[Sks-devel] SKS Performance oddity

[Jeremy T. Bouse]

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        I don't know what is going on here with my cluster but I have 3 of 4
nodes that absolutely perform as I would expect... They have 2 vCPU
with 4GB RAM each along with an extra 50GB drive exclusively for SKS
use under /var/lib/sks. The three behaving fine are my sks02, sks03
and sks04 secondary nodes. My primary node on the other hand is
another story. First I tried increasing it from 2 vCPU/4GB RAM like
the others to 2 vCPU/8GB RAM and then 4 vCPU/8GB RAM without it making
any change. I then built out a new physical server with a quad-core
Xeon 2.4GHz processor and 4GB RAM and a dedicated 3TB RAID5 array and
I'm seeing the same problem. SKS is constantly pegging the CPU at 100%
and eating up nearly all the memory whether it's running on a virtual
or physical. server. Recon service is working and I'm ingesting keys
from peers and peering with my internal cluster nodes but everytime it
goes into recon mode the node starts failing to respond as the CPU and
RAM spike which then leads to the node being dropped from the pool as
the stats page can't be hit before it times out.

        I've been fighting with this for a several days now... Anyone else
out there seeing this behavior or if not and have similar resourced
servers care to share details to see if I'm missing something here.

        The particulars are that all nodes are Debian 9.8 (Stretch) 64-bit.
Then only primary node handles running NGINX configured for load
balancing the cluster. The only other daemons running across all nodes
besides SKS are OpenSSH for remote access, SSSD for centralized
authenication, Haveged for entropy and Postfix configured for
smarthost relaying.
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