HP-UX 11i September 2001 Release Notes

Process, Threads, Memory, and Kernel Parameters

HP-UX SCA Process and Memory Management (new at 11i original release)

Chapter 8

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HP-UX SCA Process and Memory Management (new at

11i original release)

For compatibility reasons, the HP-UX 11i release supports the Scalable Computing

Architecture (SCA) programming, locality management, and memory management

features that were introduced at HP-UX 11.10 for the HP V-Class SCA servers. However,

these features do not provide any potential performance beneﬁts and no previous HP-UX

SCA features have changed.

NOTE HP V-Class SCA servers are not supported by the HP-UX 11i release, and all 11i

supported systems are non-SCA servers that consist of a single “locality domain” that

includes all of the system’s hardware resources. As a result, any use of the HP-UX SCA

features on HP-UX 11i systems will result in the default locality placement and memory

allocation behaviors.

However, at the HP-UX 11i release you can use the /usr/bin/mpsched command to

inquire about system processors, launch programs with "gang schedule" enabled, and

bind or unbind processes to processors (CPUs). You also can use mpsched to inquire

about process bindings.

Useful mpsched command options include:

• -c (bind command or PID to speciﬁed processor ID)

• -g (launch command with gang scheduling enabled)

• -p (speciﬁc PID: process ID)

• -q (inquire about process, requires -p)

• -s (list system status, including processor IDs)

• -u (unbind speciﬁed process, requires -p)

You should not use the mpsched command’s locality placement policy features because

they provide no beneﬁts on supported HP-UX 11i systems.

See the mpsched (1) manpage for details.