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Tunable Kernel Parameters: HP-UX Release 11i Version 1.6 > Chapter 7 Memory Paging Subsystem

Memory Paging Parameter Summary

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Memory Paging

allocate_fs_swapmap

Enable or disable preallocation of file system swap space when swapon() is called as opposed to allocating swap space when malloc() is called. Enabling allocation reduces risk of insufficient swap space and is used primarily where high availability is important. Manpage: allocate_fs_swapmap(5).

Memory Paging

max_mem_window

Maximum number of group-private 32-bit shared memory windows. Manpage: max_mem_window(5).

Memory Paging

nswapdev

Maximum number of devices, system-wide, that can be used for device swap. Set to match actual system configuration. Manpage: nswapdev(5).

Memory Paging

nswapfs

Maximum number of mounted file systems, system-wide, that can be used for file system swap. Set to match actual system configuration. Manpage: nswapfs(5).

Memory Paging

remote_nfs_swap

Enable or disable swap to mounted remote NFS file system. Used on cluster clients for swapping to NFS-mounted server file systems. Manpage: remote_nfs_swap(5).

Memory Paging

swapmem_on

Enable or disable pseudo-swap allocation. This allows systems with large installed memory to allocate memory space as well as disk swap space for virtual memory use instead of restricting availability to defined disk swap area. Manpage: swapmem_on(5).

Memory Paging

swchunk

Amount of space allocated for each chunk of swap area. Chunks are allocated from device to device by the kernel. Changing this parameter requires extensive knowledge of system internals. Without such knowledge, do not change this parameter from the normal default value. Manpage: swchunk(5).

Memory Paging

allocate_fs_swapmap

Enable or disable preallocation of file system swap space when swapon() is called as opposed to allocating swap space when malloc() is called. Enabling allocation reduces risk of insufficient swap space and is used primarily where high availability is important. See allocate_fs_swapmap(5).

Variable Page Size Parameter Summary

Memory Paging: Size

vps_ceiling

Maximum system-selected page size (in KB) if the user does not specify a page size. Manpage: vps_ceiling(5).

Memory Paging: Size

vps_chatr_ceiling

Maximum page size a user can specify with the chatr command in a program. Manpage: vps_chatr_ceiling(5).

Memory Paging: Size

vps_pagesize

Minimum user page size (in KB) if no page size is specified using chatr. Manpage: vps_pagesize(5).

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