Nearly Random, Uncorrelated Server Load Average Spikes Post: 303044133

Sponsored Content

Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044133 by Neo on Friday 14th of February 2020 10:36:43 PM

02-14-2020

Administrator

Update:

Two more spikes over the course of the past 12 hours, none of which show any correlation to an increase the number of bots; however, that does not say anything about the velocity of bots hitting the site. However, there is no correlation (over the last 12 hours and with two spikes recorded) with an increased overall number of bots. In addition, there is no correlation to increase network I/0.

The only consistent correlation so far is:

The one minute load average spike.
The increase in the total number of apache2 processes.
The increase in the total percentage of apache2 CPU % recorded.

There is weak, but inconsistent, correlation with:

An increase in the number of bots on the site .
An increase in the overall MySQL CPU percent.

There is no correlation, weak or otherwise to:

An increase in network I/O.
Any application cron activity.
Any system cron activity.
Any system disk I/O errors or anomalies.

So, as a sanity check, I have disabled apache2 mod pagespeed (just now) to see if there is any effect at all.

Code:

<IfModule pagespeed_module>
    # Turn on mod_pagespeed. To completely disable mod_pagespeed, you
    # can set this to "off".
    ModPagespeed off

    ###
    ###

This is just a "shot in the dark" (disabling mod pagespeed), but at least we will know something. If the spikes continue, I will turn it back on, of course.

Neo

View Public Profile for Neo

Visit Neo's homepage!

Find all posts by Neo

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

load average

we have an unix system which has load average normally about 20. but while i am running a particular unix batch which performs heavy operations on filesystem and database average load reduces to 15. how can we explain this situation? while running that batch idle cpu time is about %60-65...

2. UNIX for Dummies Questions & Answers

Load Average

Hello all, I have a question about load averages. I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but...

3. UNIX for Dummies Questions & Answers

top - Load average

Hello, Here is the output of top command. My understanding here is, the load average 0.03 in last 1 min, 0.02 is in last 5 min, 0.00 is in last 15 min. By seeing this load average, When can we say that, the system load averge is too high? When can we say that, load average is medium/low??...

4. Solaris

load average query.

Hi, i have installed solaris 10 on t-5120 sparc enterprise. I am little surprised to see load average of 2 or around on this OS. when checked with ps command following process is using highest CPU. looks like it is running for long time and does not want to stop, but I do not know...

5. UNIX for Dummies Questions & Answers

Please Help me in my load average

Hello AlL,.. I want from experts to help me as my load average is increased and i dont know where is the problem !! this is my top result : root@a4s # top top - 11:30:38 up 40 min, 1 user, load average: 3.06, 2.49, 4.66 Mem: 8168788k total, 2889596k used, 5279192k free, 47792k...

6. UNIX for Advanced & Expert Users

Load average in UNIX

Hi , I am using 48 CPU sunOS server at my work. The application has facility to check the current load average before starting a new process to control the load. Right now it is configured as 48. So it does mean that each CPU can take maximum one proces and no processe is waiting. ...

7. Solaris

Load Average and Lwps

NPROC USERNAME SWAP RSS MEMORY TIME CPU 320 oracle 23G 22G 69% 582:55:11 85% 47 root 148M 101M 0.3% 99:29:40 0.3% 53 rafmsdb 38M 60M 0.2% 0:46:17 0.1% 1 smmsp 1296K 5440K 0.0% 0:00:08 0.0% 7 daemon ...

8. UNIX for Dummies Questions & Answers

Load average spikes once an hour

Hi, I am getting a high load average, around 7, once an hour. It last for about 4 minutes and makes things fairly unusable for this time. How do I find out what is using this. Looking at top the only thing running at the time is md5sum. I have looked at the crontab and there is nothing...

9. UNIX for Dummies Questions & Answers

Help with load average?

how load average is calculated and what exactly is it difference between cpu% and load average

10. Programming

ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages

Here we go.... Preface: ..... so in a galaxy far, far, far away from commercial, data sharing corporations..... For this project, I used the ESP-WROOM-32 as an MQTT (publish / subscribe) client which receives Linux server "load averages" as messages published as MQTT pub/sub messages....

LEARN ABOUT OPENSOLARIS

mlib_signalautocorrel_f32

mlib_SignalAutoCorrel_S16(3MLIB)			    mediaLib Library Functions				  mlib_SignalAutoCorrel_S16(3MLIB)

NAME

       mlib_SignalAutoCorrel_S16, mlib_SignalAutoCorrel_S16S, mlib_SignalAutoCorrel_F32, mlib_SignalAutoCorrel_F32S - signal auto-correlation

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_SignalAutoCorrel_S16(mlib_d64 *correl,
	    const mlib_s16 *src, mlib_s32 disp, mlib_s32 n);

       mlib_status mlib_SignalAutoCorrel_S16S(mlib_d64 *correl,
	    const mlib_s16 *src, mlib_s32 disp, mlib_s32 n);

       mlib_status mlib_SignalAutoCorrel_F32(mlib_d64 *correl,
	    const mlib_f32 *src, mlib_s32 disp, mlib_s32 n);

       mlib_status mlib_SignalAutoCorrel_F32S(mlib_d64 *correl,
	    const mlib_f32 *src, mlib_s32 disp, mlib_s32 n);

DESCRIPTION

       Each of these functions performs auto-correlation.

       For monaural signals, the following equation is used:

		       1    n-d-1
	 correl[0] = ----- * SUM (src[i] * src[i + d])
		     n - d   i=0

       For stereo signals, the following equation is used:

		       1    n-d-1
	 correl[0] = ----- * SUM (src[2*i] * src[2*(i + d)])
		     n - d   i=0

		       1    n-d-1
	 correl[1] = ----- * SUM (src[2*i + 1] * src[2*(i + d) + 1])
		     n - d   i=0

       where d = disp.

PARAMETERS

       Each of the functions takes the following arguments:

       correl	 Pointer to the auto-correlation array. In the stereo version, correl[0] contains the auto-correlation of channel 0, and correl[1]
		 contains the auto-correlation of channel 1.

       src	 Source signal array.

       disp	 Displacement. 0 <= disp < n.

       n	 Number of samples in the source signal array.

RETURN VALUES

       Each of the functions returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_SignalCrossCorrel_S16(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					  mlib_SignalAutoCorrel_S16(3MLIB)

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

load average

Discussion started by: gfhgfnhhn

2. UNIX for Dummies Questions & Answers

Load Average

Discussion started by: Heathe_Kyle

3. UNIX for Dummies Questions & Answers

top - Load average

Discussion started by: govindts

4. Solaris

load average query.

Discussion started by: upengan78