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Decrease minimum RAM allocation in JVM

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Julian Chang 2026-08-23 00:27:14 +07:00
parent efed361417
commit b9f408079e
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1 changed files with 24 additions and 9 deletions
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33
packages/oneclient_mc/src/arguments.rs
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@ -64,6 +64,8 @@ pub fn java_arguments(
const ZGC_MIN_HEAP_MB: u32 = 8192;
const INITIAL_HEAP_MB: u32 = 512;
#[must_use]
pub fn performance_flags(
java_major: u32,
@ -71,7 +73,7 @@ pub fn performance_flags(
mem_max: u32,
custom_args: &[String],
) -> Vec<String> {
let mut flags = vec![format!("-Xms{mem_max}M")];
let mut flags = vec![format!("-Xms{}M", mem_max.min(INITIAL_HEAP_MB))];
let collector_chosen = custom_args.iter().any(|arg| is_collector_flag(arg));
@ -554,7 +556,7 @@ mod tests {
#[test]
fn a_java_8_runtime_gets_g1() {
let j8 = flags(8, "amd64", 4096);
assert_eq!(j8.first().unwrap(), "-Xms4096M");
assert_eq!(j8.first().unwrap(), "-Xms512M");
assert!(j8.contains(&"-XX:+UseG1GC".to_string()));
}
@ -620,7 +622,7 @@ mod tests {
assert_eq!(
flags,
vec![
format!("-Xms{mem}M"),
"-Xms512M".to_string(),
"-XX:+UseG1GC".to_string(),
"-XX:+ParallelRefProcEnabled".to_string(),
],
@ -649,7 +651,7 @@ mod tests {
);
assert_eq!(
flags,
vec!["-Xms16384M"],
vec!["-Xms512M"],
"{arg} should leave only the collector-independent flags"
);
}
@ -749,7 +751,7 @@ mod tests {
assert_eq!(
flags(25, "aarch64", 16384),
vec![
"-Xms16384M",
"-Xms512M",
"-XX:+UseZGC",
"-XX:+UseCompactObjectHeaders"
]
@ -757,19 +759,32 @@ mod tests {
}
#[test]
fn every_tier_pins_the_heap_to_the_memory_setting() {
fn every_tier_starts_small_and_grows_into_the_memory_setting() {
for major in [8, 17, 21, 25] {
assert_eq!(
flags(major, "amd64", 8192).first().unwrap(),
"-Xms8192M",
"java {major} should start at the memory setting"
"-Xms512M",
"java {major} should not commit the ceiling up front"
);
}
}
#[test]
fn a_tiny_profile_never_starts_above_its_ceiling() {
assert_eq!(
flags(21, "amd64", 256),
vec![
"-Xms256M",
"-XX:+UseG1GC",
"-XX:+ParallelRefProcEnabled",
],
"a start size above the maximum is refused by the JVM outright"
);
}
#[test]
fn a_java_7_runtime_is_left_untouched() {
assert_eq!(flags(7, "amd64", 4096), vec!["-Xms4096M"]);
assert_eq!(flags(7, "amd64", 4096), vec!["-Xms512M"]);
}
}