The applications problem occurs when user applications take so much of the sys-tem resources that network performance is degraded. In special cases it may be necessary to load network tasks in special partitions to ensure that they have suf-ficient memory in which to run. Any such situation would need to be handled on an individual basis.
The loading problem may occur when using NCP to load the network in systems where memory is at a premium. This problem is discussed in Section 3.2.3.
Getting Ready for RSX-11 M/M-PLUS NETGEN 3-7
3-8
Figure 3-1: Partition Layout after SYSGEN (CEXPAR Added)
GEN
FCPPAR (OPTIONAL)
SYSPAR
DRVPAR (OPTIONAL)
TTPAR (OPTIONAL)
LDRPAR (OPTIONAL)
CEXPAR
DSR (POOL)
EXECUTIVE
~ HIGH
~ (16 or 20K WORDS)
>-Executive Address Space
~O
TW213
Table 3-1: Approximate Sizes of Key Components DECnet Components
RSX-IIM Executive DSRpool
Communications Executive FIIACP
NETACP NMVACP NTINIT
Size *
Varies (see Note I) Varies (see Note I)
IK-1.SK (see Note I) 2K-9K (see Note 2) 4K-SK (see Note 3) 6K (see Note 4) 2.0K
DECnet-RSX Network Generation and Installation Guide
Table 3-1 (Cont.): Approximate Sizes of Key Components
* Approximate number of decimal words
Getting Ready for RSX-11 M/M-PLUS NETGEN
(continued on next page)
3-9
Table 3-1 (Cont.): Approximate Sizes of Key Components Notes:
1. RSX Executive, Dynamic Storage Region (DSR) pool, and Communications Execu-tive together total 16K or, if you choose the large ExecuExecu-tive, 20K. You can change this figure somewhat depending upon your needs and resources (see Section 3.2.5.9). The Communications Executive varies from 1 to 1.5K, depending upon what lines and options you have selected.
2. Files 11 ACP (F11ACP) is available in four sizes ranging from approximately 2K to 9K. If you put F 11ACP in a partition with other larger components (for example, NETACP), use of the smaller two F11ACPs is not recommended. The smallest F11ACP does not provide full functionality, and the next larger is heavily overlaid.
The small F11ACPs are optimized for minimum memory size, not performance, and since the memory is already allocated, a higher performance F 11ACP is recom-mended. The third F11ACP in order of size is 5K, provides full functionality, and is moderately overlaid. (See the RSX-IIM System Generation Manual for more infor-mation on F 11ACP .)
3. NETACP comes in two sizes, 4K and approximately 5K. The smaller version does not support network command terminals and layered products.
4. NMVACP is initially built for GEN as a 4K word task. In that size, it can handle only one user. However, when additional requests come in, it extends itself to a larger size. You can also install it with an increment to handle more users, thus eliminating the need for it to extend itself. In this case, the formula for determining the decimal word size of NMVACP is:
4K+(170xu)
The variable u is the number of users that NMV ACP can service (it starts with a base of 2). See Section 3.2.4 for more information on NMV ACP.
5. The minimum required network software (in addition to CEX) consists of AUX, ECL, XPT, NETACP, network pool, at least one DDM, and RCP (for a full routing node).
Excluding NETACP, which you may wish to load in a separate partition as shown here, these components total approximately 12K words (14K for DECnet-11M-PLUS).
6. The minimum DECnet/PSI system is 20K words (22K for DECnet-11M-PLUS). This minimum is for a node with a single DLM circuit. The minimum DECnet/PSI system consists of AUX, ECL, XPT, DLM, PLI, one DDM (KMX, KMY, KMV, SDP, or SDV), LAB (only when the DDM is SDP or SDV), and DLX (required on DECnet-11M-PLUS).
3-10 DECnet-RSX Network Generation and Installation Guide
3.2.1.1 Small RSX-11 M Systems
For small systems, the partition layout shown in Figure
3-2
is recommended as a way of solving loading problems.Figure 3-2: Partition Layout for Small RSX-11 M Systems
....- HIGH GEN
ALL OTHER TASKS FCPPAR
F11ACP NETACP NMVACP NTINIT
OTHER PARTITIONS
CEXPAR CEX
DSR (POOL)
EXECUTIVE
. . . - 0 TW214
Here, NET ACP, NMV ACP, and NTINIT are installed in FCPP AR, where they run along with FIIACP, the Files 11 ACP. NETACP must be generated as checkpointable. You should set the size of FCPP AR to accommodate the largest task in the partition. This will often be NET ACP. You can arbitrarily choose a size for FCPP AR that is too large (say 7K words) and then reduce the size appropriately after NETGEN, when you know actual sizes. All other network and user tasks are installed in GEN.
This layout ensures that NMV ACP and NTINIT do not tie up space in GEN that is required for loading. Putting NET ACP in FCPPAR also helps reduce fragmenta-tion.
Getting Ready for RSX-11 M/M-PLUS NETGEN 3-11
NOTE
This layout provides satisfactory performance if GEN is approximately 32K or larger. For smaller sys-tems, it is recommended that you avoid using NCP to load the network. Instead, use VNP to prepare a suit-able system image and then boot the system directly.
J
The smaller your G EN partition, the more important this recommendation. For information on VNP, see the DECnet-RSX Guide to Network Management Utilities.
3.2.1.2
Medium RSX-11 M Systems3-12
For medium size RSX-IIM systems, the partition layout in Figure 3-3 is recom-mended.
Figure
3-3:
Partition Layout for Medium RSX-11 M SystemsGEN
ALL OTHER TASKS
ACPPAR NETACP
FCPPAR F11ACP NMVACP NTINIT
OTHER PARTITIONS
CEXPAR CEX
DSR (POOL)
EXECUTIVE
- - - HIGH
_ _ _ _ _ _ _ _ _ ----' _ _ 0
TW216
DECnet-RSX Network Generation and Installation Guide