Spring Cloud Config Server - Expected Memory Footprint Seems Large - spring-cloud-config

Question

Spring Cloud Config Server - 1.4.2.RELEASE
Java 8
I have a vanilla Spring Cloud Config Server (POM below).
Main features used are:
downloading config files from Git
encryption/decryption through an SSH file
When I start it up with no memory constraints it cranks up to 7460.88 Mb.
When I add constraints like below, it is at 3653.82 Mb.
-Xms256m -Xmx256m -Xmn96m -XX:+UseNUMA -XX:+UseG1GC -XX:+AlwaysPreTouch -XX:+PerfDisableSharedMem -XX:+ParallelRefProcEnabled
As you can tell by my memory constraints I was expecting it to hang out around 256 Mb.
Was this an unrealistic expectation?
Is there a way to get it down further?
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>any.group</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-cloud-config-server</name>
<description>Spring-Cloud-Config-Server that loads configuration from GIT for Spring Boot Applications.</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>1.4.2.RELEASE</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<version>${spring-cloud.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

Answer 1

Nevermind, believe I was calculating the memory wrong.
I was using this command originally: https://stackoverflow.com/a/44711589/4681044
But instead now I used the "top" command and got the percentage and used that against the total available and got 492Mb.