SPEC CPU Flags Description file for HP HP-UX March 2010 Compilers

C.11.31.05 HP C/aC++ Developer's Bundle

B.11.31.10 HP Fortran 90 Compiler

last updated May-2009


Selecting one of the following will take you directly to that section:

Optimization Flags

Portability Flags

Compiler Flags

System and Other Tuning Information

HP-UX Kernel Tunables:

maxdsiz, maxdsiz_64bit - maximum size (in bytes) of the data segment for any user process

maxssiz, maxssiz_64bit - maximum size (in bytes) of the stack for any user process

maxrsessiz, maxrsessiz_64bit - maximum size (in bytes) of the RSE stack for any user process

filecache_max - maximum quantity of memory to utilize for filesystem buffer cache

filecache_min - minimum quantity of memory to utilize for filesystem buffer cache

fcache_fb_policy - sets policy for flushing filesystem buffer cache data to disk

base_pagesize - sets the base page size in KBytes

pagezero_daemon_enabled - enables/disables background zeroing of large pages

vxfs_ifree_timelag - sets the inode minimum existence time for VxFS filesystems

lcpu_attr - toggles the OS's use of hardware threads of cores in the default processor set

numa_policy - informs the kernel the order and priority by which cell-local vs global interleaved memory should be used on NUMA systems

HP-UX System Utilities

mpsched - binds processes to cpus or nodes

setboot - display and modify boot variables in stable storage

kctune - display and modify kernel tunable parameters

System Configuration Commands:

cpuconfig - EFI command to enable or disable a processor prior to booting. Also used to enable/disable hardware threading at the firmware level

Additional Notes on partitions and local memory:
The HP Integrity rx7640, rx8640, and Superdome systems may be configured as one large system or as multiple independent smaller systems via hard parititions (nPars). Each hard partition consists of one or more cells with their associated processors, memory, and I/O chassis, and is isolated from events in other partitions. The memory within a partition can either be assigned to local memory pools for each cell, or to an interleaved pool that is distributed by cache line across the cells. Partitions and their attributes can be created and modified via the support management station, or via the nPartition (par*) commands running on an os instance in a system partition.