On 1 Nov 2013 08:44:42 -0700, in bit.listserv.ibm-main you wrote: >Your code may be the best design possible but it still uses CPU. Redesigning >and rewriting code to be more efficient is not the point of zIIP processors. >They are simply an IBM sales tool to make the price if z hardware more price >competitive. Running code in zIIP is less efficient (code must be run in a >special SRB) but it much cheaper to use than the standard CPU. > >1. Specialty processors (zIIP, zAAP, IFL and others that IBM may implement) >are general CP's. They physically do the same things as a GCP. >2. Prices for specialty processors are significantly cheaper than a GCP. IBM >does not want customers to run everything on them. >3. To restrict customer usage of specialty processors, IBM must implement some >method for restricting the use of a specialty processor. >4. For IFL (Linux processors), IBM disabled some instructions that are >critical to z/OS, zVSE and zVM but never used by zLinux. This keeps customers >from assigning IFL's to z/OS because it will fail. >5. IBM intends zIIP to be used for system related workload (system overhead). >From their viewpoint, customers can easily justify paying for application CPU >usage. Its far more difficult to justify and portion out system overhead. >Customer charge various departments for their CPU usage. System overhead is >difficult to portion because of it's nature. Long ago when I was involved in >chargeback, we simply portioned database workload because we could not >attribute specific amounts to a specific group. With zIIP, this workload >becomes far less significant. > >6. zIIP is first restricted by requiring programs run under an SRB. SRB's are >a big security exposure so customers are unlikely to open them to their >programmers.
In the process of saving money are z ZIP and ZAP users introducing a security exposure? Is the code that runs under the ZIP and ZAP process code that normally run without any privileges in a problem state? Clark Morris >7. To restrict software vendors, the SRB must run in a special enclave. >Vendors must sign a non-disclosure agreement about this special enclave. I >suspect that IBM includes some sort of usage clause in that agreement. > >Jon Perryman > > > >>________________________________ >> From: Scott Ford <scott_j_f...@yahoo.com> >> >> >>After reading this thread, I understand the need for zIIP processors for >>heavy CPU processes, but what about resigning and rewriting these >>applications ? For us, who learned assembler or BAL ...we had less to use , >>cycle wise and storage, but still managed to develop good code. >> >> > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
