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Revert "Recommend to try libjemalloc to speed up reload"

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This reverts commit 0230883a51a57074ebe35ee17f70aef69c032e83.
This commit is contained in:
Alexander A. Klimov 2023-05-02 16:55:03 +02:00
parent a65f2d6b41
commit 033d2bf248
1 changed files with 4 additions and 58 deletions
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doc/15-troubleshooting.md
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@ -236,63 +236,9 @@ curl -k -s -S -i -u root:icinga -H 'Accept: application/json' \
## Icinga starts/restarts/reloads very slowly
### Try swapping out the allocator
Optimise apply rules and group assign conditions.
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
#
```
### Optimise apply rules and group assign conditions
#### Remove actually unused apply rules
### Remove actually unused apply rules
If `icinga2 daemon -C` warns you like shown below and the respective apply rule
should indeed create no objects, consider removing it. At least comment it out.
@ -307,7 +253,7 @@ but you can disable apply rules (temporarily or permanently).
Same for `assign where` conditions in groups. In this case removing just
the `assign where` line(s) is enough if you'd like to keep the group itself.
#### Avoid creating single objects via apply rules
### Avoid creating single objects via apply rules
If possible, replace constructs like the immediately following with the below one.
@ -339,7 +285,7 @@ object Host "firewall" {
}
```
#### Reduce `assign where` filter complexity
### Reduce `assign where` filter complexity
If neither removals, nor flat objects, nor Icinga v2.13.6+
are an option, at least keep the filter as simple as possible.