From 2a3282f872e4e415923626dbd86ce5b34b08be32 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Sun, 17 Jun 2007 20:03:31 +0000
Subject: r23533: added --option torture:targetrate=rate to target a particular
 throughput in MBytes/sec (This used to be commit
 35477e8e3d58acce467648f3bd83a43d135caefa)

---
 source4/torture/nbench/nbench.c |  7 +++++++
 source4/torture/nbench/nbio.c   | 25 ++++++++++++++++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

(limited to 'source4')

diff --git a/source4/torture/nbench/nbench.c b/source4/torture/nbench/nbench.c
index eb67e15fbb..f14da8cd15 100644
--- a/source4/torture/nbench/nbench.c
+++ b/source4/torture/nbench/nbench.c
@@ -46,6 +46,11 @@ static BOOL run_netbench(struct torture_context *tctx, struct smbcli_state *cli,
 	char *cname;
 	FILE *f;
 	BOOL correct = True;
+	double target_rate = lp_parm_double(-1, "torture", "targetrate", 0);	
+
+	if (target_rate != 0) {
+		printf("Targetting %.4f MByte/sec\n", target_rate);
+	}
 
 	if (torture_nprocs == 1) {
 		if (!read_only && !torture_setup_dir(cli, "\\clients")) {
@@ -86,6 +91,8 @@ again:
 			nbio_time_delay(targett);
 			params++;
 			i--;
+		} else if (target_rate != 0) {
+			nbio_target_rate(target_rate);
 		}
 
 		if (i < 2 || params[0][0] == '#') continue;
diff --git a/source4/torture/nbench/nbio.c b/source4/torture/nbench/nbio.c
index a382c92ceb..f093ad82b0 100644
--- a/source4/torture/nbench/nbio.c
+++ b/source4/torture/nbench/nbio.c
@@ -57,6 +57,29 @@ static struct {
 	struct timeval starttime;
 } *children;
 
+void nbio_target_rate(double rate)
+{
+	static double last_bytes;
+	static struct timeval last_time;
+	double tdelay;
+
+	if (last_bytes == 0) {
+		last_bytes = children[nbio_id].bytes;
+		last_time = timeval_current();
+		return;
+	}
+
+	tdelay = (children[nbio_id].bytes - last_bytes)/(1.0e6*rate) - timeval_elapsed(&last_time);
+	if (tdelay > 0) {
+		msleep(tdelay*1000);
+	} else {
+		children[nbio_id].max_latency = MAX(children[nbio_id].max_latency, -tdelay);
+	}
+
+	last_time = timeval_current();
+	last_bytes = children[nbio_id].bytes;
+}
+
 void nbio_time_reset(void)
 {
 	children[nbio_id].starttime = timeval_current();	
@@ -68,7 +91,7 @@ void nbio_time_delay(double targett)
 	if (targett > elapsed) {
 		msleep(1000*(targett - elapsed));
 	} else if (elapsed - targett > children[nbio_id].max_latency) {
-		children[nbio_id].max_latency = elapsed - targett;
+		children[nbio_id].max_latency = MAX(elapsed - targett, children[nbio_id].max_latency);
 	}
 }
 
-- 
cgit