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тАО02-22-2023 10:27 AM - last edited on тАО02-23-2023 09:09 PM by support_s
тАО02-22-2023 10:27 AM - last edited on тАО02-23-2023 09:09 PM by support_s
Why do ioscan and sar/vmstat report different number of processors?
Hello Folks,
a customer has a PA-Risc system, model "9000/800/rp8420" running HP-UX 11v1 ("B.11.11").
"ioscan -kfnC processor" reports 32 processors:
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
processor 0 0/10 processor CLAIMED PROCESSOR Processor
processor 1 0/11 processor CLAIMED PROCESSOR Processor
processor 2 0/12 processor CLAIMED PROCESSOR Processor
processor 3 0/13 processor CLAIMED PROCESSOR Processor
processor 4 0/14 processor CLAIMED PROCESSOR Processor
processor 5 0/15 processor CLAIMED PROCESSOR Processor
processor 6 0/16 processor CLAIMED PROCESSOR Processor
processor 7 0/17 processor CLAIMED PROCESSOR Processor
processor 8 1/10 processor CLAIMED PROCESSOR Processor
processor 9 1/11 processor CLAIMED PROCESSOR Processor
processor 10 1/12 processor CLAIMED PROCESSOR Processor
processor 11 1/13 processor CLAIMED PROCESSOR Processor
processor 12 1/14 processor CLAIMED PROCESSOR Processor
processor 13 1/15 processor CLAIMED PROCESSOR Processor
processor 14 1/16 processor CLAIMED PROCESSOR Processor
processor 15 1/17 processor CLAIMED PROCESSOR Processor
processor 16 2/10 processor CLAIMED PROCESSOR Processor
processor 17 2/11 processor CLAIMED PROCESSOR Processor
processor 18 2/12 processor CLAIMED PROCESSOR Processor
processor 19 2/13 processor CLAIMED PROCESSOR Processor
processor 20 2/14 processor CLAIMED PROCESSOR Processor
processor 21 2/15 processor CLAIMED PROCESSOR Processor
processor 22 2/16 processor CLAIMED PROCESSOR Processor
processor 23 2/17 processor CLAIMED PROCESSOR Processor
processor 24 3/10 processor CLAIMED PROCESSOR Processor
processor 25 3/11 processor CLAIMED PROCESSOR Processor
processor 26 3/12 processor CLAIMED PROCESSOR Processor
processor 27 3/13 processor CLAIMED PROCESSOR Processor
processor 28 3/14 processor CLAIMED PROCESSOR Processor
processor 29 3/15 processor CLAIMED PROCESSOR Processor
processor 30 3/16 processor CLAIMED PROCESSOR Processor
processor 31 3/17 processor CLAIMED PROCESSOR Processor
"print_manifest" also reports 32 processors:
System Hardware
Model: 9000/800/rp8420
Main Memory: 98253 MB
Processors: 32
OS mode: 64 bit
However, sar and vmstat only show metrics for 16 processors. Here is one sample of "sar -AM 5 999" output:
HP-UX myhostname B.11.11 U 9000/800 10/18/22
09:57:02 cpu %usr %sys %wio %idle
device %busy avque r+w/s blks/s avwait avserv
cpu runq-sz %runocc swpq-sz %swpocc
bread/s lread/s %rcache bwrit/s lwrit/s %wcache pread/s pwrit/s
swpin/s bswin/s swpot/s bswot/s pswch/s
scall/s sread/s swrit/s fork/s exec/s rchar/s wchar/s
iget/s namei/s dirbk/s
rawch/s canch/s outch/s rcvin/s xmtin/s mdmin/s
text-sz ov proc-sz ov inod-sz ov file-sz ov
msg/s sema/s
09:57:07 0 1 1 0 98
2 0 1 0 99
4 0 1 0 99
6 0 0 0 99
8 5 7 3 85
10 0 0 0 100
12 0 1 0 98
14 0 0 0 100
16 0 1 0 99
18 0 1 0 99
20 0 1 1 98
22 1 23 1 75
24 2 1 5 92
26 1 1 0 98
28 1 3 0 96
30 0 2 2 96
system 1 3 1 96
c2t6d0 11.53 0.52 25 451 0.15 9.78
c6t6d0 0.80 0.50 2 13 0.00 6.41
c4t6d0 0.20 0.50 1 10 0.00 3.88
c0t6d0 6.96 0.50 20 430 0.04 5.58
0 0.0 0
2 0.0 0
4 0.0 0
6 0.0 0
8 0.0 0
10 0.0 0
12 0.0 0
14 0.0 0
16 0.0 0
18 0.0 0
20 0.0 0
22 0.0 0
24 0.0 0
26 0.0 0
28 0.0 0
30 0.0 0
system 0.0 0 0.0 0
0 3905 100 28 554 95 0 0
0.00 0.0 0.00 0.0 1626
30148 1255 523 17.30 17.10 32274932 266891
3 858 0
0 0 0 0 0 0
N/A N/A 228/4096 0 2850/63488 0 2294/63498 0
0.00 0.00
and one "vmstat -n 5 999" sample:
VM
memory page faults
avm free re at pi po fr de sr in sy cs
597036 17716240 400 82 0 0 0 0 0 11492 24999 2531
CPU
cpu procs
us sy id r b w
6 4 90 1 0 0
4 3 93
4 3 93
4 3 93
5 3 92
5 3 92
3 3 93
3 3 94
5 3 92
5 3 91
5 3 91
5 3 92
5 5 90
6 5 89
8 5 86
8 5 87
It is interesting to note that "mpsched -s" also shows only 16 processors, however, the IDs shown are all even numbers and correspond to the (I presume) processor IDs shown by sar. Here th "mpsched -s" output:
System Configuration
=====================
Locality Domain Count: 1
Processor Count : 16
Domain Processors
------ ----------
0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
Clearly I am missing some key fact about this system. Can someone explain this discrepancy?
Unfortunately glance is not installed on this system.
Robert Urban
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тАО02-23-2023 03:17 AM
тАО02-23-2023 03:17 AM
Re: Why do ioscan and sar/vmstat report different number of processors?
hello,
I has been years since I've worked on PA-RISC servers , but if I recall correctly the CPU in a RP8420 are PA-8800 and they are dual core ( wikipedia link )
as there can be 4 Cpu per cell , and up to 4 cells in a RP84x0 ; that makes 16 CPUs, but 32 cores.
so iostat reports the cores, but (iirc) SAR/vmstat only report the CPUS, as the two core in a CPU share the cache and bandwith on the same die..
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тАО02-23-2023 08:28 AM
тАО02-23-2023 08:28 AM
Re: Why do ioscan and sar/vmstat report different number of processors?
It is also a long time for me since looking at this sort of thing on a PA-RISC system, but I thought sar just thought of CPUs as "run queues" and I would have expcted it to see 32 if I'm honest. I do seem to recall if you set things up in an odd way from a partitioning perspective, things could look a bit odd from the OS, but we don't have all the information for that. It would be interesting to see the output of commands to show us the configuration of any nPars, vPars or even processor sets on this system:
parstatus
vparstatus
psrset
outputs would be interesting to see.
I am an HPE Employee
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