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Full Discussion: AIX 6.1 memory tuning
Operating Systems AIX AIX 6.1 memory tuning Post 302887197 by dzodzo on Thursday 6th of February 2014 09:43:29 AM
Old 02-06-2014
vmstat -v shows that about 20% of memory pages are pinned (that would roughly correspond to those 13 GB for kernel). Does it mean that application doesn't use memory pinning (server is running Oracle+SAP)? svmon tells me that oracle and workprocesses use about 33 MB of pinned memory, perhaps it's the way they are designed. I'll have to check on some testing system what happens, if you continually increase memory for aplication, how it will affect OS behaviour.

Code:
             16842752 memory pages
             16281136 lruable pages
              2796643 free pages
                    5 memory pools
              3415001 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                 13.8 numperm percentage
              2258042 file pages
                  0.0 compressed percentage
                    0 compressed pages
                 13.8 numclient percentage
                 90.0 maxclient percentage
              2258042 client pages
                    0 remote pageouts scheduled
                  237 pending disk I/Os blocked with no pbuf
                    0 paging space I/Os blocked with no psbuf
                 2228 filesystem I/Os blocked with no fsbuf
                    0 client filesystem I/Os blocked with no fsbuf
                22230 external pager filesystem I/Os blocked with no fsbuf
                 70.0 percentage of memory used for computational pages

 

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Ns_Alloc(3aolserver)					   AOLserver Library Procedures 				      Ns_Alloc(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME
ns_calloc, ns_free, ns_malloc, ns_realloc - Memory allocation functions SYNOPSIS
#include "ns.h" void * ns_calloc(size_t num, size_t esize) void ns_free(void *ptr) void * ns_malloc(size_t size) void * ns_realloc(void *ptr, size_t size) _________________________________________________________________ DESCRIPTION
The AOLserver memory storage allocation code was moved into Tcl core beginning with Tcl 8.4.0. Starting with AOLserver 3.5, these memory allocation functions are wrappers that call Tcl_Alloc and Tcl_Free. Earlier versions of AOLserver used this fast memory storage allocator internally, or the platform's memory allocator depending on how you configured it. The actual amount of memory allocated or freed will be different from the requested amount. This is because the fast memory allocation code pools memory into chunks and manages that memory internally. In addition, the Tcl distribution may be compiled to allocate even more memory which is used internally for diagnostic reasons. Using ns_free to free memory created by routines other than ns_malloc, ns_realloc and ns_calloc will almost certainly result in segmentation faults or undefined behavior. The lowercase and mixed-case versions are identical; the lowercase versions are preferred. ns_calloc(num, esize) Allocates a block of memory that is num * esize large, zeros it, and returns a pointer to the beginning of the memory block or NULL if the operation fails. ns_free(ptr) ns_free() frees the memory space pointed to by ptr. This pointer must have been created with a previous call to ns_malloc(), ns_cal- loc() or ns_realloc(). If ptr is NULL, no operation is performed. ns_free() returns no value. ns_malloc(size) ns_malloc() allocates size bytes and returns a pointer to the allocated memory. The memory is not cleared. The value returned is a pointer to the allocated memory or NULL if the request fails. The memory must be freed by ns_free. ns_realloc(ptr, size) ns_realloc changes the size of the memory block pointed to by ptr to size bytes. The contents will be unchanged to the minimum of the old and new sizes. Newly allocated memory will be uninitialized. If ptr is NULL, the call is equivalent to ns_malloc(size); if size is equal to zero, the call is equivalent to ns_free(ptr). Unless ptr is NULL, it must have been returned by an earlier call to ns_malloc(), ns_calloc() or ns_realloc(). SEE ALSO
Tcl_Alloc(3), Tcl_Free(3) KEYWORDS
memory, allocation AOLserver 4.0 Ns_Alloc(3aolserver)
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