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cstm & CPU number

 
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Jacky Wing
Regular Advisor

cstm & CPU number

Hello All,

I have an RP7420 with apparently 8 CPUs.
the CPUs from the ioscan & cstm is attached. How can I know if the cpu is dual core & i have 4 CPUs instead of single core & 8 CPUs?

My understanding is that if "CPU Slot Number" - "Cell Slot Number" & "Cabinet Slot Number" are the same - means it is the same cpu.

Another question, CPUs in RP7420 are to be installed if only 2 at slot 0 & 2 ?


15 REPLIES 15
Vijaykumar_1
Valued Contributor

Re: cstm & CPU number

There is no attachment..Pls attach it.

As per my knowledege you can identify it using the product no. of the CPU.
Jacky Wing
Regular Advisor

Re: cstm & CPU number

My bad.
Now attached!
Vijaykumar_1
Valued Contributor

Re: cstm & CPU number

RP7420 comes with default 4 cpu's per cell board.

If you have assigned an other cell board, then you have to check out.

But if it is a single board Npar then 4 physical cpu's are default.
Matti_Kurkela
Honored Contributor
Solution

Re: cstm & CPU number

At the end of each CPU block in the cstm output, after the HPMC/LPMC/TOC listing, there is a small diagram that indicates CPU locations (Cell, Cabinet/Slot, Module, Revision). In cell-hardware systems, this diagram includes the CPU model information.

The CPU revision is listed as "PA8800 3.2". This indicates the CPU model is PA-8800, which is always dual-core.

In the PA-RISC world, the *only* dual-core CPUs are PA-8800 and PA-8900. All the other PA-RISC CPUs are single-core.

MK
MK
Jacky Wing
Regular Advisor

Re: cstm & CPU number

In this case, since I got 8 cpus from ioscan means I have 4 physical cpus, each is dual core.

from the cstm output you see 4 cpus/cell; what does the CPU (0A) - CPU (0B) mean? isn't 0A or 0B a slot on the cell board?

can we mix PA8800 3.1 & PA8800 3.2 together?
Suraj K Sankari
Honored Contributor

Re: cstm & CPU number

Hi,
>>In this case, since I got 8 cpus from ioscan means I have 4 physical cpus, each is dual core.

Ans is No.

as per the CSTM output you have 8 Physical CPUs.

Suraj
Suraj K Sankari
Honored Contributor

Re: cstm & CPU number

Hi,
One more thing to know how many physical cpu you have run these commands.

1.top
2.dmesg | grep processor | wc -l

Suraj
Torsten.
Acclaimed Contributor

Re: cstm & CPU number

This is the problem when using duplicated threads here - too many answers.


As said before (other thread), the PA8800 is always dual core and you see 2 CPUs per CPU slot in cstm, hence you have 2 modules = 4 physical cores on each cell, 2 slots are still free.

Compare with

# parstatus

Hope this helps!
Regards
Torsten.

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Jacky Wing
Regular Advisor

Re: cstm & CPU number

Thank you Torsten,

I added another thread because I gave 10 points to one person and it seems that nobody looks to the thread anymore.

There is a conflicting information, though u torsten make more sense.

parstatus gave me 4 CPUs & 4 Empty slots per each cell, although the cell can host only 4 CPUs max, this is conflicting information, why can't they give us commands to get different sets of answers: Physical CPUs, Empty Slots, cores ...

Suraj, you are mistaken, 8 CPUs in ioscan, PA8800 (dual core) means 4 physical CPUs & means 4 slots available for expansion on both cells.