Add endpoints for heap profiling

Cargo.toml

@@ -276,6 +276,7 @@ windows-sys = "0.59"
 xdg = "2.5"
 tikv-jemallocator = { version = "0.6.0", features = ["profiling", "stats"] }
 tikv-jemalloc-ctl = { version = "0.6.0", features = ["stats"]}
+jemalloc_pprof = { version = "0.7", features = ["symbolize", "flamegraph"] }
 
 # Vendor the openssl we rely on, rather than depend on a
 # potentially very old system version.

crates/bench/benches/subscription.rs

@@ -17,6 +17,13 @@ use spacetimedb_primitives::{col_list, TableId};
 use spacetimedb_query::compile_subscription;
 use spacetimedb_sats::{bsatn, product, AlgebraicType, AlgebraicValue, ProductValue};
 
+#[cfg(not(target_env = "msvc"))]
+use tikv_jemallocator::Jemalloc;
+
+#[cfg(not(target_env = "msvc"))]
+#[global_allocator]
+static GLOBAL: Jemalloc = Jemalloc;
+
 fn create_table_location(db: &RelationalDB) -> Result<TableId, DBError> {
     let schema = &[
         ("entity_id", AlgebraicType::U64),

crates/client-api/Cargo.toml

@@ -49,5 +49,8 @@ jsonwebtoken.workspace = true
 scopeguard.workspace = true
 serde_with.workspace = true
 
+[target.'cfg(not(target_env = "msvc"))'.dependencies]
+jemalloc_pprof.workspace = true
+
 [dev-dependencies]
 jsonwebtoken.workspace = true