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Full Discussion: Nearly Random, Uncorrelated Server Load Average Spikes
Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044122 by Neo on Friday 14th of February 2020 08:22:50 AM
Old 02-14-2020
Looks like it was "bot related"

TImeline from my MQTT instrumentation logged in the DB:
  • 1581684184 Bot activity starts to peak
  • 1581684491 . Apache process and CPU% begin to spike
  • 1581684491 . Load1 average spikes
  • 1581684511 Single mysql slow_query_log entry (coincidental?) , 11+ second query:
  • Code:
    use unixmanpages; SET timestamp=1581684511;select os, token, query, manid,formatted,MATCH(text) AGAINST ('Arduino Project with NB-IoT (3GPP) and LoRa / LoRaWAN' IN NATURAL LANGUAGE MODE) as score,strlen FROM neo_man_page_entry where strlen > 2000 AND strlen < 1000000 ORDER BY score DESC limit 3, 1;

  • 1581684542 . Application PHP cron (LAMP process) kicks of an "Hourly Cleanup2" process (coincidental?)
  • 1581684606 . One minute load average now half of peak during spike and all in recovery mode.

So, if the next spike has a similar correlation to Apache2 processes and bots, I will build some "count which bots from who" instrumentation so see if we can find out "which bots are causing the problem"... but before I build instrumentation for that, let's see what happens during the next spike hit.

As I recall, this could be an issue with any number of bots (if this is indeed the cause), including Chinese bots, Korean bots, etc. However, I have seen Bingbot also cause similar issues before.

Yea! I have that "warm feeling" which comes from closing in on solving a mystery!

But on the other hand, I am not sure if the spike in Apache2 processes is a cause or an effect, because if the site slows down (for some reason), I think the Apache2 processes can take longer to change state and they could spike as an effect and not a cause.. Hopefully, will get this all figured out soon.

Note: If I execute the "slow query" above, now, that query takes one second. So the SQL query above is more-than-likely a coincidental effect.
This User Gave Thanks to Neo For This Post:
vgersh99
 

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