diff --git a/README.md b/README.md
index 5a5e43f..4318341 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ const programC = @import("projectC/main.zig").main;
 pub fn main(init: std.process.Init) !void {
 
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     // Associate executable names to zig entry functions
diff --git a/examples/delete_dir.zig b/examples/delete_dir.zig
index 84ddc8d..9faa711 100644
--- a/examples/delete_dir.zig
+++ b/examples/delete_dir.zig
@@ -32,7 +32,7 @@ fn deleteDirProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("delete_dir", deleteDirProgram);
diff --git a/examples/delete_file.zig b/examples/delete_file.zig
index 6c6a9df..cb25426 100644
--- a/examples/delete_file.zig
+++ b/examples/delete_file.zig
@@ -25,7 +25,7 @@ fn deleteFileProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("delete_file", deleteFileProgram);
diff --git a/examples/directories.zig b/examples/directories.zig
index d3b1912..32fe6aa 100644
--- a/examples/directories.zig
+++ b/examples/directories.zig
@@ -28,7 +28,7 @@ fn directoriesProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("directories", directoriesProgram);
diff --git a/examples/example.zig b/examples/example.zig
index 343ff8f..738c874 100644
--- a/examples/example.zig
+++ b/examples/example.zig
@@ -29,7 +29,7 @@ fn programC(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     // Associate executable names to zig entry functions
diff --git a/examples/list_dir.zig b/examples/list_dir.zig
index 0b2a07b..056437d 100644
--- a/examples/list_dir.zig
+++ b/examples/list_dir.zig
@@ -23,7 +23,7 @@ fn listDirProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("list_dir", listDirProgram);
diff --git a/examples/open_file.zig b/examples/open_file.zig
index 6fcf4c3..3867c79 100644
--- a/examples/open_file.zig
+++ b/examples/open_file.zig
@@ -13,7 +13,7 @@ fn createFileProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("create_file", createFileProgram);
diff --git a/examples/read_file.zig b/examples/read_file.zig
index d0c9732..7d283a1 100644
--- a/examples/read_file.zig
+++ b/examples/read_file.zig
@@ -23,7 +23,7 @@ fn readFileProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("read_file", readFileProgram);
diff --git a/examples/select_group_async.zig b/examples/select_group_async.zig
index 7f7bcbb..7fd6601 100644
--- a/examples/select_group_async.zig
+++ b/examples/select_group_async.zig
@@ -26,7 +26,7 @@ fn program(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("select_group_async", program);
diff --git a/examples/sleep.zig b/examples/sleep.zig
index 5f6c8d2..5b29e76 100644
--- a/examples/sleep.zig
+++ b/examples/sleep.zig
@@ -21,7 +21,7 @@ fn fastProgram(init: std.process.Init) anyerror!void {
 
 pub fn main(init: std.process.Init) !void {
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("slow", slowProgram);
diff --git a/examples/tcp_ping_pong.zig b/examples/tcp_ping_pong.zig
index e654249..7b2feb3 100644
--- a/examples/tcp_ping_pong.zig
+++ b/examples/tcp_ping_pong.zig
@@ -63,7 +63,7 @@ pub fn main(init: std.process.Init) !void {
     const server_addresses = [_]u32{std.mem.readInt(u32, &server_ip.bytes, .big)};
 
     var sim: Simulator = undefined;
-    sim.init(std.heap.page_allocator, init.io);
+    sim.init(std.heap.page_allocator, init.io, 0);
     defer sim.deinit();
 
     try sim.addExecutable("server", serverProgram);
diff --git a/src/scheduler.zig b/src/scheduler.zig
index 7dad856..640b74e 100644
--- a/src/scheduler.zig
+++ b/src/scheduler.zig
@@ -70,14 +70,16 @@ const Task = struct {
 };
 
 gpa: Allocator,
+prng: *std.Random.DefaultPrng,
 tasks: std.ArrayList(Task),
 regs: Registers,
 current_id: ?TaskID,
 current_time: u64,
 next_task_id: u64,
 
-pub fn init(self: *Scheduler, gpa: Allocator) void {
+pub fn init(self: *Scheduler, gpa: Allocator, prng: *std.Random.DefaultPrng) void {
     self.gpa = gpa;
+    self.prng = prng;
     self.tasks = .empty;
     self.current_id = null;
     self.current_time = 0;
diff --git a/src/simulator.zig b/src/simulator.zig
index 9257831..ab4ebd0 100644
--- a/src/simulator.zig
+++ b/src/simulator.zig
@@ -25,15 +25,17 @@ const ExecutableName = struct {
 };
 
 gpa: Allocator,
+prng: std.Random.DefaultPrng,
 scheduler: Scheduler,
 network: Network,
 nodes: std.ArrayList(*Node),
 executables: std.ArrayList(ExecutableName),
 real_io: std.Io,
 
-pub fn init(self: *Simulator, gpa: Allocator, real_io: std.Io) void {
+pub fn init(self: *Simulator, gpa: Allocator, real_io: std.Io, seed: u64) void {
     self.gpa = gpa;
-    self.scheduler.init(gpa);
+    self.prng = std.Random.DefaultPrng.init(seed);
+    self.scheduler.init(gpa, &self.prng);
     self.network.init(gpa);
     self.nodes = .empty;
     self.executables = .empty;