Performance Guidelines
Determine the maximum size of the virtual=real area for a real machine
with 384K of real storage. The VM/370 system requires 244K to IPL. r r, r " I I 384K , 1384K - 256K" ARS 384K - 1244K + 4KI----1 + 12K + 4KI-----------I' , I 256K I I 64K , t
L L .J ARS = 384K -[244K + 4K[2] + 12K + 8K] ARS = 384K -[272K] ARS 112K
L .J.J Note that the fraction 384/256 in the trace table calculation is rounded
to the next higher integer, two.
r r "
! 1384K - 256K -112KI I VRS = 384K - 1244K + 8K + 12K + 4KI-----------------1 + 16K I , I 64K I , L L .J .J r r , , I I 16, I VRS = 384K - 1264K + 4KI--1 + 16K I I 1641 I L L L .J VRS = 384K -[28 OK] VRS = 104K
Note that the calculation RM - 256K - ARS 64K
results in a fraction that is then replaced by zero. Part 1. Planning for System Generation 15

Performance Guidelines
Determine the maximum size virtual=real area for a real machine with
1792K of real storage. The V"/370 system requires 244K to IPt. r r, r " 1 11192KI 11192K - 256KII ARS = 1192K - 1244K + 4KI-----I + 12K + 4KI------------I' I I 256KI ,64K II L L.I L .1.1 ARS = 1192K - [244K + 4K[1] + 12K + 4K[24]] ARS = 1192K - [244K + 28K + 12K + 96K] A RS = 179 2K -[3 8 OK ] ARS = 1412K r r " I 11192K - 256K - 1412KI 1 VRS = 1192K - 1244K + 28K + 12K + 4KI--------------------I + 16K I , I 64K I I L L .1.1 r r, , I 11241 I VRS = 1192K - 1284K + 4KI---I + 16K, I I 64, I L L.I .I VRS = 1792K - [308K] VRS = 1484K Note that the fraction (124/64) resulting from the R" - 256K - ARS 64K calculation in Formula 2 is rounded to the next higher integer, two.
16 VM/370 Planning and System Generation Guide