Communicator e3000 MPE/iX Release 7.0 (C.70.00) (30216-90312)

74 Chapter5
Technical Articles
Future Support For Greater Than 8190 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 particular, in a future release of MPE/iX,
support for greater than 8190 processes will require > 2 GB of memory AND the BIGPIN
feature will need to be enabled.
Below is a table that compares the MAXPIN scaling values for Release 6.5(and before) and
to Release 7.0 scaling values.
Physical Memory (m) <= Release 6.5 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 [1]
1. For Release 7.0, the maximum MAXPIN value is still limited to 8190. In a future
(7.0-based) release of MPE/iX, this value will be increased. Greater than 8190 processes
will require > 2GB of memory AND will also require that the system is booted with the
BIGPIN feature enabled.
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
allowed MAXPIN equal to the maximum MAXPIN value for that release. On 6.5,