Number of SMP threads for PA-RISC architecture supported processors

[BBKKPP]

Hi all,

For PA-8800 and PA-8900, we can have 2 cores per CPU.
How many number of SMP threads supported for these processors?(means number of threads that each core can run)

Like we can have example of UltraSPARC T1 4-8 core processor for Solaris , for this we can have 4 SMP threads per core.


Thanks in advance,

[Dennis Handly]

You have 2 CPUs per socket, core == CPU.
It depends on what each thread is doing. If they are 100% CPU bound, each core should only run one thread. With other loads, you could run more threads.

[Duncan Edmonstone]

Hi,

PA-RISC processors don't implement any sort of coarse multi-threading (CMT) or symmetric multi-threadubg (SMT) schemes, so you get the same number of threads of execution as you have cores. For PA8800 or PA8900 thats 2 cores, so 2 threads.

Integrity servers running Montecito or Montvale Itanium CPUs do implement coarse multi-threading and can operate 2 threads per core. As these are dual-core processors that means 4 threads per socket. Of course you need an OS that can take advantage of this sort of technology - for HP-UX that's 11iv3 (11.31) only.

Don't assume that more threads equals a faster application - those UltraSPARC T1 threads are all very slow... what sort of workload are you looking at?

HTH

Duncan

[BBKKPP]

Thanks for quick reply, Its really helpfull
I just wanted to know number of cores for licensing purpose, and UltraSPARC was just an exmple.
Is thir any site from where we can get information about processors for HP?

[Torsten.]

Please see

http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1266809