sysconf - number of processors

[jprabaker]

Hi,

We are trying to to install some ODBC drivers on to an LPAR on a 670 (AIX 5200-03). The install goes off and uses the sysconf _SC_NPROCESSORS_CONF routine to determine the number of processors. However, it is getting back a value of 4, when the LPAR only has 2 processors. I've checked and the 670 has a total 4 processors, but the partition has 2 assigned and available.

Any thoughts? The installation fails and I'm a bit stuck!

thanks,
John

 

[ogniemi]

maybe you should remove all defined cpu's - leave only available in the system.

# lsdev -Cc processor
proc0 Available 00-00 Processor
proc1 Available 00-01 Processor

 

[jprabaker]

Thanks for the responses.

The _SC_NPROCESSORS_CONF value returns the total number of CPUs in the machine. On a partitioned system is displays the total for the managed system not the partition. The _SC_NPROCESSORS_ONLN value for sysconf shows the number of "active" CPUs.

John

 

[jprabaker]

Interestingly; AIX 5.1 reports the same for both values, 5.2 doesn't! Perhaps a feature of 5.2?