improved benchmark accuracy

gbcs-cli/src/main/kotlin/net/woggioni/gbcs/cli/impl/commands/BenchmarkCommand.kt

@@ -81,6 +81,8 @@ class BenchmarkCommand : GbcsCommand() {
                             semaphore.release()
                             completionCounter.incrementAndGet()
                         }
+                    } else {
+                        Thread.sleep(0)
                     }
                 }
 
@@ -103,9 +105,10 @@ class BenchmarkCommand : GbcsCommand() {
                 val completionCounter = AtomicLong(0)
                 val semaphore = Semaphore(profile.maxConnections * 3)
                 val start = Instant.now()
-                entries.forEach { entry ->
-                    semaphore.acquire()
-
+                val it = entries.iterator()
+                while (completionCounter.get() < entries.size) {
+                    if (it.hasNext()) {
+                        val entry = it.next()
                         val future = client.get(entry.first).thenApply {
                             if (it == null) {
                                 log.error {
@@ -121,6 +124,9 @@ class BenchmarkCommand : GbcsCommand() {
                             completionCounter.incrementAndGet()
                             semaphore.release()
                         }
+                    } else {
+                        Thread.sleep(0)
+                    }
                 }
                 val end = Instant.now()
                 log.info {