How can I tell how much memory my system has?

How can I tell how much memory my system has?


This is another `Frequently Unanswered Question'. In most cases, you
should not even attempt to find out.



If you really must, then it can usually be done, but in a highly
system-dependent fashion. For example, on Solaris, you can use
sysconf(_SC_PHYS_PAGES) and sysconf(_SC_PAGESIZE); on
FreeBSD, you can use sysctl(); on Linux you can read and parse
`/proc/meminfo' (being careful to allow any of the historically
valid formats for this file); other systems may have their own methods.
I'm not aware of any more portable methods.



For HP-UX (9 and 10), the following code has been contributed: 





struct pst_static pst;





if (pstat_getstatic(&pst, sizeof(pst), (size_t) 1, 0) != -1)


{


    printf(" Page Size: %lu\n", pst.page_size);


    printf("Phys Pages: %lu\n", pst.physical_memory);


}





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