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Full Discussion: Memory usage in AIX server
Operating Systems AIX Memory usage in AIX server Post 302843467 by zaxxon on Tuesday 13th of August 2013 11:56:39 AM
Old 08-13-2013
  1. Yes, thatīs totally normal. Most RAM is being used to cache files so access to slower disks can be hopefully avoided.
  2. Correct, see 1. It depends on your tuning parameters when and how much memory will be freed. Usually from AIX 5.3 TL... (forgot it), the tuning parameters for VMM are good and usually donīt need adjustment.
  3. If your system actually does page out to Paging Space or page in from there, it will be very slow. So either by tuning or enough memory, you will try to avoid paging at all cost. Therefore these days, you can use a fix amount of Paging Space, which may be rather small compared to RAM. I would use a fix size of 5 GB.
 

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MEMORY(3T)																MEMORY(3T)

NAME
_TIFFmalloc, _TIFFrealloc, _TIFFfree, _TIFFmemset, _TIFFmemcpy, _TIFFmemcmp, - memory management-related functions for use with TIFF files SYNOPSIS
#include <tiffio.h> tdata_t _TIFFmalloc(tsize_t); tdata_t _TIFFrealloc(tdata_t, tsize_t); void _TIFFfree(tdata_t); void _TIFFmemset(tdata_t, int, tsize_t); void _TIFFmemcpy(tdata_t, const tdata_t, tsize_t); int _TIFFmemcmp(const tdata_t, const tdata_t, tsize_t); DESCRIPTION
These routines are provided for writing portable software that uses libtiff; they hide any memory-management related issues, such as deal- ing with segmented architectures found on 16-bit machines. _TIFFmalloc and _TIFFrealloc are used to dynamically allocate and reallocate memory used by libtiff; such as memory passed into the I/O routines. Memory allocated through these interfaces is released back to the system using the _TIFFfree routine. Memory allocated through one of the above interfaces can be set to a known value using _TIFFmemset, copied to another memory location using _TIFFmemcpy, or compared for equality using _TIFFmemcmp. These routines conform to the equivalent ANSI C routines: memset, memcpy, and memcmp, repsectively. DIAGNOSTICS
None. SEE ALSO
libtiff(3T), malloc(3C), memory(3C) October 15, 1995 MEMORY(3T)
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