Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id h0KLqSY19947 for ; Mon, 20 Jan 2003 15:52:28 -0600 X-ClientAddr: 209.68.248.164 Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id h0KLqSp19942 for ; Mon, 20 Jan 2003 15:52:28 -0600 Received: from fatcity.UUCP (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id KAA33803; Mon, 20 Jan 2003 10:35:58 -0800 (PST) Received: by fatcity.com (26-Feb-2001/v1.0g-b72/bab) via UUCP id 00534E5B; Mon, 20 Jan 2003 10:19:20 -0800 Message-ID: Date: Mon, 20 Jan 2003 10:19:20 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: "Koivu, Lisa" Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: "Koivu, Lisa" Subject: RE: 100% CPU utilization, urgent Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 72; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C2C0AF.E0048E80" ------_=_NextPart_001_01C2C0AF.E0048E80 Content-Type: text/plain; charset="iso-8859-1" Thanks Jeff for your detailed explanation. (Can I please have Unix back now???!) Have a great day. Lisa -----Original Message----- Sent: Monday, January 20, 2003 11:40 AM To: Multiple recipients of list ORACLE-L On Mon, 20 Jan 2003, Koivu, Lisa wrote: > Thomas, thanks for your post. > > However I don't see where I can match the threads on NT to what I see in > Task Manager. Am I missing something? > > To be more explicit, here's what I've got: > Lisa, The point you're missing is that Task Manager shows _processes_ and the view is showing _threads_ . They're 2 distinct constructs. In its simplest sense a thread is an independently executing 'thread of execution' from a main task. This is how you see one process for ORACLE.EXE and its running multiple threads (PMON, SMON etc) if you look at the process using a tool such as PVIEW or PSTAT. Processes are spawned using the CreateProcess() API call and a process then spins off multiple threads using another call such as AfxBeginThread() (in C++). The threads all operate independently of each other and the programmer must be careful when accessing common areas of memory simultaneously by different threads. This is why in a Dr. Watson dump you will see what each thread is doing and one or more of them will usually be running WaitForSingleObject() which is a WIN32 way of serializing access to shared _process_ memory. Contrast this to the multi-process architecture that Oracle uses on Unix. The shared memory stuctures are separate from each individual _process_ and the processes use semaphores or latches to serialize access to the external memory segment. HTH Jeff Herrick -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jeff Herrick INET: jherrick@igs.net Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). ------_=_NextPart_001_01C2C0AF.E0048E80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: 100% CPU utilization, urgent

Thanks Jeff for your detailed explanation.

(Can I please have Unix back now???!)

Have a great day.
Lisa

-----Original Message-----
From: Jeff Herrick [mailto:jherrick@igs.net]
Sent: Monday, January 20, 2003 11:40 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: 100% CPU utilization, urgent




On Mon, 20 Jan 2003, Koivu, Lisa wrote:

> Thomas, thanks for your post.
>
> However I don't see where I can match the = threads on NT to what I see in
> Task Manager.  Am I missing = something?
>
> To be more explicit, here's what I've = got:
>

Lisa,

The point you're missing is that Task Manager shows = _processes_ and
the view is showing _threads_ . They're 2 distinct = constructs.  In its
simplest sense a thread is an independently = executing 'thread of
execution' from a main task. This is how you see one = process for
ORACLE.EXE and its running multiple threads (PMON, = SMON etc)
if you look at the process using a tool such as = PVIEW or PSTAT.

Processes are spawned using the CreateProcess() API = call and a process
then spins off multiple threads using another call = such as
AfxBeginThread() (in C++). The threads all operate = independently
of each other and the programmer must be careful = when accessing
common areas of memory simultaneously by different = threads. This is
why in a Dr. Watson dump you will see what each = thread is doing
and one or more of them will usually be running = WaitForSingleObject()
which is a WIN32 way of serializing access to shared = _process_
memory.

Contrast this to the multi-process architecture that = Oracle uses
on Unix. The shared memory stuctures are separate = from each
individual _process_ and the processes use = semaphores or
latches to serialize access to the external memory = segment.

HTH

Jeff Herrick

--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Jeff Herrick
  INET: jherrick@igs.net

Fat City Network Services    -- = 858-538-5051 http://www.fatcity.com
San Diego, = California        -- Mailing list = and web hosting services
---------------------------------------------------------------= ------
To REMOVE yourself from this mailing list, send an = E-Mail message
to: ListGuru@fatcity.com (note EXACT spelling of = 'ListGuru') and in
the message BODY, include a line containing: UNSUB = ORACLE-L
(or the name of mailing list you want to be removed = from).  You may
also send the HELP command for other information = (like subscribing).

------_=_NextPart_001_01C2C0AF.E0048E80-- -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Koivu, Lisa INET: Lisa.Koivu@efairfield.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).