fix: revert heap to 2.5 GiB to keep initrd range backed by shared memory

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

host/src/bin/pydriver_run.rs

@@ -44,7 +44,7 @@ fn main() -> Result<()> {
     let t_evolve = Instant::now();
     let mut sandbox = Sandbox::builder(&kernel)
         .initrd_file(&initrd)
-        .heap_size(2304 * 1024 * 1024)
+        .heap_size(5 * 512 * 1024 * 1024)
         .build()?;
     eprintln!(
         "[timing] evolve={:.1}ms",

host/src/bin/pyhl.rs

@@ -451,7 +451,7 @@ fn cmd_setup(args: SetupArgs) -> Result<()> {
     {
         let mut builder = Sandbox::builder(&dst_kernel)
             .initrd_file(&dst_initrd)
-            .heap_size(2304 * 1024 * 1024);
+            .heap_size(5 * 512 * 1024 * 1024);
         for p in &setup_preopens {
             builder = builder.preopen(p.clone());
         }

host/src/pyhl.rs

@@ -197,7 +197,7 @@ pub fn install(opts: &InstallOptions<'_>) -> Result<InstallReport> {
     {
         let mut builder = Sandbox::builder(&dst_kernel)
             .initrd_file(&dst_initrd)
-            .heap_size(2304 * 1024 * 1024);
+            .heap_size(5 * 512 * 1024 * 1024);
         for p in opts.mounts {
             builder = builder.preopen(p.clone());
         }