set max_rss=1 everywhere to see what we actually get on all machines

.forgejo/workflows/ci.yaml

@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - master
+      - max-rss-tuning
   workflow_dispatch:
 
 concurrency:

build.zig

@@ -459,8 +459,7 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        // 3888779264 was observed on an x86_64-linux-gnu host.
-        .max_rss = 4000000000,
+        .max_rss = 1,
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -483,6 +482,7 @@ pub fn build(b: *std.Build) !void {
         .skip_llvm = skip_llvm,
         .skip_libc = true,
         .no_builtin = true,
+        .max_rss = 1,
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -505,6 +505,7 @@ pub fn build(b: *std.Build) !void {
         .skip_llvm = skip_llvm,
         .skip_libc = true,
         .no_builtin = true,
+        .max_rss = 1,
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -526,8 +527,7 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        // I observed a value of 5605064704 on the M2 CI.
-        .max_rss = 6165571174,
+        .max_rss = 1,
     }));
 
     const unit_tests_step = b.step("test-unit", "Run the compiler source unit tests");
@@ -721,7 +721,7 @@ fn addCompilerMod(b: *std.Build, options: AddCompilerModOptions) *std.Build.Modu
 fn addCompilerStep(b: *std.Build, options: AddCompilerModOptions) *std.Build.Step.Compile {
     const exe = b.addExecutable(.{
         .name = "zig",
-        .max_rss = 7_800_000_000,
+        .max_rss = 1,
         .root_module = addCompilerMod(b, options),
     });
     exe.stack_size = stack_size;