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agents: read the memory cap at boot, not from the build

Browse source 
An agent's memory cap was rendered into its flake (`memoryMaxBytes` →
`services.hyperhive.agent.claudeMemoryMaxBytes`), so the closure depended
on it and a changed cap reached the JSC heap ceiling and the subagent
`MemoryHigh=` only after a rebuild.

hive-c0re now writes the effective `MemoryMax=` in bytes to the agent's
runtime dir (`/run/hive/memory-max-bytes` inside) in `write_dropins`,
from the same value the drop-in gets. The file is removed for
`infinity` or a RAM percentage, and left alone when the drop-in is kept.

Inside the container, `nix/agent-modules/memory-cap.nix` reads it at
boot: an environment generator sets `BUN_JSC_forceRAMSize` (75%) for
every unit and `machinectl shell`, `/etc/set-environment` exports it in
login shells, and a unit generator writes `MemoryHigh=` (2/3) as a
drop-in for `hive-subagent-daemon`.

The render drops `memoryMaxBytes`, the agent option is removed (both
spellings fail eval with a removal message), and
`effective_memory_bytes_from` goes with its only caller.

Part of #5081 (slice S0-2).
This commit is contained in:
atlas 2026-10-12 09:00:45 +02:00
commit 0d619e215e
15 changed files with 416 additions and 287 deletions
Download patch file Download diff file Expand all files Collapse all files

96
hive-c0re/src/agent_config/resource_limits.rs
View file

@ -122,55 +122,6 @@ fn resolve(limits: &AgentLimits, hive_cpu_quota: &str, hive_memory_max: &str) ->
(cpu, mem)
}
/// Effective `MemoryMax=` string for `name` against an already-loaded
/// map — the memory-only half of [`effective_from`], split out because
/// [`effective_memory_bytes_from`] doesn't have a CPU quota to pass.
/// No single-agent convenience wrapper (unlike [`effective`] /
/// [`effective_from`]): every current caller already has a loaded map
/// in hand, so one would just be dead code.
#[must_use]
fn effective_memory_max_from(
limits: &BTreeMap<String, AgentLimits>,
name: &str,
hive_memory_max: &str,
) -> String {
limits
.get(name)
.and_then(|l| l.memory_max.clone())
.unwrap_or_else(|| hive_memory_max.to_owned())
}
/// Effective `MemoryMax=` for `name`, as a raw byte count, against an
/// already-loaded map — the form `render_flake_with_lookup` uses so it
/// doesn't re-read `resource-limits.json` once per agent (same
/// reasoning as [`effective_from`] / `container_view::build_all`). No
/// single-agent convenience wrapper, for the same reason as
/// [`effective_memory_max_from`] — every current caller already has a
/// loaded map in hand.
///
/// Logs a `warn!` naming `name` when the effective value is a RAM
/// percentage: unlike `"infinity"`, a percentage IS a real, resolvable
/// cap — resolving one just needs host `MemTotal`, which this module
/// doesn't track — so today it degrades to `None` (no derived heap
/// ceiling) rather than silently guessing wrong against `MemTotal`.
#[must_use]
pub fn effective_memory_bytes_from(
limits: &BTreeMap<String, AgentLimits>,
name: &str,
hive_memory_max: &str,
) -> Option<u64> {
let mem = effective_memory_max_from(limits, name, hive_memory_max);
if mem.ends_with('%') {
tracing::warn!(
agent = name,
memory_max = %mem,
"effective MemoryMax= is a RAM percentage; can't derive a JSC heap ceiling from it \
without host MemTotal — leaving BUN_JSC_forceRAMSize unset for this agent"
);
}
parse_bytes(&mem)
}
/// Parse a systemd `MemoryMax=`-style byte-size value (`"4G"`, `"512M"`,
/// a bare byte count, optionally with a decimal like `"1.5G"`) into a
/// raw byte count. systemd's `K`/`M`/`G`/`T` suffixes are IEC binary
@ -179,9 +130,8 @@ pub fn effective_memory_bytes_from(
/// value is always a small non-negative decimal (enforced by
/// [`is_plain_number`] upstream in [`validate_memory_max`]), so floats
/// would only add rounding / sign-loss risk for no benefit. Returns
/// `None` for `"infinity"` and percentages; see
/// [`effective_memory_bytes_from`] for why those can't be turned into a
/// byte count here.
/// `None` for `"infinity"` and for percentages, which need the host's
/// `MemTotal` to resolve.
#[must_use]
pub fn parse_bytes(value: &str) -> Option<u64> {
if value == "infinity" || value.ends_with('%') {
@ -532,46 +482,4 @@ mod tests {
assert_eq!(parse_bytes(v), None, "{v} should not parse");
}
}
#[test]
fn effective_memory_bytes_falls_back_to_hive_default() {
// Empty map, i.e. no per-agent override — exercises the
// "use the hive-wide default" arm end to end.
let empty = BTreeMap::new();
assert_eq!(
effective_memory_bytes_from(&empty, "nobody-configured-this-agent", "4G"),
Some(4 * 1024 * 1024 * 1024)
);
assert_eq!(
effective_memory_bytes_from(&empty, "nobody-configured-this-agent", "infinity"),
None
);
}
#[test]
fn effective_memory_bytes_from_prefers_per_agent_override() {
let map = BTreeMap::from([("sock".to_owned(), limits(None, Some("8G")))]);
assert_eq!(
effective_memory_bytes_from(&map, "sock", HIVE_MEM),
Some(8 * 1024 * 1024 * 1024)
);
// A different agent not in the map still falls back to the
// hive-wide default from the same loaded map (no re-read).
assert_eq!(
effective_memory_bytes_from(&map, "iris", HIVE_MEM),
Some(4 * 1024 * 1024 * 1024)
);
}
/// A percentage cap is real and resolvable in principle, but this
/// module has no host `MemTotal` to resolve it against — must
/// degrade to `None` (no derived heap ceiling) rather than silently
/// treating it as unbounded or guessing a number. `warn!` firing is
/// exercised for coverage but not asserted on (no tracing test
/// subscriber wired up here) — the `None` return is the contract.
#[test]
fn effective_memory_bytes_from_returns_none_for_percentage() {
let map = BTreeMap::from([("sock".to_owned(), limits(None, Some("50%")))]);
assert_eq!(effective_memory_bytes_from(&map, "sock", HIVE_MEM), None);
}
}

137
hive-c0re/src/lifecycle/host_config.rs
View file

@ -1,6 +1,7 @@
//! Per-container host-side config: the nspawn conf rewrite (bind mounts,
//! network isolation, forwarded credentials), the systemd resource-limits
//! drop-in, and the `write_dropins` verb that re-applies both.
//! drop-in, the agent's copy of its memory cap, and the `write_dropins` verb
//! that re-applies them.
use std::path::{Path, PathBuf};
@ -16,20 +17,21 @@ use super::{
};
/// Re-apply the per-container host-side config: nspawn flags (bind
/// mounts etc.), the systemd resource-limits drop-in, and a daemon
/// reload so both take effect on the next unit (re)start. Idempotent —
/// the job queue's `WriteDropin` node, also folded into every `Swap`
/// (rebuild is the reconcile verb).
/// mounts etc.), the systemd resource-limits drop-in, the agent's copy of
/// its memory cap, and a daemon reload so all of it takes effect on the next
/// unit (re)start. Idempotent — the job queue's `WriteDropin` node, also
/// folded into every `Swap` (rebuild is the reconcile verb).
pub async fn write_dropins(name: &str, hive: &HiveEnv, paths: &AgentPaths) -> Result<()> {
validate(name)?;
let container = container_name(name);
set_nspawn_flags(&container, &paths.agent, &paths.claude, &paths.notes).await?;
if let Some((cpu_quota, memory_max)) = limits_to_apply(
if let Some((cpu_quota, memory_max)) = stage_limits(
name,
&crate::resource_limits::resource_limits_path(),
&limits_dropin_path(&container),
&paths.agent,
hive,
) {
)? {
set_resource_limits(
&container,
&cpu_quota,
@ -51,6 +53,60 @@ fn limits_dropin_path(container: &str) -> PathBuf {
))
}
/// File in the agent's runtime dir, `/run/hive/` in the container, holding the
/// byte count of the `MemoryMax=` its drop-in carries.
/// `nix/agent-modules/memory-cap.nix` reads it at boot under this name.
const MEMORY_CAP_FILE: &str = "memory-max-bytes";
/// [`limits_to_apply`], plus handing the memory cap to the agent through
/// [`MEMORY_CAP_FILE`] in `runtime_dir`. The container cannot read the cap
/// systemd enforces on it, so this file is how it learns the value it sizes
/// its heap and its subagents against. When the drop-in is kept as it is, so is
/// the file.
fn stage_limits(
agent_name: &str,
limits_path: &Path,
dropin_path: &Path,
runtime_dir: &Path,
hive: &HiveEnv,
) -> Result<Option<(String, String)>> {
let limits = limits_to_apply(agent_name, limits_path, dropin_path, hive);
if let Some((_, memory_max)) = &limits {
write_memory_cap(runtime_dir, agent_name, memory_max)?;
}
Ok(limits)
}
/// Write `memory_max` into [`MEMORY_CAP_FILE`] as a byte count, or remove the
/// file when the value has none: `infinity`, or a RAM percentage, which needs
/// the host's `MemTotal` to resolve. With no file the agent sets no heap or
/// subagent ceiling.
fn write_memory_cap(runtime_dir: &Path, agent_name: &str, memory_max: &str) -> Result<()> {
let path = runtime_dir.join(MEMORY_CAP_FILE);
let Some(bytes) = crate::resource_limits::parse_bytes(memory_max) else {
if memory_max.ends_with('%') {
tracing::warn!(
agent = agent_name,
memory_max,
"effective MemoryMax= is a RAM percentage; the agent gets no byte count, so \
no JSC heap ceiling and no subagent MemoryHigh="
);
}
return match std::fs::remove_file(&path) {
Err(e) if e.kind() != std::io::ErrorKind::NotFound => {
Err(e).with_context(|| format!("remove {}", path.display()))
}
_ => Ok(()),
};
};
std::fs::create_dir_all(runtime_dir)
.with_context(|| format!("create agent runtime dir {}", runtime_dir.display()))?;
let tmp = runtime_dir.join(format!(".{MEMORY_CAP_FILE}.tmp"));
std::fs::write(&tmp, format!("{bytes}\n"))
.with_context(|| format!("write {}", tmp.display()))?;
std::fs::rename(&tmp, &path).with_context(|| format!("rename onto {}", path.display()))
}
/// The `(CPUQuota, MemoryMax)` to write into `agent_name`'s limits
/// drop-in, or `None` to leave the drop-in at `dropin_path` as it is.
///
@ -489,8 +545,9 @@ async fn set_nspawn_flags(
#[cfg(test)]
mod tests {
use super::{
BindMount, QUEUE_CLIENT_ID_CREDENTIAL, QUEUE_SECRET_CREDENTIAL, bind_child_agent_dirs,
bind_own_agent_dirs, holds_manage_root_agent, limits_to_apply, queue_agent_credentials,
BindMount, MEMORY_CAP_FILE, QUEUE_CLIENT_ID_CREDENTIAL, QUEUE_SECRET_CREDENTIAL,
bind_child_agent_dirs, bind_own_agent_dirs, holds_manage_root_agent, limits_to_apply,
queue_agent_credentials, stage_limits,
};
use crate::coordinator::HiveEnv;
@ -707,4 +764,66 @@ mod tests {
let applied = limits_to_apply("sock", &limits, &dropin, &HiveEnv::default());
assert_eq!(applied, Some(("200%".to_owned(), "1G".to_owned())));
}
/// Runs [`stage_limits`] against the files in `dir` and returns the
/// drop-in's `MemoryMax=` and the agent's copy of it, `None` when absent.
fn stage(dir: &tempfile::TempDir) -> (Option<String>, Option<String>) {
let runtime = dir.path().join("runtime");
let applied = stage_limits(
"sock",
&dir.path().join("resource-limits.json"),
&dir.path().join("hyperhive-limits.conf"),
&runtime,
&HiveEnv::default(),
)
.expect("stage limits");
let copy = std::fs::read_to_string(runtime.join(MEMORY_CAP_FILE)).ok();
(applied.map(|(_, mem)| mem), copy)
}
#[test]
fn the_agent_reads_the_cap_its_dropin_carries() {
let dir = tempfile::tempdir().expect("tempdir");
let limits = dir.path().join("resource-limits.json");
// No overrides anywhere: the hive-wide default, 4G.
assert_eq!(
stage(&dir),
(Some("4G".to_owned()), Some("4294967296\n".to_owned()))
);
std::fs::write(&limits, r#"{"sock": {"memory_max": "16G"}}"#).expect("seed limits");
assert_eq!(
stage(&dir),
(Some("16G".to_owned()), Some("17179869184\n".to_owned()))
);
}
#[test]
fn a_cap_with_no_byte_count_removes_the_agents_copy() {
let dir = tempfile::tempdir().expect("tempdir");
let limits = dir.path().join("resource-limits.json");
assert_eq!(stage(&dir).1, Some("4294967296\n".to_owned()));
std::fs::write(&limits, r#"{"sock": {"memory_max": "infinity"}}"#).expect("seed limits");
assert_eq!(stage(&dir), (Some("infinity".to_owned()), None));
assert_eq!(stage(&dir).1, None, "an absent copy stays absent");
std::fs::write(&limits, r#"{"sock": {"memory_max": "50%"}}"#).expect("seed limits");
assert_eq!(stage(&dir), (Some("50%".to_owned()), None));
}
#[test]
fn a_kept_dropin_keeps_the_agents_copy() {
let dir = tempfile::tempdir().expect("tempdir");
let limits = dir.path().join("resource-limits.json");
std::fs::write(&limits, r#"{"sock": {"memory_max": "1G"}}"#).expect("seed limits");
assert_eq!(stage(&dir).1, Some("1073741824\n".to_owned()));
std::fs::write(&limits, TRUNCATED_LIMITS).expect("seed limits");
std::fs::write(dir.path().join("hyperhive-limits.conf"), "MemoryMax=1G\n")
.expect("seed drop-in");
assert_eq!(stage(&dir), (None, Some("1073741824\n".to_owned())));
}
}

107
hive-c0re/src/meta.rs
View file

@ -88,17 +88,7 @@ pub async fn sync_agents(hive: &HiveEnv, agents: &[AgentSpec]) -> Result<()> {
let dir = crate::paths::meta_root();
std::fs::create_dir_all(&dir).with_context(|| format!("create {}", dir.display()))?;
let new_flake = render_flake(
&hive.hyperhive_flake,
&hive.hyperhive_docs_flake,
&hive.nixpkgs_flake,
hive.claude_code_path.as_deref(),
hive.dashboard_port,
&hive.operator_pronouns,
&hive.context_window_tokens,
&hive.agent_memory_max,
agents,
)?;
let new_flake = render_hive_flake(hive, agents)?;
let flake_path = dir.join("flake.nix");
let on_disk = std::fs::read_to_string(&flake_path).unwrap_or_default();
let initial = !dir.join(".git").exists();
@ -444,6 +434,21 @@ pub async fn commit_perms(
Ok(())
}
/// [`render_flake`] with its inputs taken from `hive`, as [`sync_agents`]
/// renders it.
fn render_hive_flake(hive: &HiveEnv, agents: &[AgentSpec]) -> Result<String> {
render_flake(
&hive.hyperhive_flake,
&hive.hyperhive_docs_flake,
&hive.nixpkgs_flake,
hive.claude_code_path.as_deref(),
hive.dashboard_port,
&hive.operator_pronouns,
&hive.context_window_tokens,
agents,
)
}
#[allow(
clippy::too_many_arguments,
reason = "many genuine flake inputs (source flakes, port, pronouns, tokens, \
@ -457,7 +462,6 @@ fn render_flake(
dashboard_port: u16,
operator_pronouns: &str,
context_window_tokens: &std::collections::HashMap<String, u64>,
hive_memory_max: &str,
agents: &[AgentSpec],
) -> Result<String> {
render_flake_with_lookup(
@ -468,7 +472,6 @@ fn render_flake(
dashboard_port,
operator_pronouns,
context_window_tokens,
hive_memory_max,
agents,
agent_canonical_inputs,
)
@ -861,7 +864,6 @@ fn render_flake_with_lookup<F>(
dashboard_port: u16,
operator_pronouns: &str,
context_window_tokens: &std::collections::HashMap<String, u64>,
hive_memory_max: &str,
agents: &[AgentSpec],
lookup: F,
) -> Result<String>
@ -943,7 +945,7 @@ where
let pronouns_escaped = operator_pronouns.replace('\\', "\\\\").replace('"', "\\\"");
let _ = writeln!(
out,
" dashboardPort = {dashboard_port};\n operatorPronouns = \"{pronouns_escaped}\";\n mkAgent = {{ name, isManager, port, toolGroups ? null, capabilities ? null, memoryMaxBytes ? null }}:"
" dashboardPort = {dashboard_port};\n operatorPronouns = \"{pronouns_escaped}\";\n mkAgent = {{ name, isManager, port, toolGroups ? null, capabilities ? null }}:"
);
out.push_str(
r#" let
@ -1094,7 +1096,6 @@ where
# nspawn itself already call this container, so logs join to
# both without a prefix transform.
networking.hostName = "h-${name}";
services.hyperhive.agent.claudeMemoryMaxBytes = memoryMaxBytes;
programs.git.config.user = {
name = name;
email = "${name}@hyperhive.local";
@ -1177,12 +1178,9 @@ where
);
// Propagated, never read as empty: an agent with no tool-groups entry
// renders `toolGroups = null` and gets `AGENT_DEFAULT`, which fails
// open for any agent whose explicit entry is narrower. Likewise an
// agent with no resource-limits entry gets the hive `memoryMaxBytes`,
// a larger heap ceiling than a tighter override.
// open for any agent whose explicit entry is narrower.
let tool_groups_map = crate::tool_groups::read()?;
let capabilities_map = crate::capabilities::read()?;
let resource_limits_map = crate::resource_limits::read()?;
for spec in agents {
// Emit `toolGroups = "group1,group2"` when the operator has
// explicitly configured groups for this agent. Absent entry = null
@ -1208,29 +1206,15 @@ where
let joined = caps.join(",");
format!("\"{joined}\"")
};
// Effective `MemoryMax=` for this agent (per-agent override, else
// the hive-wide default), turned into a raw byte count so
// the agent's claude-settings module can derive a JSC heap ceiling
// (see `services.hyperhive.agent.claudeMemoryMaxBytes`). `null` when the
// effective value is `"infinity"` or a RAM percentage — no
// byte count to derive, dependent env var stays unset, same as
// today's no-cap behavior.
let memory_max_attr = crate::resource_limits::effective_memory_bytes_from(
&resource_limits_map,
&spec.name,
hive_memory_max,
)
.map_or_else(|| "null".to_owned(), |b| b.to_string());
let _ = writeln!(
out,
" {} = mkAgent {{ name = \"{}\"; isManager = {}; port = {}; toolGroups = {}; capabilities = {}; memoryMaxBytes = {}; }};",
" {} = mkAgent {{ name = \"{}\"; isManager = {}; port = {}; toolGroups = {}; capabilities = {}; }};",
spec.name,
spec.name,
if spec.is_manager { "true" } else { "false" },
spec.port,
tool_groups_attr,
capabilities_attr,
memory_max_attr,
);
}
out.push_str(" };\n };\n}\n");
@ -1468,7 +1452,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1516,7 +1499,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1536,7 +1518,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1578,7 +1559,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1608,7 +1588,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1630,7 +1609,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1662,7 +1640,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[
sample_spec("argus", false, 9001),
sample_spec("bitburner", false, 9002),
@ -1697,7 +1674,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
|_| Vec::new(),
)
@ -1737,7 +1713,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -1784,7 +1759,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake")
@ -1966,7 +1940,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -2004,7 +1977,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
@ -2050,7 +2022,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake")
@ -2144,7 +2115,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake")
@ -2220,7 +2190,6 @@ mod tests {
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake")
@ -2246,32 +2215,20 @@ mod tests {
);
}
/// The JSC-heap-ceiling fix needs the effective per-agent memory cap
/// threaded into the flake as raw bytes, since nspawn hides the real
/// cgroup cap from inside the container. An
/// agent with no `resource-limits.json` override falls back to the
/// hive-wide default passed to `render_flake` (`"4G"` in every test
/// in this module) — this locks in the byte-count conversion end to
/// end through the actual render path (not just `parse_bytes`
/// in isolation).
/// The agent reads its memory cap at boot from the copy
/// `lifecycle::write_dropins` hands it, so the cap is no build input.
#[test]
fn render_flake_derives_memory_max_bytes_from_hive_default() {
let out = render_flake(
"github:example/hyperhive",
"path:/nix/store/bbbb-hyperhive-docs-source",
"path:/nix/store/aaaa-nixpkgs-source",
None,
8000,
"she/her",
&std::collections::HashMap::new(),
"4G",
&[sample_spec("alice", false, 9001)],
)
.expect("render flake");
let want_bytes = 4u64 * 1024 * 1024 * 1024;
assert!(
out.contains(&format!("memoryMaxBytes = {want_bytes};")),
"memoryMaxBytes must reflect the hive-wide default in bytes:\n{out}"
fn render_hive_flake_is_identical_across_memory_caps() {
let hive = |cap: &str| HiveEnv {
agent_memory_max: cap.to_owned(),
..HiveEnv::default()
};
let agents = [sample_spec("alice", false, 9001)];
let small = render_hive_flake(&hive("4G"), &agents).expect("render 4G");
let large = render_hive_flake(&hive("16G"), &agents).expect("render 16G");
assert_eq!(
small, large,
"the rendered flake must not depend on the memory cap"
);
}
}

7
hive-c0re/src/server.rs
View file

@ -433,10 +433,9 @@ async fn handle_set_resource_limits(
&hive.agent_memory_max,
)?;
Ok(HostResponse::messages(vec![format!(
"{name}: CPUQuota={cpu} MemoryMax={mem} — the cgroup cap itself is live now (restart \
the container if it's running and needs the new cap immediately), but the derived \
Claude/JSC heap ceiling is baked in at build time, so it needs a REBUILD \
(`hivectl agent {name} rebuild`) to actually track this change"
"{name}: CPUQuota={cpu} MemoryMax={mem} — the cgroup cap itself is live now; the \
Claude/JSC heap ceiling and the subagent MemoryHigh= derived from it follow at the \
container's next start (restart it if it's running and needs them now)"
)]))
}