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Re: [pcp] pmclusterd versus other solutions

To: Jeff Hanson <jhanson@xxxxxxx>
Subject: Re: [pcp] pmclusterd versus other solutions
From: Mark Goodwin <mgoodwin@xxxxxxxxxx>
Date: Mon, 12 Sep 2016 14:31:34 +1000
Cc: PCP <pcp@xxxxxxxxxxx>
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <CAFmffyUkbMi1g3XScEE-XjEHBmdbd5WvHZ6UpGKN_eZtG6pm=g@xxxxxxxxxxxxxx>
References: <3b551b84-ff74-5b9c-5854-3bdcba1c1212@xxxxxxx> <CAFmffyUkbMi1g3XScEE-XjEHBmdbd5WvHZ6UpGKN_eZtG6pm=g@xxxxxxxxxxxxxx>
> But the real problem is that although pmclusterd exposes some 100 metrics or
> so but only 20 of them are actually able to be fetched.

Jeff, do you ever see "cluster_node_rw: spinning" in either
/var/log/pcp/pmcd/cluster.log or /var/log/pcp/pmclusterd.log ?
Can you send me these logs after reproducing the issue where only some
(20 out of 100) metrics can be fetched but the others report the
instance domain issue?

Thanks
-- Mark

On Thu, Sep 1, 2016 at 3:59 PM, Mark Goodwin <mgoodwin@xxxxxxxxxx> wrote:
> Hi Jeff, I don't think we ever open-sourced pmclusterd since it was
> (at the time) SGI ICE specific,
> so it's unlikely anyone outside SGI will know much about it.
>
> This is the daemon that aggregates indoms for per-cluster-node CPU
> data on the head node, so
> the client tools just monitor the head node, right? If that's the tool
> framework you're referring to,
> I always thought it was a bit of an abomination of the indom concept
> (even though I wrote it!),
> but designed it that way to be more scalable than monitoring every
> cluster node individually.
> WHat issues are you running in to?
>
> Regards
> -- Mark
>
>
> On Thu, Sep 1, 2016 at 2:43 AM, Jeff Hanson <jhanson@xxxxxxx> wrote:
>> As we (SGI) explore what to do about the scaling issues with pmclusterd
>> as it is currently written I am exploring other options.  For cluster
>> configurations are people generally running pmcd locally on the cluster
>> nodes
>> and logging to the node?  Running pmcd locally on the cluster node with
>> another system as the logger?  Other thoughts?
>>
>> Thanks.
>> --
>> -----------------------------------------------------------------------
>> Jeff Hanson - jhanson@xxxxxxx - Senior Technical Support Engineer
>>
>> You can choose a ready guide in some celestial voice.
>> If you choose not to decide, you still have made a choice.
>> You can choose from phantom fears and kindness that can kill;
>> I will choose a path that's clear
>> I will choose freewill. - Peart
>>
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