The file generated by running 'build' consumes more memory than 'zig build run'

[updoo]

Zig Version

0.12.0

Steps to Reproduce and Observed Behavior

example from github.com:zigzap/zap

const std = @import("std");
const zap = @import("zap");

fn on_request(r: zap.Request) void {
    r.sendBody("Hello, World!") catch return;
}

pub fn main() !void {
    var listener = zap.HttpListener.init(.{
        .port = 3000,
        .on_request = on_request,
        .log = false,
    });
    try listener.listen();

    std.debug.print("Listening on 0.0.0.0:3000\n", .{});

    // start worker threads
    zap.start(.{
        .threads = 3,
        .workers = 3,
    });
}

run on mac m1

# step 1:  run with 'zig build run', using 3MB of memory
zig build run

# step 2: run binary generated by 'zig build'，using 22MB of memory
zig build
./zig-out/bin/hello

Expected Behavior

Memory usage should be consistent

[Vexu]

What's in your build.zig?

[mlugg]

Also, how are you measuring memory consumption? The peak RSS of the zig build run command won't include the memory usage of your application, because it's a subprocess.

In general, the "Steps to Reproduce" section should include exact steps, i.e. the precise commands / applications that were run and the relevant output to observe.