How to display individual CPU load using 'top' on a multiprocessor node?
Solaris 10 supports multiprocessor system. Let's say I have 2 CPUs. How can I know the load of each of the 2 CPUs by using the 'top' command?
On Linux, after you invoke 'top' you can press 1 to toggle between the combined-CPU-load setting and 'individual-CPU-load' setting. But it appears that 'top' on Solaris shows only the combined CPU load. Is there a way to show how much % CPU1 is busy and how much % CPU2 is busy, etc?
If I run on a dual processor dual core AMD Opteron node, i.e. 4 CPUs in total. How do I know which two CPUs reside on one processor, and which two on the other processor? That is, how do I know CPU1 and CPU4 are the two cores on the same processors, for example? On Linux, one can tell from /proc/cpuinfo.
[760 byte] By [
minglai] at [2007-11-26 8:54:20]
# 3
You are right. For others who are interested:
% /usr/sbin/psrinfo -pv
The physical processor has 2 virtual processors (0, 2)
x86 (chipid 0x0 AuthenticAMD family 15 model 33 step 2 clock 2000 MHz)
AMD Opteron(tm) Processor 270
The physical processor has 2 virtual processors (1, 3)
x86 (chipid 0x1 AuthenticAMD family 15 model 33 step 2 clock 2000 MHz)
AMD Opteron(tm) Processor 270
This is a HP ProLiant BL35p G1 with 2 physical processors each of which has dual cores. According to this, CPUs 0 and 2 are two cores on one processor, and CPUs 1 and 3 are the other 2 cores on another processor. Thanks. But I feel the term "virtual processor" in the output is somewhat misleading - in the presence of hyperthreading technology. The dual cores are real physical cores, they are not "virtual". I know AMD does not use hyperthreading technology for now, but who knows in the future? The term "virtual processors" make people wonder whether they are "virtual processors" as a result of some hyperthreading technology or real physical cores.
And for completeness, here is the output of 'psrinfo -v' :
% /usr/sbin/psrinfo -v
Status of virtual processor 0 as of: 07/20/2006 10:47:26
on-line since 07/05/2006 10:38:08.
The i386 processor operates at 2000 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 1 as of: 07/20/2006 10:47:26
on-line since 07/05/2006 10:38:11.
The i386 processor operates at 2000 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 2 as of: 07/20/2006 10:47:26
on-line since 07/05/2006 10:38:13.
The i386 processor operates at 2000 MHz,
and has an i387 compatible floating point processor.
Status of virtual processor 3 as of: 07/20/2006 10:47:26
on-line since 07/05/2006 10:38:15.
The i386 processor operates at 2000 MHz,
and has an i387 compatible floating point processor.
As a comparison, here is the output of 'psrinfo -pv' on a Pentium 4 with hyperthreading enabled:
% /usr/sbin/psrinfo -pv
The physical processor has 2 virtual processors (0, 1)
x86 (chipid 0x0 GenuineIntel family 15 model 4 step 3 clock 2993 MHz)
Intel(r) Pentium(r) 4 CPU 3.00GHz
Here the "virtual processors" are not real physical cores but just virtual processors due to the use of hyperthreading, because I happen to know how the system is really configured.
I hope Solaris would distinguish between virtual processors and cores. If the Solaris developers are reading this, I hope 'psrinfo' in the future would also give info about the cores. And I cannot help but wonder what the output of 'psrinfo -pv' would look like on a dual core processor with hyperthreading enabled.
# 5
You are right again. For Solaris 10:
on a dual-processor with dual-core on each processor (AMD Opteron 270), there are 4 different core id's:
% kstat -m cpu_info | grep core_id
core_id 0
core_id 1
core_id 2
core_id 3
on a uni-core uni-processor with hyperthreading (Pentium 4), there is only 1 cored id:
% kstat -m cpu_info | grep core_id
core_id 0
core_id 0
And there is a 'chip_id' field in the kstat output which helps tell the processor setup. 'chip_id', 'core_id' and CPU id together should tell whether there are multiple processors/cores and hyperthreading. Thanks.
