sanitize parallelism

roles/test-utils/mining-device/src/lib/mod.rs

@@ -9,6 +9,7 @@ use std::{
         Arc,
     },
     time::Duration,
+    thread::available_parallelism
 };
 use tokio::net::TcpStream;
 
@@ -198,8 +199,7 @@ fn open_channel(device_id: Option<String>, nominal_hashrate_multiplier: Option<f
     let user_identity = device_id.unwrap_or_default().try_into().unwrap();
     let id: u32 = 10;
     info!("Measuring CPU hashrate");
-    let p = std::thread::available_parallelism().unwrap().get() as u32 - 3;
-    let measured_hashrate = measure_hashrate(5, handicap) as f32 * p as f32;
+    let measured_hashrate = measure_hashrate(5, handicap) as f32;
     info!("Measured CPU hashrate is {}", measured_hashrate);
     let nominal_hash_rate = match nominal_hashrate_multiplier {
         Some(m) => {
@@ -640,7 +640,13 @@ fn measure_hashrate(duration_secs: u64, handicap: u32) -> f64 {
     }
 
     let elapsed_secs = start_time.elapsed().as_secs_f64();
-    hashes as f64 / elapsed_secs
+    let hashrate_single_thread = hashes as f64 / elapsed_secs;
+
+    // we just measured for a single thread, need to multiply by the available parallelism
+    let p = available_parallelism().unwrap().get();
+
+
+    hashrate_single_thread * p as f64
 }
 fn generate_random_32_byte_array() -> [u8; 32] {
     let mut rng = thread_rng();
@@ -657,11 +663,7 @@ fn start_mining_threads(
     tokio::task::spawn(async move {
         let mut killers: Vec<Arc<AtomicBool>> = vec![];
         loop {
-            let available_parallelism = u32::max(
-                2,
-                std::thread::available_parallelism().unwrap().get() as u32,
-            );
-            let p = available_parallelism - 1;
+            let p = available_parallelism().unwrap().get() as u32;
             let unit = u32::MAX / p;
             while have_new_job.recv().await.is_ok() {
                 while let Some(killer) = killers.pop() {