cstm & CPU number

[Jacky Wing]

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 ?

[Vijaykumar_1]

There is no attachment..Pls attach it.

As per my knowledege you can identify it using the product no. of the CPU.

[Jacky Wing]

My bad.
Now attached!

[Vijaykumar_1]

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 · Accepted solution]

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

[Jacky Wing]

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]

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]

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.]

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

[Jacky Wing]

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.

[Torsten.]

Please post your parstatus.

[Torsten.]

By the way, you get more information when selecting item "1 - system" in cstm.

The max number of CPU per cell is shown as 8 (cores), because it assumes they are all dual core, hence 4 modules * 2 cores = 8 CPU cores per cell max.

[Jacky Wing]

parstatus -V didn't work alone.

attached is parstatus -c 0 -V & parstatus -c 1 -V.

Thanks

[Torsten.]

This is again the per cell per core information:

Type : 8830
Speed : 1000 MHz
CPU Status
=== ======
0 OK
1 OK
2 Absent
3 Absent
4 OK
5 OK
6 Absent
7 Absent

CPUs
===========
OK : 4
Deconf : 0
Max : 8


You know there are 4 slots per cell only.

Max 8 means max 4 dual cores per cell.


According to the loading rules this is CPU modules in slots 0 and 2.

[Jacky Wing]

Thank you all,

[Vijaykumar_1]

As mentioned in my earlier thread, a cell board can hold 4 CPU's.

In your case this means 4 cpu's dual cored and counts to 8.

-Vijay