High memory and high cpu usage on Wordpress application hosted on azure web app

Question

High memory and high cpu usage on Wordpress application hosted on azure web app

kuldeep Singh 25

Hi Team, we are using wordpress application hosted on azure web app, am experiencing issue of high cpu and high memory, can some pls suggest how to resolve it.

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND

root 562 3.9 6.5 600812 531928 ? SN Mar18 368:14 unison /home/site/wwwroot /var/www/wordpress -auto -batch -times -copythresh

nginx 166415 1.7 2.0 772780 168336 ? SN 07:19 0:34 php-fpm: pool www

nginx 166413 1.6 2.0 769816 164900 ? SN 07:19 0:32 php-fpm: pool www

nginx 166406 1.6 2.0 772416 168676 ? SN 07:19 0:32 php-fpm: pool www

nginx 166396 1.6 2.3 791192 187316 ? SN 07:19 0:32 php-fpm: pool www

nginx 166412 1.6 2.3 792168 187656 ? SN 07:19 0:32 php-fpm: pool www

nginx 166411 1.5 2.1 778128 173484 ? SN 07:19 0:31 php-fpm: pool www

nginx 166407 1.5 2.1 774260 170600 ? SN 07:19 0:30 php-fpm: pool www

nginx 166417 1.5 2.3 791376 188228 ? RN 07:19 0:30 php-fpm: pool www

nginx 166410 1.5 2.1 780208 176428 ? SN 07:19 0:29 php-fpm: pool www

nginx 166414 1.4 2.3 792232 188452 ? SN 07:19 0:29 php-fpm: pool www

nginx 166409 1.4 2.0 771468 166448 ? SN 07:19 0:29 php-fpm: pool www

nginx 144671 1.4 2.1 775344 174284 ? SN 06:57 0:49 php-fpm: pool www

nginx 149061 1.4 2.1 778076 174052 ? SN 07:01 0:43 php-fpm: pool www

nginx 166402 1.3 2.1 776192 172756 ? SN 07:19 0:27 php-fpm: pool www

nginx 166401 1.3 2.0 769952 166032 ? SN 07:19 0:27 php-fpm: pool www

nginx 166416 1.3 2.0 771912 166392 ? SN 07:19 0:25 php-fpm: pool www

nginx 144597 1.3 2.1 772536 172328 ? SN 06:57 0:43 php-fpm: pool www

nginx 152700 1.3 2.1 774756 169944 ? SN 07:05 0:36 php-fpm: pool www

nginx 166408 1.2 2.0 769816 165592 ? SN 07:19 0:25 php-fpm: pool www

nginx 76335 1.2 2.4 796164 200948 ? SN 05:54 1:30 php-fpm: pool www

nginx 163543 1.2 2.1 778252 173676 ? SN 07:16 0:27 php-fpm: pool www

nginx 151754 1.2 2.3 796352 191692 ? SN 07:04 0:36 php-fpm: pool www

nginx 149045 1.2 2.0 772620 169228 ? SN 07:01 0:38 php-fpm: pool www

nginx 147697 1.2 2.0 769824 168468 ? SN 07:00 0:39 php-fpm: pool www

nginx 61457 1.2 2.1 772284 177156 ? SN 05:41 1:37 php-fpm: pool www

nginx 59978 1.2 2.4 793332 195492 ? SN 05:41 1:38 php-fpm: pool www

nginx 148159 1.2 2.1 772164 170736 ? SN 07:00 0:38 php-fpm: pool www

nginx 145120 1.2 2.2 780448 179700 ? SN 06:57 0:39 php-fpm: pool www

nginx 142909 1.1 2.3 794936 190868 ? SN 06:55 0:40 php-fpm: pool www

nginx 148805 1.1 2.1 782488 177324 ? SN 07:01 0:35 php-fpm: pool www

nginx 61289 1.1 2.3 781528 187044 ? SN 05:41 1:29 php-fpm: pool www

nginx 150224 1.1 2.0 770296 168572 ? SN 07:03 0:33 php-fpm: pool www

nginx 145242 1.1 2.0 772020 167228 ? SN 06:57 0:37 php-fpm: pool www

nginx 142121 1.1 2.1 780560 176248 ? SN 06:54 0:39 php-fpm: pool www

nginx 75700 1.0 2.4 791156 194344 ? SN 05:53 1:16 php-fpm: pool www

Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-26T10:30:26.6333333+00:00
Hi kuldeep Singh,
In an Azure-hosted WordPress application, Excessive CPU and Memory usage could be due to, check Resource Consumption Use Perfin sights or Azure monitoring tools to analyze CPU and memory usage. This can also assist you identify which process is consuming more resources.

In your process list shared above, the php-fpm processes use a lot of CPU and memory. Investigate the scripts or plugins which may be utilizing too many resources.

When it is about first improving your WordPress app you should:

Turning off unused plugins.

Reducing server load using a caching plugin

Images and media files optimization.

If your application always needs more resources, scale to a higher-tier service on Azure where more CPU and memory can be made available.

Your application may be using a high CPU due to inefficient code or bad loops. Take a look at your code if you may have extra optimizations to perform

Sudden increases in traffic can increase resource consumption. Analyze traffic patterns using Azure’s monitoring tools and load balance if needed.

If your WordPress setup requires too much from the database, make sure that the database is optimized. Tools to analyze and optimize your queries.

https://learn.microsoft.com/en-us/troubleshoot/azure/app-service/web-apps-performance-faqs#application-performance-faqs-for-web-apps-in-azure
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/azure-windows-vm-memory-issue#troubleshoot-memory-pressure-issues
if you have any further concerns or queries, please feel free to reach out to us.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-27T08:54:56.42+00:00

Hi kuldeep Singh,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution.

please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
kuldeep Singh 25 Reputation points

2025-03-27T11:15:40.3466667+00:00

ihave noticed that unison-fsmonito is running on the wordpress-app web app, consuming high memory. can you pls help me is this required by default or i can remove it. as per diagnose setting, it is consuming 8% memory
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-27T11:25:54.51+00:00

Hi kuldeep Singh,

The Unison-FSMONITOR Unison file is part of the synchronizer which is used for file synchronization in some environment.

It is usually used in Linux containers or azure app services running on the atmosphere where local files need to be synchronized between several examples.

However, for a specific WordPress application hosted on the Azure web app, Unison-FSMONITOR does not require unless you have a specific setup, which requires file synchronization in examples.

If you’re not using any file synchronization functionality, it’s safe to disable or remove the unison-fsmonitor process.

Ensure that unnecessary services or processes are disabled to prevent high resource consumption.

Review WordPress plugins, themes, and configurations that might be contributing to excessive memory and CPU usage.
kuldeep Singh 25 Reputation points

2025-03-27T12:02:36.0333333+00:00

am not able to remove it from web app, can you share the way to remove it from web app.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-27T14:22:27.3266667+00:00

Hi kuldeep Singh,
If confirmed that it's unnecessary, you can stop or disable the unison-fsmonitor process via startup Command

Add a startup command to stop the process

In the Azure portal, navigate your app service in that select configuration from left panel->click on normal settings and scroll down for the startup command.

pkill -f unison-fsmonitor

Verify that the process is disabled, Reach your web app using SSH or Kudu.

ps aux | grep unison

These commands may help ful to you
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-28T08:41:41.1066667+00:00

Hikuldeep Singh, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution.

please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-31T08:36:42.7966667+00:00

Hikuldeep Singh, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution.

please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
kuldeep Singh 25 Reputation points

2025-04-01T11:12:59.16+00:00

@Alekhya Vaddepally (Quadrant Resource) @Alekhya Vaddepally once i Restart the web app, unsion start again, its not getting removed.

1 answer

Your answer

Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-26T10:30:26.6333333+00:00

Hi kuldeep Singh,
In an Azure-hosted WordPress application, Excessive CPU and Memory usage could be due to, check Resource Consumption Use Perfin sights or Azure monitoring tools to analyze CPU and memory usage. This can also assist you identify which process is consuming more resources.

In your process list shared above, the php-fpm processes use a lot of CPU and memory. Investigate the scripts or plugins which may be utilizing too many resources.

When it is about first improving your WordPress app you should:

Turning off unused plugins.

Reducing server load using a caching plugin

Images and media files optimization.

If your application always needs more resources, scale to a higher-tier service on Azure where more CPU and memory can be made available.

Your application may be using a high CPU due to inefficient code or bad loops. Take a look at your code if you may have extra optimizations to perform

Sudden increases in traffic can increase resource consumption. Analyze traffic patterns using Azure’s monitoring tools and load balance if needed.

If your WordPress setup requires too much from the database, make sure that the database is optimized. Tools to analyze and optimize your queries.

https://learn.microsoft.com/en-us/troubleshoot/azure/app-service/web-apps-performance-faqs#application-performance-faqs-for-web-apps-in-azure
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/azure-windows-vm-memory-issue#troubleshoot-memory-pressure-issues
if you have any further concerns or queries, please feel free to reach out to us.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-27T08:54:56.42+00:00

Hi kuldeep Singh,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution.

please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
kuldeep Singh 25 Reputation points

2025-03-27T11:15:40.3466667+00:00

ihave noticed that unison-fsmonito is running on the wordpress-app web app, consuming high memory. can you pls help me is this required by default or i can remove it. as per diagnose setting, it is consuming 8% memory
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-27T11:25:54.51+00:00

Hi kuldeep Singh,

The Unison-FSMONITOR Unison file is part of the synchronizer which is used for file synchronization in some environment.

It is usually used in Linux containers or azure app services running on the atmosphere where local files need to be synchronized between several examples.

However, for a specific WordPress application hosted on the Azure web app, Unison-FSMONITOR does not require unless you have a specific setup, which requires file synchronization in examples.

If you’re not using any file synchronization functionality, it’s safe to disable or remove the unison-fsmonitor process.

Ensure that unnecessary services or processes are disabled to prevent high resource consumption.

Review WordPress plugins, themes, and configurations that might be contributing to excessive memory and CPU usage.
kuldeep Singh 25 Reputation points

2025-03-27T12:02:36.0333333+00:00

am not able to remove it from web app, can you share the way to remove it from web app.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-27T14:22:27.3266667+00:00

Hi kuldeep Singh,
If confirmed that it's unnecessary, you can stop or disable the unison-fsmonitor process via startup Command

Add a startup command to stop the process

In the Azure portal, navigate your app service in that select configuration from left panel->click on normal settings and scroll down for the startup command.

pkill -f unison-fsmonitor

Verify that the process is disabled, Reach your web app using SSH or Kudu.

ps aux | grep unison

These commands may help ful to you
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-28T08:41:41.1066667+00:00

Hikuldeep Singh, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution.

please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Alekhya Vaddepally 1,670 Reputation points Microsoft External Staff Moderator

2025-03-31T08:36:42.7966667+00:00

Hikuldeep Singh, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution.

please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
kuldeep Singh 25 Reputation points

2025-04-01T11:12:59.16+00:00

@Alekhya Vaddepally (Quadrant Resource) @Alekhya Vaddepally once i Restart the web app, unsion start again, its not getting removed.

Answer 1

Hi kuldeep Singh,
It seems that whenever your web app is restarted, the Unison-FSMonitor is starting automatically. This is because this process is being triggered by the service, script or default startup behavior of the environment. Since the Pkill command only eliminates the process on the runtime, it does not prevent re -launch after the restart.

To disable permanently unison-FSMONITOR from re-starting, you need to modify the startup configuration of your Azure App service.

Instead of running only Pkill -F Unison -FSmonitor, you should add a continuous mechanism to stop it. Update your startup command to include the following:

#!/bin/bash

pkill -f unison-fsmonitor

while true; do pkill -f unison-fsmonitor; sleep 10; done &

steps to update the startup command in Azure go to azure portal, Open your app service ->Click on the configuration (from the left panel)->Scroll down for a startup command,Enter the script above and save

if you installed as service remove unison-fsmonitor from Auto-Startup,If the issue persists, it might be that unison-fsmonitor is registered as a service. You can check and disable it using SSH/Kudu:

systemctl disable unison-fsmonitor

systemctl stop unison-fsmonitor

make sure you restart the web apps

Use SSH/Kudu to confirm the process is no longer running:

ps aux | grep unison

If nothing appears, it’s successfully removed.

https://learn.microsoft.com/en-us/azure/app-service/configure-custom-container?pivots=container-linux&tabs=debian#custom-startup-command
https://learn.microsoft.com/en-us/azure/app-service/configure-linux-open-ssh-session?pivots=container-linux If the answer is helpful, please click Accept Answer and kindly upvote it so that other people who faces similar issue may get benefitted from it.

Let me know if you have any further Queries.

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High memory and high cpu usage on Wordpress application hosted on azure web app

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