Updated the disk read test to use fio instead of dd; added new test for 4k random reads (previous test was for sequential reads)

src/main.rs

@@ -28,9 +28,20 @@ struct Disk {
 
 #[derive(Subcommand)]
 enum DiskCommands {
-    // disk read subcommand
-    #[clap(name = "read-test", about = "Read from /dev/zero to determine sequential disk read speeds.")]
-    ReadTest {
+    // sequential disk read subcommand
+    #[clap(name = "read_seq", about = "Sequential disk read speed test.")]
+    ReadSeqTest {
+        #[clap(short = 'f', default_value_t = String::from("/tmp/disk-test.tmp"))]
+        tempfile: String,
+        #[clap(short = 's', default_value_t = 15)]
+        size: u8,
+    },
+
+    // random disk read subcommand
+    #[clap(name = "read_rand", about = "Random 4K disk read speed test.")]
+    ReadRandTest {
+        #[clap(short = 'f', default_value_t = String::from("/tmp/disk-test.tmp"))]
+        tempfile: String,
         #[clap(short = 's', default_value_t = 15)]
         size: u8,
     },
@@ -78,7 +89,8 @@ fn main() {
     // map subcommands back to the main command
     match &cli.command {
         Commands::Disk(args) => match &args.disk_commands {
-            DiskCommands::ReadTest { size } => tests::disk::disk_read_test(size),
+            DiskCommands::ReadSeqTest { tempfile, size } => tests::disk::disk_read_seq_test(tempfile, size),
+            DiskCommands::ReadRandTest { tempfile, size } => tests::disk::disk_read_rand_test(tempfile, size),
             DiskCommands::WriteTest { tempfile, size } => tests::disk::disk_write_test(tempfile, size),
         }
 

src/tests/disk.rs

@@ -1,31 +1,58 @@
 use std::fs;
 use std::process::Command;
 
-// test disk read speeds by reading for /dev/zero and writing it to /dev/null
-pub fn disk_read_test(size: &u8) {
-    // convert size in Gigabytes down to Megabytes
-    let size_gigs: u32 = (*size as u32 * 1024 * 8).into();
-
-    // run sync to clear out any disk caches prior to running
-    Command::new("sync");
-
-    // run the dd command
-    let output = Command::new("dd")
-        .arg("bs=128k")
-        .arg(format!("count={}", size_gigs))
-        .arg("if=/dev/zero")
-        .arg("of=/dev/null")
+// test disk sequential read speeds w/ fio
+pub fn disk_read_seq_test(tempfile: &str, size: &u8) {
+    // run the fio command
+    let output = Command::new("fio")
+        .arg("--name=TEST")
+        .arg(format!("--filename={}", tempfile))
+        .arg("--rw=read")
+        .arg("--size=2g")
+        .arg(format!("--io_size={}g", size))
+        .arg("--blocksize=1024k")
+        .arg("--ioengine=libaio")
+        .arg("--fsync=10000")
+        .arg("--iodepth=32")
+        .arg("--direct=1")
+        .arg("--numjobs=1")
+        .arg("--runtime=60")
+        .arg("--group_reporting")
         .output()
         .expect("Failed to execute command");
 
     // check that the command succeeded
     assert!(output.status.success());
 
-    // dd's output ends up in stderr
-    println!("{}", String::from_utf8_lossy(&output.stderr));
+    // print the test's output
+    println!("{}", String::from_utf8_lossy(&output.stdout));
+}
 
-    // run another sync to clear out the disk's cache
-    Command::new("sync");
+// test disk 4K random read speeds w/ fio
+pub fn disk_read_rand_test(tempfile: &str, size: &u8) {
+    // run the fio command
+    let output = Command::new("fio")
+        .arg("--name=TEST")
+        .arg(format!("--filename={}", tempfile))
+        .arg("--rw=randread")
+        .arg("--size=2g")
+        .arg(format!("--io_size={}g", size))
+        .arg("--blocksize=4k")
+        .arg("--ioengine=libaio")
+        .arg("--fsync=1")
+        .arg("--iodepth=32")
+        .arg("--direct=1")
+        .arg("--numjobs=1")
+        .arg("--runtime=60")
+        .arg("--group_reporting")
+        .output()
+        .expect("Failed to execute command");
+
+    // check that the command succeeded
+    assert!(output.status.success());
+
+    // print the test's output
+    println!("{}", String::from_utf8_lossy(&output.stdout));
 }
 
 // test disk write speeds by continually writing zeroes to it