SVC itself performs a simple function. SVC together with its interrupt handlers is not so simple. What with the serialization for the GETMAIN or whatever it uses these days, I'd expect it to be at least as expensive as PC. If you need to operate in another address space, add in the overhead of acquiring, scheduling and freeing SRBs.
> The times that machine performance could be expressed in Million Instructions > Per Second are long gone. They've been gone for half a century, if they ever existed. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Vernooij, Kees (ITOP NM) - KLM <[email protected]> Sent: Thursday, August 29, 2019 8:27 AM To: [email protected] Subject: Re: Assembler :- PC Instruction "against SVC plus the SVC interrupt handler". Possibly also: Plus SVC code? The SVC instruction performs a function, the PC instruction does too. >From what I understood of the PC instruction: with 1 instruction you can now >execute a 'function' that might have taken pages of assembler instructions >before. The times that machine performance could be expressed in Million Instructions Per Second are long gone. Kees. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Peter Relson > Sent: 29 August, 2019 13:45 > To: [email protected] > Subject: Re: Assembler :- PC Instruction > > <snip> > You can do a BASR and STORAGE OBTAIN, STORAGE RELEASE and BR in less time > than a BAKR. > </snip> > > No you can't. > > <snip> > How does its performance stack up against SVC? > </snip> > > That's not a useful comparison. What is useful is "how does its > performance stack up against SVC plus the SVC interrupt handler". > > Peter Relson > z/OS Core Technology Design > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ******************************************************** For information, services and offers, please visit our web site: http://secure-web.cisco.com/1yFCMng_oi34MeuWoGQVFSplOg6fpaFLyxdbGdQb9STPypzNLAxj2z3H1yPe4hmcGsoQrveXhGIGpIQn4y5avwq7BULLqLr7LDIdVd3uZfyPSdpqKPZLOf85a9_UOdAfEEkGjPnXcTp7oZjO72UlCrOrkWCx9XGTouvxIvkrdhdxx7mbiJCUcsSNwdIhGoKmSm_S4VqyCCu_-5BvvEZ79ciMla-Ce6L9JM5Ftywxolu5eN46Eq6qEk2Cf-Zcs5T9IkVQzK7gnyAmr3_tZBL1XW1EDny_9mYCBo58WeWGmKDzZaHMjFOWAKa7le7wuJMXxvxGhuhm_EyVpP7hsmqb89fuquitBk3uYlWjLHQFCW51CPwAUMtM3_g4RZTozHtzb/http%3A%2F%2Fwww.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN h the ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
