Paul Gilmartin wrote:
| What particular penalty is incurred by not having the | end of one's buffer doubleword aligned, supposing 32767 | fits one's data well? The chief problem with not having "the end of one's [i-th] buffer" doubleword-aligned is that the beginning of the (i+1)-th and all subsequent buffers will not have their beginnings doubleword aligned. A logical record will not then in general be doubleword aligned in its buffer, with the consequence that it will be unusable for locate-mode i/o operations if any of its fields has an internal halfword, fullword, or doubleword alignment requirement. Alignment within a record in the responsibility of the programmer, not the system; but the system makes the assumption of this responsibility possible by aligning STORAGE-obtained blocks of storage, buffers, etc., on a doubleword boundary. Move-mode i/o is, as I am sure you know, tedious. I am alsooo sure that I have sometimes suspected you unfairly of seeking only to épater l’IBM when you pose such questions, but this time? John Gilmore Ashland, MA 01721-1817 USA _________________________________________________________________ Windows Live™ SkyDrive: Get 25 GB of free online storage. http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_skydrive_032009 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
