System Tunable Mapping: Tru64 UNIX to HP-UX 11i v2

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Overview............................................................................................................................................ 2

System Tuning Options......................................................................................................................... 2

System V IPC Message Queue Attributes............................................................................................. 2

System V IPC Semaphores Attributes................................................................................................... 4

System V Shared Memory Attributes................................................................................................... 5

Process and Thread Attributes............................................................................................................ 6

Kernel Buffer Attributes ..................................................................................................................... 8

Virtual Memory Attributes.................................................................................................................. 9

Asynchronous I/O Attributes ............................................................................................................. 9

For more information.......................................................................................................................... 10

Summary of content (10 pages)

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System Tunable Mapping: Tru64 UNIX to HP-UX 11i v2 Overview............................................................................................................................................ 2 System Tuning Options ......................................................................................................................... 2 System V IPC Message Queue Attributes.............................................................................................
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Overview People often find that the general case for which systems are tuned fails to meet their needs. This document provides some information on the more common parameters that are tuned for Tru64 UNIX and the equivalent HP-UX parameters. This document provides information for HP-UX 11i v2. On Tru64 UNIX, you can adjust the default resource limits with the dxkerneltuner or sysconfig commands.
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The following table shows the system tuning options for System V IPC message queue attributes: Tru64 UNIX HP-UX Dynamic on HP-UX Description msg_max msgmax Yes Maximum message size in bytes. msg_mnb msgmnb Yes Maximum message queue size in bytes. msg_tql msgtql No Maximum number of messages in the system at any time. msg_mni msgmni No Maximum number of systemwide message queues (IDs) allowed.
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msg_mni (Tru64 UNIX) versus msgmni (HP-UX) This parameter specifies the maximum number of message queues that can exist simultaneously on the system. The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 50 for Tru64 UNIX, and 512 for HP-UX. The maximum value allowed on this parameter is higher for Tru64 UNIX than HP-UX. The maximum value for Tru64 UNIX is INT_MAX; the maximum value for HP-UX is 32767.
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for Tru64 UNIX and 2048 for HP-UX. The maximum value allowed on this parameter is different for Tru64 UNIX and HP-UX. The maximum value for Tru64 UNIX is INT_MAX; the maximum value for HP-UX is semmns. The default value for semmns is 4096; and the maximum value is 335534080 for HP-UX. sem_msl (Tru64 UNIX) versus semmsl (HP-UX) This parameter specifies the maximum number of individual System V IPC semaphores per semaphore identifier (ID).
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shm_mni (Tru64 UNIX) versus shmmni (HP-UX) This parameter specifies the number of System V shared memory segment identifiers in the system. The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 100 for Tru64 UNIX and 400 for HP-UX. The maximum value allowed on this parameter is different for Tru64 UNIX and HP-UX. The maximum value for Tru64 UNIX is 2^31-1; the maximum value for HPUX is 32768.
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max_threads_per_user (Tru64 UNIX) versus max_thread_proc (HP-UX) For Tru64 UNIX, this parameter defines the maximum number of threads per user. For HP-UX, this parameter defines the maximum number of concurrent threads allowed per process. The default value of this parameter is different for Tru64 UNIX and HP-UX. The default setting is 1024 for Tru64 UNIX, and 256 for HP-UX. The maximum value allowed on this parameter is higher on Tru64 UNIX than HP-UX.
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Kernel Buffer Attributes The following table shows the system tuning options for kernel buffer attributes: Tru64 UNIX HP-UX Dynamic on HP-UX Description bufcache nbuf and bufages (both deprecated on HP-UX 11i v2) No On HP-UX, sets the systemwide number of file-system buffer and cache buffer headers, The parameters are for backwards compatibility and should be set to 0 because the dynamic buffer cache is preferred.
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Virtual Memory Attributes The following table shows the system tuning options for virtual memory attributes based on HP-UX: Tru64 UNIX HP-UX Dynamic on HP-UX Description gh_chunks N/A N/A Number of 4-MB chunks of memory reserved at boot time for shared-memory use. rad_gh_regions[n] N/A N/A For NUMA systems, the granularity hints chunk size (in MB) for the Resource Affinity Domain (RAD) identified by n. maxvas (Version 4.0x only) N/A N/A Maximum Virtual Address Space. vpagemax (Version 4.
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For more information • • • • • • Simplify Integrity Performance Web site HP-UX Performance Forum Tuning SystemV IPC message-handling parameters on HP-UX 11iV2 Reconfiguring the Kernel for HP-UX 11iV2 Tru64 UNIX System Configuration and Tuning For questions, contact: tec-sipt@hp.com © 2006 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.