W dniu 2012-07-06 21:49, Lloyd Fuller pisze: >> Consider the cost of a CEX operation as ((ICSF call CPU)+I/O) and the cost >> of a >> CPACF operation as ((ICSF call)+(some >CPU cycles for the operation)). So >> the >> difference is I/O vs. CPACF cycles. The I/O cost doesn't change (much) with >> larger >blocks; the CPACF cycles do. > > This statement implies that CPACF REQUIRES ICSF. That is NOT true.
ICSF services do require ICSF. CPACF facilities can be called as assembler statements. However this require changes in the application. Not to mention, it's easier to call ICSF services from high level language (my opinion). > You can > happily do CPACF operations yourself without ICSF even configured on the > system. IBM's white papers about CPACF performance indicate that ICSF > imposes a > big performance hit on CPACF. No, it depends! For some cases the difference between ICSF and assembler calls are not significant. Last but not least: Crypto Express facilities are available (officially) only as ICSF services, so if you want to compare CPACF and CryptoExpress performance, it's quite good idea to have all remaining circumstances the same. Otherwise you analyze ICSF code overhead. -- Radoslaw Skorupka Lodz, Poland -- Tre tej wiadomoci moe zawiera informacje prawnie chronione Banku przeznaczone wycznie do uytku subowego adresata. Odbiorc moe by jedynie jej adresat z wyczeniem dostpu osób trzecich. Jeeli nie jeste adresatem niniejszej wiadomoci lub pracownikiem upowanionym do jej przekazania adresatowi, informujemy, e jej rozpowszechnianie, kopiowanie, rozprowadzanie lub inne dziaanie o podobnym charakterze jest prawnie zabronione i moe by karalne. Jeeli otrzymae t wiadomo omykowo, prosimy niezwocznie zawiadomi nadawc wysyajc odpowied oraz trwale usun t wiadomo wczajc w to wszelkie jej kopie wydrukowane lub zapisane na dysku. This e-mail may contain legally privileged information of the Bank and is intended solely for business use of the addressee. This e-mail may only be received by the addressee and may not be disclosed to any third parties. If you are not the intended addressee of this e-mail or the employee authorised to forward it to the addressee, be advised that any dissemination, copying, distribution or any other similar activity is legally prohibited and may be punishable. If you received this e-mail by mistake please advise the sender immediately by using the reply facility in your e-mail software and delete permanently this e-mail including any copies of it either printed or saved to hard drive. BRE Bank SA, 00-950 Warszawa, ul. Senatorska 18, tel. +48 (22) 829 00 00, fax +48 (22) 829 00 33, www.brebank.pl, e-mail: i...@brebank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 0000025237, NIP: 526-021-50-88. Wedug stanu na dzie 01.01.2012 r. kapita zakadowy BRE Banku SA (w caoci wpacony) wynosi 168.410.984 zotych. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
