MS> Under OS/2 WARP GA you CAN:

 MS>  DosAllocMem(1byte,READ/WRITE)
 MS>  DosSetMem(64K,committed) -> OK
 MS>  DosSetMem(64K+1byte committed) -> ERROR

 MS>  so, it appears as 64K IS allocated whatever you say 
 MS> refering to ancient OS/2 toolkits prior to DevCon8. 

The memory is not "backed by physical storage" until the
DosSetMem(64k,...).  Until then it is just (wasted) address space.

Actually,  even that's not quite true under Warp (or even later 2.11
fixpaks).  Even a committed page will not be backed by physical ram until
it is referenced for the first time.   Additionally, If a page contains all
zeros,  it is "packed",  and the ram is discarded.  For example,
this program will not commit much ram at all:


 #define INCL_NOPMAPI
 #define INCL_DOS
 #include 
 #include 
 #include 

 int main(int argc, char **argv)
 {
     ULONG ul;
     APIRET rc;
     PBYTE mem;
     int i;

     ul = atol(argv[1]);
     printf("Allocating %d bytes\n", ul);

     rc = DosAllocMem((PPVOID)&mem, ul,  PAG_COMMIT | PAG_WRITE | PAG_READ);
     if(rc){
         printf("sys%04u: dosallocmem()\n", rc);
         return 1;
     }
     printf("Memory not really commited yet;  Press enter\n");
     getchar();

     printf("Touching %d pages:\n", ul/0x1000);
     for(i=0; i * Origin: Sol 3 * Toronto * V.32 * (905)858-8488 (1:259/414)

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