Re: CPU VP Issue
Thread continues a discussion of CPU VP tuning: a server shows threads on the ready queue despite high OS idle time (>60%) and near-zero wait I/O, suggesting CPU VPs aren't getting scheduled. Suggestions included VPCLASS cpu,num=4,noage,aff=0-3 (affinity and noage), using a separate NET poll thread (NETTYPE onsoctcp,1,600,NET) instead of inline polling, and FASTPOLL 1, explained as a single "anyone got work?" poll rather than asking each connection in turn — said to help most on HP. FASTPOLL was noted as available since IDS 10.xC5. No confirmation that the original problem was fixed is recorded.
Auto-generated by DrWatson from the posts below — may be imperfect; read the full thread.
Try the following onconfig changes...
VPCLASS cpu,num=4,noage,aff=0-3
This will turn on noage and affinity for your 4 cpu vps
NETTYPE onsoctcp,1,600,NET
FASTPOLL 1Try using a NET VP instead of inline polling. This assume you do have
some cpu bandwidth to allow the NET VP some cpu time. A single NET VP
can handle up to 600 connections. If you have more than this, you
might need a 2nd vp.
On May 17, 9:45 am, "Paul Watson (Oninit)" <p...@oninit.com> wrote:
> [cutting]
>
>
>
> >>>> This sparks the age-old debate: add more CPU VPs than physical
> >>>> processor cores? Or is there something incorrectly configured about
> >>>> the _current_ setup that's causing my CPU VPs to do less than they
> >>>> should / yield too easily, etc.?
>
> >> Seen the same thing on HP when you get to larger number of procesors,
> >> larger IDS ready queues but low OS CPU usage. Put it down to a OS bug
>
> >> Cheers
> >> Paul
>
> > RAM vs SWAP vs IDS memory?
>
> 48GB vs 48GB vs 12GB
>
> Cheers
> Paul
pokeyman76@yahoo.com wrote:
> VPCLASS cpu,num=4,noage,aff=0-3
> This will turn on noage and affinity for your 4 cpu vps
>
> NETTYPE onsoctcp,1,600,NET
> FASTPOLL 1
I've seen stuff on FASTPOLL, but have no idea what it does. We're still
considering turning on affinity.
Madison Pruet wrote:
> If the system is showing idle time, and you have threads sitting in the
> ready queue, then there is somthing which is preventing the cpuvp from
> getting scheduled by the OS. What is the wait IO time? What does top
> look like?
That's my understanding, but I can't find any evidence of this. As I
said, idle time runs high (>60%), and wio is always < 1%. This is why I
can't reconcile the ready queue with the high idle time. Although, to
be fair, there are rarely more than about a dozen threads on the ready
queue. Still, if idle time is that high, I wouldn't expect to see much
of ANYTHING on the ready queue.
tgirsch said:
> pokeyman76@yahoo.com wrote:
> > VPCLASS cpu,num=4,noage,aff=0-3
> > This will turn on noage and affinity for your 4 cpu vps
> >
> > NETTYPE onsoctcp,1,600,NET
> > FASTPOLL 1>
> I've seen stuff on FASTPOLL, but have no idea what it does. We're still
> considering turning on affinity.
The executive summary, as explained to a slow clown was this:
Current polling technology asks connection 1, "Have you got anything for
me to do?" Current polling technology asks connection 2, "Have you got
anything for me to do?" Current polling technology asks connection 3,
"Have you got anything for me to do?" Current polling technology asks
connection 4, "Have you got anything for me to do?" Current polling
technology asks connection 5, "Have you got anything for me to do?"
Current polling technology asks connection 6, "Have you got anything for
me to do?" ... Current polling technology asks connection N, "Have you got
anything for me to do?" Then it starts all over again.
Whereas FASTPOLL asks: "Has anyone got anything for me to do? Has anyone
got anything for me to do? Has anyone got anything for me to do? Has
anyone got anything for me to do? Has anyone got anything for me to do?
Has anyone got anything for me to do? Has anyone got anything for me to
do? Has anyone got anything for me to do? Has anyone got anything for me
to do? Has anyone got anything for me to do? Has anyone got anything for
me to do? Has anyone got anything for me to do? ..."
On HP, it apparently is like free money (because HP's polling libraries
are shit.) On other platforms it's still worth doing, but not as
impressive.
--
Bye now,
Obnoxio
"There were a myriad of problems which conspired to corrupt your reason
and rob you of your common sense. Fear got the best of you, and in your
panic you turned to the Labour Party. They promised you order, they
promised you peace, and all they demanded in return was your silent,
obedient consent."
"Obnoxio The Clown" <obnoxio@serendipita.com> wrote in message
news:mailman.1140.1211265848.20610.informix-list@iiug.org...
>
> tgirsch said:
>> pokeyman76@yahoo.com wrote:
>> > VPCLASS cpu,num=4,noage,aff=0-3
>> > This will turn on noage and affinity for your 4 cpu vps
>> >
>> > NETTYPE onsoctcp,1,600,NET
>> > FASTPOLL 1>>
>> I've seen stuff on FASTPOLL, but have no idea what it does. We're still
>> considering turning on affinity.
>
> The executive summary, as explained to a slow clown was this:
>
....
> On HP, it apparently is like free money (because HP's polling libraries
> are shit.) On other platforms it's still worth doing, but not as
> impressive.
Is this true for 10 as well as 11?
Neil Truby wrote:
> "Obnoxio The Clown" <obnoxio@serendipita.com> wrote in message
> news:mailman.1140.1211265848.20610.informix-list@iiug.org...
>
>> tgirsch said:
>>
>>> pokeyman76@yahoo.com wrote:
>>> > VPCLASS cpu,num=4,noage,aff=0-3
>>> > This will turn on noage and affinity for your 4 cpu vps
>>> >
>>> > NETTYPE onsoctcp,1,600,NET
>>> > FASTPOLL 1>>>
>>> I've seen stuff on FASTPOLL, but have no idea what it does. We're still
>>> considering turning on affinity.
>>>
>> The executive summary, as explained to a slow clown was this:
>>
>>
> ....
>
>> On HP, it apparently is like free money (because HP's polling libraries
>> are shit.) On other platforms it's still worth doing, but not as
>> impressive.
>>
>
> Is this true for 10 as well as 11?
>
Is FASTPOLL supported on 10? I'm currently running on severely degraded
hardware, which means I can't be arsed to spend 15 minutes firing up a
browser to check. If it's documented for 10, it's worth a punt. If it
works, you owe me beer. :o)
On 20 май, 09:04, "Neil Truby" <neil.tr...@ardenta.com> wrote: > "Obnoxio The Clown" <obno...@serendipita.com> wrote in messagenews:mailman.1140.1211265848.20610.informix-list@iiug.org... > > tgirsch said: > >> pokeyma...@yahoo.com wrote: > >> > VPCLASS cpu,num=4,noage,aff=0-3 > >> > This will turn on noage and affinity for your 4 cpu vps > > >> > NETTYPE onsoctcp,1,600,NET > >> > FASTPOLL 1 > > >> I've seen stuff on FASTPOLL, but have no idea what it does. We're still > >> considering turning on affinity. > > > The executive summary, as explained to a slow clown was this: > > .... > > On HP, it apparently is like free money (because HP's polling libraries > > are shit.) On other platforms it's still worth doing, but not as > > impressive. > > Is this true for 10 as well as 11?- Скрыть цитируемый текст - Since IDS 10.xC5