Communicator e3000 MPE/iX Release 7.0 Express 1 (Software Release C.70.01) (30216-90328)

Chapter 5 91
Technical Articles
BIGPIN Feature: Support Up To 12000 Concurrent Processes.
improves resource utilization on low-end system (especially with respect to resident
memory usage).
The MAXPIN scaling algorithm has been around for several MPE/iX releases (originally
introduced when MAXPIN was increased from 1559 to 3119 – Release 2.0 timeframe).
When this algorithm was originally introduced, we supported several systems with VERY
small minimum memory requirements. Many of these systems are now obsolete. The
original algorithm was not updated to reflect changes in the HP e3000 product line.
In Release 7.0, we have a new MAXPIN scaling algorithm that is much more appropriate,
given today's low-end systems, and takes into account future enhancements to MPE/iX.
These improvements will continue to increase the maximum MAXPIN value for future
high-end systems.
The original MAXPIN-scaling adjusted MAXPIN based on the amount of physical memory
on a system. This will continue to be the case for Release 7.0. However, the algorithm uses
a different physical memory values and different MAXPIN values. In the future, additional
criteria may be added to the algorithm.
In MPE/iX Release 7.0 Express 1, support for greater than 8190 processes will require > 2
GB of memory, the BIGPIN feature must be enabled, and the system must be an N-Class
system.
Below is a table that compares the MAXPIN scaling values for Release 6.5 (and before) and
to MPE/iX Release 7.0 Express 1 scaling values.
Physical Memory (m) <= MPE/iX Release 6.5 MPE/iX Release 7.0
m < 32 MB 200 400 [2]
32 MB <= m < 48 MB 400 400 [2]
48 MB <= m < 64 MB 3000 400 [2]
m = 64 MB 5460 400 [2]
m > 64 MB 8190 400 [2]
m <= 64 MB n/a [3] 400
64 MB < m <= 256 MB 8190 [4] 1000
256 MB < m <= 512 MB 8190 [4] 2000
512 MB < m <= 1 GB 8190 [4] 4000
1 GB < m <= 2 GB 8190 [4] 8190
m > 2 GB 8190 [4] 8190/12000 [1]
1. For MPE/iX Release 7.0 Express 1 the maximum MAXPIN value will be 12000 if the
system has > 2GB of memory, is an N-Class system, and BIGPIN has been enabled in
SYSGEN. Otherwise, the maximum MAXPIN value is 8190..
2. All of these cases fall into the "m <= 64 MB" case on 7.0.
3. The "m <= 64 MB" case was broken down into finer granularity for MPE/iX releases
prior to 7.0.
4. On MPE/iX 6.5 (and earlier), any system with greater than 64 MB of memory was