[ClusterLabs] Syncing data and reducing CPU utilization of cib process

[Nikhil Utane]

Thank you Lars. Yes, subscribing will be better. Will look into it.
We have already started working on reducing the data that goes into CIB
file.

-Regards
Nikhil

On Mon, Apr 3, 2017 at 6:41 PM, Lars Ellenberg <lars.ellenberg at linbit.com>
wrote:

> On Mon, Apr 03, 2017 at 03:44:21PM +0530, Nikhil Utane wrote:
> > Here's the snapshot. As seen below, the messages are coming at more than
> a
> > second frequency.
> > I checked that the cib.xml file was not updated (no change to timestamp
> of
> > file)
> > Then i took tcpdump and did not see any message other than keep-alives.
> > Is the cib process looping incorrectly?
> > Can share strace output if required.
> >
> > Apr 03 14:48:28 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13559 (ratio 31:1ms
> > Apr 03 14:48:29 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13536 (ratio 31:1ms
> > Apr 03 14:48:29 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13551 (ratio 31:1ms
> > Apr 03 14:48:30 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13552 (ratio 31:1ms
> > Apr 03 14:48:31 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13537 (ratio 31:1ms
> > Apr 03 14:48:32 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13534 (ratio 31:1ms
> > Apr 03 14:48:32 [6372] 0005B932ED72        cib:     info:
> > crm_compress_string:  Compressed 427943 bytes into 13546 (ratio 31:1ms
>
> Each and every "cibadmin -Q" (or equivalent) will trigger that,
> also for local IPC.
>
> Stop polling the cib several times per seconds.
>
> If you have to, "subscribe" to cib updates, using the API.
>
> And stop pushing that much data into the cib.
> Maybe, as a stop gap, compress it yourself,
> before you stuff it into the cib.
>
>
> --
> : Lars Ellenberg
> : LINBIT | Keeping the Digital World Running
> : DRBD -- Heartbeat -- Corosync -- Pacemaker
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