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Adjust nice values to 0 #19191

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be77732
Adjust nice values to 0
cp-elastic Jun 4, 2026
c8ab13c
Add docs to address manual change
cp-elastic Jun 4, 2026
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2 changes: 1 addition & 1 deletion config/startup.options
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ LS_GC_LOG_FILE=/var/log/logstash/gc.log
LS_OPEN_FILES=16384

# Nice level
LS_NICE=19
LS_NICE=0

# Change these to have the init script named and described differently
# This is useful when running multiple instances of Logstash on the same
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8 changes: 7 additions & 1 deletion docs/reference/performance-troubleshooting.md
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Expand Up @@ -52,7 +52,13 @@ You may be tempted to jump ahead and change settings like `pipeline.workers` (`-
* Set the minimum (Xms) and maximum (Xmx) heap allocation size to the same value to prevent the heap from resizing at runtime, which is a very costly process.
* You can make more accurate measurements of the JVM heap by using either the `jmap` command line utility distributed with Java or by using VisualVM. For more info, see [Profiling the heap](/reference/tuning-logstash.md#profiling-the-heap).

4. **Tune Logstash pipeline settings:**
4. **Adjust process `nice` value to `0`:**

* Logstash historically defaulted to a `nice` value of `19` in order to not interfere with normal operation of services and applications it runs alongside. This causes Logstash to run at **the lowest priority** possible.
* For **RPM/DEB** installations, Logstash's systemd unit file is located at `/usr/lib/systemd/system/logstash.service`.
* For **Tarball** installations, Logstash instead uses `$LS_SETTINGS_DIR/config/startup.options` if it was installed with `bin/system-install`. Running directly from the directory (i.e. `./bin/logstash`) is unaffected.

5. **Tune Logstash pipeline settings:**

* Continue on to [Tuning and profiling logstash pipeline performance](/reference/tuning-logstash.md) to learn about tuning individual pipelines.

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2 changes: 1 addition & 1 deletion pkg/service_templates/systemd/lib/systemd/system/logstash.service
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Expand Up @@ -13,7 +13,7 @@ EnvironmentFile=-/etc/sysconfig/logstash
ExecStart=/usr/share/logstash/bin/logstash "--path.settings" "/etc/logstash"
Restart=always
WorkingDirectory=/
Nice=19
Nice=0
LimitNOFILE=16384

# When stopping, how long to wait before giving up and sending SIGKILL?
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2 changes: 1 addition & 1 deletion pkg/service_templates/sysv/etc/default/logstash
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Expand Up @@ -5,6 +5,6 @@ LS_USER="logstash"
LS_GROUP="logstash"
LS_GC_LOG_FILE="/var/log/logstash/gc.log"
LS_OPEN_FILES="16384"
LS_NICE="19"
LS_NICE="0"
SERVICE_NAME="logstash"
SERVICE_DESCRIPTION="logstash"
2 changes: 1 addition & 1 deletion pkg/service_templates/sysv/etc/init.d/logstash
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Expand Up @@ -26,7 +26,7 @@ user="logstash"
group="logstash"
chroot="/"
chdir="/"
nice="19"
nice="0"
limit_open_files="16384"


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