RAD SUPPORT
RAD_SUPPORT is a system parameter that enables RAD-aware code to be executed on systems that support Resource Affinity Domains (RADs); for example, AlphaServer GS160 systems and Integrity cell-based servers or BL8x0c i2 servers. A RAD is a set of hardware components (CPUs and memory) with common access characteristics.
Bits are defined in the RAD_SUPPORT parameter as follows:
RAD_SUPPORT (default is 207 for Alpha and 10944667 for Integrity servers)
RAD_SUPPORT (default is 207 for Alpha and 10944667
for Integrity servers)
___________________________________________________
3 2 2 2 2 1 1
1 8 7 4 3 6 5 8 7 0
+-----+-----+-----------+-----------+-----------+
|00|00| skip|ss|gg|ww|pp|00|00|00|00|0p|df|cr|ae|
+-----+-----+-----------+-----------+-----------+
| Bit 0 | (e) | Enable | Enables RAD support | ||||||||||||
| Bit 1 | (a) | Affinity | Enables Soft RAD Affinity (SRA) scheduling. Also enables the interpretation of the skip bits, 24-27. | ||||||||||||
| Bit 2 | (r) | Replicate | Enables system-space code replication | ||||||||||||
| Bit 3 | (c) | Copy | Enables copy on soft fault | ||||||||||||
| Bit 4 | (f) | Fault | Enables special page fault allocation. Also enables the interpretation of the allocation bits, 16-23. | ||||||||||||
| Bit 5 | (d) | Debug | Reserved to VSI | ||||||||||||
| Bit 6 | (p) | Pool | Enables per-RAD non-paged pool | ||||||||||||
| Bits 7-15 | Reserved to VSI | ||||||||||||||
| Bits 16-23 | If bit 4 is set, bits 16-23 are interpreted as follows:
Bits 16,17 (pp): Process = Pagefault on process (non global) pages Bits 18,19 (ww): Swapper = Swapper's allocation of pages for processes Bits 20,21 (gg): Global = Pagefault on global pages Bits 22,23 (ss): System = Pagefault on system space pages Encodings for pp, ww, gg, ss:
If bits 16-23 are 0, the defaults for pp, ww, gg, ss are interpreted as follows: Process = home RAD Swapper = current RAD (also sets home RAD for process) Global = random RAD System = base RAD | ||||||||||||||
| Bits 24-27 | If bit 1 is set, bits 24-27 are interpreted as a skip count value (power of 2). Example: If bits 24-27 contain a 3, the skip count is 8. If bits 24-27 contain a 5, the skip count is 32. If bits 24-27 are 0, the default of 16 is used as the skip count. | ||||||||||||||
| colspan="3" Bits 28-31 | Reserved to VSI | ||||||||||||||
For more information about using OpenVMS RAD features, see the OpenVMS Alpha Galaxy and Partitioning Guide or VSI OpenVMS Version 8.4 New Features and Documentation Overview. RAD_SUPPORT has the GEN attribute. REALTIME_SPTS has the DYNAMIC, GEN, and MAJOR attributes.
