HP-UX Reference (11i v2 04/09) - 5 Miscellaneous Topics (vol 9)

a
Aries(5) Aries(5)
(Itanium(R)-based System Only)
2. A value fixed by Aries based on current value of kernel tunable parameter
pa_maxssiz_32bit
as follows:
if (pa_maxssiz_32bit < 128 MB)
max_pa_stack_size = pa_maxssiz_32bit - 48 MB
else
max_pa_stack_size = pa_maxssiz_32bit - 64 MB
AMA is divided into different memory regions as follows:
pa_maxssiz_32bit = max_pa_stack_size +
PA-RISC Application stack size (-ssz) +
Aries heap size (-heap_ssz) +
Aries translation code buffer size (-ccsz) +
5 MB (Aries Dynamic Translator heap) +
5 MB (Aries data etc)
Examples:
1. If a 32-bit PA-RISC application requires a 128 MB stack size, set kernel tunable parameter
pa_maxssiz_32bit
to
128 MB (-ssz) + 22 MB (-heap_ssz) + 16 MB (-ccsz) + 10 MB = 176 MB
2. If a 32-bit PA-RISC application requires a maximum possible stack size, set the kernel tunable param-
eter
pa_maxssiz_32bit
to
383 MB (-ssz) + 22 MB (-heap_ssz) + 16 MB (-ccsz) + 10 MB = 431 MB
3. If a 32-bit PA-RISC application requires a 128 MB of Aries heap, assuming 32 MB of application
stack, set the kernel tunable parameter
pa_maxssiz_32bit
to
32 MB (-ssz) + 128 MB (-heap_ssz) + 16 MB (-ccsz) + 10 MB = 186 MB
64-bit Aries
At process startup time Aries reserves space for the PA-RISC application stack in AMA. Maximum size of
PA-RISC application stack is computed as follows:
max_pa_stack_size = least of following two factors:
1. ti_current value in structure of type
tuneinfo2_t defined in
/usr/include/sys/dyntune.h
by making system call tuneinfo2 with parameter
maxssiz_64bit.
2. max_pa_stack_size = pa_maxssiz_64bit - 224 MB
AMA is divided into different memory regions as follows:
pa_maxssiz_64bit = max_pa_stack_size +
PA-RISC Application stack size (-ssz) +
Aries heap size (-heap_ssz) +
Aries translation code buffer size (-ccsz) +
8 MB (Aries Dynamic Translator heap) +
25 MB (Aries data etc).
Examples:
1. If a 64-bit PA-RISC application requires a 512 MB stack size, set kernel tunable parameter
pa_maxssiz_64bit to
512 MB (-ssz) + 128 MB (-heap_ssz) + 64 MB (-ccsz) + 33 MB = 737 MB
2. If a 64-bit PA-RISC application requires the maximum possible stack size, set kernel tunable parame-
ter
pa_maxssiz_64bit to
1024 MB (-ssz) + 128 MB (-heap_ssz) + 64 MB (-ccsz) + 33 MB=1249 MB
3. If a 64-bit PA-RISC application requires a 512 MB of Aries heap, assuming 256 MB of application
stack, set kernel tunable parameter
pa_maxssiz_64bit to
HP-UX 11i Version 2: September 2004 − 8 − Hewlett-Packard Company Section 5−−47