: 0
> Hugepagesize: 2048 kB
>
> # sysctl -w vm.pagecache="1 15 80"
> error: 'vm.pagecache' is an unknown key
>
> # cat /proc/vmstat | grep nr_mapped
> nr_mapped 568747
>

In general, on any 2.6 kernel (not only redhat), you should use /proc/sys/vm/swappiness.

Regards

-- 
Fabrizio Magni

fabrizio.magni_at_mycontinent.com

replace mycontinent with europe