getpagesize differs from exec_pagesize

[hopehope_123]

hi ,

getpagesize returns: 16kb

/usr/include/asm/param.h , EXEC_PAGESIZE is 65536

Why do they differ?

What is the pagesize?


This is redhat linux ,2.1 , ia64 .


Regards,
hope

[Thomas Rongitsch]

Post by hopehope_123
hi ,
getpagesize returns: 16kb
/usr/include/asm/param.h , EXEC_PAGESIZE is 65536

16 kb => 2 ^ 16 = 65536 .... it's just another representation

Post by hopehope_123
Why do they differ?

It's the same.

Post by hopehope_123
What is the pagesize?

http://www.google.at/search?hl=de&q=page+size+virtual+memory&btnG=Suche&meta=
Cheers,
thomas

[Tommy Reynolds]

Post by hopehope_123
getpagesize returns: 16kb
/usr/include/asm/param.h , EXEC_PAGESIZE is 65536
Why do they differ?
What is the pagesize?

getpagesize() returns the virtual memory unit of granularity,
determined by the machine hardware.

EXEC_PAGESIZE is a fictional setting that is supposed to represent
the largest page size supported by any executable. It has no
relation to anything real.

Cheers

[hopehope_123]

Hi Tommy ,

16 kb => 2 ^ 16 = 65536

isn't it 16kb = 2^14 ?

and 65536 = 64KB. or do i lost my mind and forget the math?

Kind Regards,
hope

[Tommy Reynolds]

Post by Thomas Rongitsch
16 kb => 2 ^ 16 = 65536

^^
++---- Typo for 64kb? 64k == 65536 == 2^16

Post by Thomas Rongitsch
isn't it 16kb = 2^14 ?

Yup

Post by Thomas Rongitsch
and 65536 = 64KB. or do i lost my mind and forget the math?

Perhaps, but who am I to judge ;-?

Don't get hung up on getpagesize() .vs. EXEC_PAGESIZE because one is
an apple and the other an orange; any resemblance is purely
accidental.

Cheers