Re: [pcp] pmcd gives up on slow starting Perl PMDA

[Martins Innus <minnus@xxxxxxxxxxx>]

On 3/24/14 6:26 AM, Ken McDonell wrote:
> On 24/03/14 12:12, Nathan Scott wrote:
> > The potential problem there is that pmcd might get some client
> > request at an unfortunate time, which might have been quickly
> > satisfied by the PMDA, but could end up telling the client we
> > had a slow PMDA, when in fact we did not.  e.g. I'm thinking of
> > the pmdaproc case here, where a /proc scan may be quick, or it
> > may not.  It may be possible to tackle this using a thread in
> > libpcp_pmda which has a timer, and if the timer is not quickly
> > cancelled then the thread could inform pmcd of the delay as it
> > is happening?
> If I can get the BUSY case to work, then I think we can generalize the 
> pmdaControl method to provide the sort of semantics you're after here.
We have proc pmdas that are timing out on heavily loaded systems, my 
next task was going to be looking into this.  Should I wait until this 
new api/method is fleshed out before doing so?
Thanks

Martins