I cannot answer your question. I understand that the application is a "black box" and you cannot look inside it. In one post, you stated that the "cost" for a cache lookup (I guess in terms of instructions) is identical to the "cost", in instructions, for a DASD I/O, only "faster" (less elapsed time). This seems unlikely to me, but I cannot prove it. You did not say whether this file is NSR or LSR. I think that makes a difference to the VSAM CPU instruction path length. Also, the more buffers, the more CPU it would take to search them (unless VSAM uses some very efficient hashing technique, which would work for DIRECT/KEYED processing, but BROWSE? I am not so sure.). So, my question would be: "Have you measured the response time with varying amounts of buffering?". I'm really curious if fewer buffers might actually decrease response time. Or perhaps "even out" response time with a possible decrease in CPU instructions. Especially on a FICON attached DASD (if your DASD is FICON attached, that is).
All I have are questions. No real help. -- John McKown Senior Systems Programmer UICI Insurance Center Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. ---------------------------------------------------------------------- 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
