Re: NUMCPU >1 = IEE331A EXCESSIVE DISABLED SPIN LOOP DETECTED

So MVS38j *will* use multiple cpus ?

Or is that Hercules starting the O.S on the multiple cpus?

The turnkey "stock" config has NUMCPU 1,  is that because the multiple
CPU feature didn't exist at the time Turnkey was released, or other
reasons ?

On 5/19/10, Rick Fochtman <[email protected]> wrote:
> --------------------------------<snip>---------------------------------
>
>>
>>
>> Just for fun, I changed the NUMCPU to 2, when I IPL'd Turnkey MVS
>> (actually t33su),
>> the console displayed :
>>
>> IEE331A EXCESSIVE DISABLED SPIN LOOP DETECTED
>> WAITING FOR LOCK RELEASE
>> REPLY U TO CONTINUE SPIN
>> IEF677I WARNING MESSAGE(S) FOR JOB JES2 ISSUED
>>
>> - $HASP493 JES2 QUICK-START IS IN PROGRESS
>>
>> - $HASP412 MAXIMUM OF 1 READER(S) EXCEEDED
>> IEE041I THE SYSTEM LOG IS NOW ACTIVE
>>
>> I *thought* MVS would just ignore the second CPU, but apparently it
>> doesn't ... but it doesn't seem to utilize it "properly" either ?
>>
> ------------------------------<unsnip>--------------------------------
> Unless the I/O load exceeds certain user-defined levels, all but one CPU
> runs disabled for I/O interrupts. SPIN locks are used to serialize
> activities between multiple CPU's in the CEC. What you've seen is not at
> all unusual in a multi-processor CEC.
>
> Typically, any processor in the CEC may initiate I/O operations but only
> one fields the resulting interrupts. Helps to control I/O delays to
> processing by limiting interrupts.
>
> Rick
>