From owner-freebsd-java@FreeBSD.ORG  Sun Sep 16 03:05:09 2007
Return-Path: <owner-freebsd-java@FreeBSD.ORG>
Delivered-To: freebsd-java@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 894F116A417;
	Sun, 16 Sep 2007 03:05:09 +0000 (UTC)
	(envelope-from lists@intricatesoftware.com)
Received: from mail1.intricatesoftware.com (cl-18.ewr-01.us.sixxs.net
	[IPv6:2001:4830:1200:11::2])
	by mx1.freebsd.org (Postfix) with ESMTP id 2348813C457;
	Sun, 16 Sep 2007 03:05:09 +0000 (UTC)
	(envelope-from lists@intricatesoftware.com)
Received: from seraph.intricatesoftware.com
	(relay@localhost.intricatesoftware.com [IPv6:::1])
	by mail1.intricatesoftware.com (8.14.1/8.13.4) with ESMTP id
	l8G355nK021833; Sat, 15 Sep 2007 23:05:06 -0400 (EDT)
Received: from seraph.intricatesoftware.com
	(truk@localhost.intricatesoftware.com [127.0.0.1])
	by seraph.intricatesoftware.com (8.14.1/8.14.1) with ESMTP id
	l8G356Zp030484; Sat, 15 Sep 2007 23:05:06 -0400 (EDT)
Received: (from truk@localhost)
	by seraph.intricatesoftware.com (8.14.1/8.14.1/Submit) id
	l8G356SB025431; Sat, 15 Sep 2007 23:05:06 -0400 (EDT)
X-Authentication-Warning: seraph.intricatesoftware.com: truk set sender to
	lists@intricatesoftware.com using -f
From: Kurt Miller <lists@intricatesoftware.com>
To: freebsd-java@freebsd.org
Date: Sat, 15 Sep 2007 23:05:05 -0400
User-Agent: KMail/1.9.7
References: <46EC1B55.4060202@FreeBSD.org>
	<200709152250.50879.kurt@intricatesoftware.com>
In-Reply-To: <200709152250.50879.kurt@intricatesoftware.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200709152305.06116.lists@intricatesoftware.com>
X-SMTP-Vilter-Version: 1.3.6
X-SMTP-Vilter-Virus-Backend: clamd
X-SMTP-Vilter-Status: clean
X-SMTP-Vilter-clamd-Virus-Status: clean
X-Spamd-Symbols: ALL_TRUSTED
X-SMTP-Vilter-Spam-Backend: spamd
X-Spam-Score: -1.4
X-Spam-Threshold: 5.0
X-Spam-Probability: -0.3
X-Its-A-Nuisance: This is spam
X-SMTP-Vilter-Unwanted-Backend: attachment
X-SMTP-Vilter-attachment-Unwanted-Status: clean
Cc: Kris Kennaway <kris@freebsd.org>, performance@freebsd.org
Subject: Re: Massive performance loss from OS::sleep hack
X-BeenThere: freebsd-java@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: kurt@intricatesoftware.com
List-Id: Porting Java to FreeBSD <freebsd-java.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-java>,
	<mailto:freebsd-java-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-java>
List-Post: <mailto:freebsd-java@freebsd.org>
List-Help: <mailto:freebsd-java-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-java>,
	<mailto:freebsd-java-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 16 Sep 2007 03:05:09 -0000

On Saturday 15 September 2007 10:50:50 pm Kurt Miller wrote:
> The following are programs I wrote when I isolated the problem.
> If the c program runs ok on 7.0 for both single cpu and mp then
> remove the os_sleep() and try the java program. If that works too
> then you're clear to make the os_sleep() hack only apply to <
> 7.0 and still be able to pass the certification tests.

Sorry copy/paste glitch. He is the c program again:

#include <pthread.h>
#include <unistd.h>
#include <signal.h>
#include <inttypes.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

volatile int init=0;
volatile int interrupt=0;

static void *
yielder(void *arg)
{
    init = 1;
    while (1) {
        pthread_yield();
    }
}

static void
sighandler(int sig)
{
    interrupt = 1;
    printf("sighandler\n");
}

static void
waitForInit() {
    struct timespec t, rt;

    while (init == 0) {
        t.tv_sec = 0;
        t.tv_nsec = 100000;
        nanosleep(&t, &rt);
    }
}

static void
waitForInterrupt() {
    struct timespec t, rt;

    while (interrupt == 0) {
        t.tv_sec = 0;
        t.tv_nsec = 100000;
        nanosleep(&t, &rt);
    }
}

int
main(int argc, char *argv[])
{
    pthread_t        yldr;
    pthread_attr_t   attr;
    struct sigaction act;

    /* Install a signal handler for SIGUSR1 */
    sigemptyset (&act.sa_mask);
    sigaddset (&act.sa_mask, SIGUSR1);
    act.sa_handler = sighandler;
    act.sa_flags = 0;
    sigaction (SIGUSR1, &act, NULL);

    pthread_attr_init(&attr);
    pthread_attr_setschedpolicy(&attr, SCHED_FIFO);

    pthread_create(&yldr, &attr, yielder, NULL);
    pthread_setprio(yldr, 16);
    waitForInit();
    if(pthread_kill(yldr, SIGUSR1) != 0)
        printf("pthread_kill failed with errno = %d\n", errno);
    waitForInterrupt();
}