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Swap Device & Unix Disk Buffer

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Old 11-02-2005
Swap Device & Unix Disk Buffer
Does anyone know if when the Swap Device / Page file in unix is carrying out Page / Swap In's and Page / Swap outs, does it go through the Unix Disk Cache ( I am presuming raw partitions are not being used ) ?

Therefore if there is paging activity on a system ( measured by sar -p, sar -g and vmstat -p ), should this activity also be reflected at the Unix Disk Cache level ( measured through sar -b ) and ultamately at the disk io level ( measured through sar -d and iostat ).

Alternatively does the swap partition bypass the Unix Cache altogether ?

One other question - how does onboard disk caches ( i.e. chips embedded with the disk itself ) effect the unix cache and how do you measure this activity ?
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LEARN ABOUT DEBIAN

trf_flipregistershort

Trf_FlipRegisterShort(3)				     Library Functions Manual					  Trf_FlipRegisterShort(3)

NAME

       Trf_FlipRegisterShort - Swap the bytes of all 2-byte words contained in the buffer.

SYNOPSIS

       #include <transform.h>

       void Trf_FlipRegisterShort
       (
	    void *buffer,
	    int length
       );

PARAMETERS

       void *buffer
	      Data to swap.

       int length
	      Length of buffer (in byte).

DESCRIPTION

       Swap the bytes of all 2-byte words contained in the buffer.

SEE ALSO

       Trf_Init(3),  Trf_SafeInit(3),  Trf_IsInitialized(3),  Trf_CreateOptions(3),  Trf_DeleteOptions(3),  Trf_CheckOptions(3), Trf_SetOption(3),
       Trf_SetObjOption(3),  Trf_QueryOptions(3),  Trf_SeekQueryOptions(3),  Trf_WriteProc(3),	 Trf_CreateCtrlBlock(3),   Trf_DeleteCtrlBlock(3),
       Trf_TransformCharacter(3), Trf_TransformBuffer(3), Trf_FlushTransformation(3), Trf_ClearCtrlBlock(3), Trf_QueryMaxRead(3), Trf_Register(3),
       Trf_ConverterOptions(3), Trf_MDStart(3), Trf_MDUpdate(3), Trf_MDUpdateBuf(3), Trf_MDFinal(3), Trf_MDCheck(3), Trf_RegisterMessageDigest(3),
       Trf_LoadLibrary(3), Trf_XorBuffer(3), Trf_ShiftRegister(3), Trf_FlipRegisterLong(3), Trf_InitStubs(3)

c2man transform.h						  27 August 2002					  Trf_FlipRegisterShort(3)