Memory Missing ?

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Operating Systems Solaris Memory Missing ?
# 1  
Old 08-13-2009
Memory Missing ?

Hello All,

I have oracle running on Solaris 5.10 SPARC 64bit.
Physical memory is 16Gb.

   114 oraprd     13G   13G    82% 513:25:53 0.4%
    46 root      180M  225M   1.4% 149:13:33 0.1%
     6 daemon     42M   45M   0.3%  14:01:59 0.0%

the above prstat -t shows the usage is 13g+225m+45m ~= 14g
So, there should be 2Gb left free isn't it ?

But top command says only 888m is free.

CPU states: 97.3% idle,  1.3% user,  1.4% kernel,  0.0% iowait,  0.0% swap
Memory: 16G phys mem, 888M free mem, 16G swap, 16G free swap

 0 0 0 15267768 907448 389 1304 0 4 4 0  0  0  0  0  0 1791 6466 2342  1  1 98

Could someone help me figure out where the memory has gone ?
Are there some memory consuming processes which are not shown in prstat ?

# 2  
Old 08-14-2009
Originally Posted by JohnJacobChacko
Could someone help me figure out where the memory has gone ?
What says:
kstat -n system_pages

# 3  
Old 08-14-2009

 kstat -n system_pages
module: unix                            instance: 0
name:   system_pages                    class:    pages
        availrmem                       461413
        crtime                          66.127922396
        desfree                         15917
        desscan                         25
        econtig                         71303168
        fastscan                        139873
        freemem                         113888
        kernelbase                      16777216
        lotsfree                        31834
        minfree                         7958
        nalloc                          35809032
        nalloc_calls                    14227
        nfree                           25497809
        nfree_calls                     9262
        nscan                           0
        pagesfree                       113888
        pageslocked                     1541317
        pagestotal                      2037418
        physmem                         2042666
        pp_kernel                       297263
        slowscan                        100
        snaptime                        11914951.224096

# 4  
Old 08-14-2009
2.2 GB (pp_kernel =297263) is used by the kernel. Is isn't shown by prstat as the kernel isn't a process.
# 5  
Old 08-16-2009
Originally Posted by jlliagre
2.2 GB (pp_kernel =297263) is used by the kernel. Is isn't shown by prstat as the kernel isn't a process.

Is pp_kernel in Kbytes ? How did you come to the conclusion that the kernel takes 2.2 Gb ?

# 6  
Old 08-16-2009
These values represent a number of pages. On x86, page size is 4K while on SPARC, it is 8K.
# 7  
Old 08-19-2009
if you are using zfs then that is where its at. zfs caches the memory. download the script from here if you are.
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