2**0 = 1
>32760 = 4096 x 8
4096 * 8 = 32768
No power of 2 ends in a ZERO (or an odd number).
Whatever the real number is, it's greater than 27998.
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-Original Message-
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of
john gilmore
Sent: Sunday, May 02, 2010 9:16 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Calcul ate Tape B ytes to Tr acks
I have been watching subject lines get munged for a while. And so I
Mea culpa maxima: 32760 = 4095 x 8.
32760 is the largest multiple of 8 that is less than or equal to 2^15 - 1 =
32767, the capacity of a signed halfword.
The alignment of a buffer on a doubleword boundary does confer small
performance advantages in some circumstances. More important, it
>32760 = 4096 x 8
4096 * 8 = 32768
No power of 2 ends in a ZERO (or an odd number).
Whatever the real number is, it's greater than 27998.
-
Too busy driving to stop for gas!
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IBM is right.
BLKSIZE=32760 is the maximal signed integer value that is 1) not greater than
the capacity of a halfword (usually required to avoid control block overflow)
and 2) a multiple of 8, 32760 = 4096 x 8 (required for doubleword buffer
alignment).
John Gilmore, Ashland, MA 01721
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