usr/src/cmd/dtrace/test/tst/common/rates/tst.switchrate.d

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * ASSERTION:
  31  *   If the switch rate is set properly, there should be no drops.
  32  *
  33  * SECTION: Buffers and Buffering/switch Policy;
  34  *      Options and Tunables/bufsize;
  35  *      Options and Tunables/switchrate
  36  */
  37
  38 /*
  39  * We rely on the fact that at least 8 bytes must be stored per iteration
  40  * (EPID plus data), but that no more than 40 bytes are stored per iteration.
  41  * We are going to let this run for ten seconds.  If the switch rate
  42  * is being set properly, there should be no drops.  Note that this test
  43  * (regrettably) may be scheduling sensitive -- but it should only fail on
  44  * the most pathological systems.
  45  */
  46 #pragma D option bufsize=40
  47 #pragma D option switchrate=10msec
  48 #pragma D option quiet
  49
  50 int n;
  51
  52 tick-100msec
  53 /n < 100/
  54 {
  55         printf("%10d\n", n++);
  56 }
  57
  58 tick-100msec
  59 /n == 100/
  60 {
  61         exit(0);
  62 }