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Merge pull request #9570 from Icinga/jemalloc-doc 

Recommend to try libjemalloc to speed up reload
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Julian Brost 2022-11-16 12:51:05 +01:00 committed by GitHub
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doc/15-troubleshooting.md
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@ -176,6 +176,60 @@ C:\> cd C:\ProgramData\icinga2\var\log\icinga2
C:\ProgramData\icinga2\var\log\icinga2> Get-Content .\debug.log -tail 10 -wait
```
## Icinga starts/restarts/reloads very slowly
Icinga performs a lot of memory allocations, especially during startup.
Swapping out the allocator may increase the startup performance.
The following instructions assume you run Linux and systemd.
On RHEL or derivates add the EPEL repository first (if not already done).
Let your package manager search for package names containing "jemalloc".
Pick preferably one named "libjemalloc" followed by a number,
just "jemalloc" otherwise, and install it.
Run `ldconfig -p |grep libjemalloc`. It should print something similar to:
```
libjemalloc.so.2 (libc6,x86-64) => /lib/x86_64-linux-gnu/libjemalloc.so.2
```
I.e. a relative file name followed by an absolute one. Remember the latter.
Measure how long Icinga needs to load its config without and with libjemalloc:
```bash
time icinga2 daemon -C
time env LD_PRELOAD=/lib/x86_64-linux-gnu/libjemalloc.so.2 icinga2 daemon -C
```
Replace `/lib/x86_64-linux-gnu/libjemalloc.so.2` with the absolute path
you actually got from `ldconfig -p`!
Please do us a favor and share your results
[with us](https://community.icinga.com/t/icinga-reloads-config-slowly-try-jemalloc/11032).
If it's faster with libjemalloc, do the following to persist the change.
Run `systemctl edit icinga2.service`. This will open an editor.
Add the following, save the file and close the editor.
```
[Service]
Environment=LD_PRELOAD=/lib/x86_64-linux-gnu/libjemalloc.so.2
```
Replace `/lib/x86_64-linux-gnu/libjemalloc.so.2` with the absolute path
you actually got from `ldconfig -p`!
Restart Icinga. Verify whether your changes took effect and enjoy the speed:
```
# lsof -p `cat /var/run/icinga2/icinga2.pid` |grep libjemalloc
icinga2 7764 nagios mem REG 8,5 744776 2631636 /usr/lib/x86_64-linux-gnu/libjemalloc.so.2
#
```
## Configuration Troubleshooting <a id="troubleshooting-configuration"></a>
### List Configuration Objects <a id="troubleshooting-list-configuration-objects"></a>