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<!--___INFO__MARK_BEGIN__
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the Sun Industry Standards Source License Version 1.2
*
* Sun Microsystems Inc., March, 2001
*
*
* Sun Industry Standards Source License Version 1.2
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.2 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://gridengine.sunsource.net/Gridengine_SISSL_license.html
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2001 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
************************************************************************/
___INFO__MARK_END__-->
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Author" content="christian reissmann">
<meta name="GENERATOR" content="Mozilla/4.76C-CCK-MCD Netscape [en] (X11; U; SunOS 5.8 sun4u) [Netscape]">
</head>
<body>
<h1>
<a NAME="General client implementation"></a>General client implementation</h1>
<p><br><img SRC="GDI_request_flow.gif" height=383 width=575 align=BOTTOM>
<br>
<p>All Grid Engine client applications look very similar, because they
are using the GDI interface <font color="#000000">(see </font> <a href="../libs/gdi/gdi.html">gdi.html</a><font color="#000000">)</font>to
send<font color="#000000"> requests </font>to the qmaster daemon. This
is a typical client/server interface, where the qmaster is the server.
Each client can use the function sge_gdi() to send<font color="#000000">
a request to the qmaster. The qmaster will check a received request
for its correctness and will perfom the specified actions. The client will
receive a status notification after processing the client request through
the qmaster.</font>
<p>The GDI interface is designed to exchange data lists between the clients
and the qmaster. All Grid Engine lists are so called <a href="#cull list">cull
lists</a> . You can interpret such a list as <font color="#000000">an o</font>bject,
such as for instance the job list, which defines a submitted job. All job
related data is stored in this list. Other examples are the queue list
for queue objects or for cluster configurations the cluster configuration
list. All Grid Engine relevant data is stored in <a href="#cull list">cull
lists</a> and all data is managed by the qmaster.
<p>The GDI interface can handle four main operations:
<blockquote>
<ol>
<li>
<tt>SGE_GDI_GET -</tt> Get a object list from the qmaster</li>
<li>
<tt>SGE_GDI_ADD -</tt> Add a new object list ( e.g. new job(list), new
queue(list) )</li>
<li>
<tt>SGE_GDI_DEL -</tt> Delete an object at the qmaster</li>
<li>
<tt>SGE_GDI_MOD -</tt> Modify an object at the qmaster</li>
</ol>
</blockquote>
For further details on the GDI please refer to <font color="#000000">(see
</font><a href="../libs/gdi/gdi.html">gdi.html</a><font color="#000000">
) and The GDI section (section 3) in the Grid Engine reference manual.</font>
<p>The qmaster handles the client requests through the GDI interface in
the qmaster function sge_c_gdi() which is implemented in the file gridengine/source/daemons/qmaster/sge_c_gdi.c.
The client GDI interface is implemented in the gdi lib (file gridengine/source/libs/gdi/sge_gdi_request.c).
<p>The sge_c_gdi() function itself is called from the qmaster when a new
GDI request arrives. The qmaster main loop (while (TRUE) {}) is implemented
in the file /gridengine/source/daemons/qmaster/qmaster.c. Here the master
reacts on so called tags. One tag is e.g. TAG_GDI_REQUEST which indicates
to enter the GDI request function sge_c_gdi().
<p>In order to setup the connection to the qmaster each client will perform
a <a href="#general client setup">general client setup</a>. After that,
command line parameters are parsed. Now a client will generate a GDI request
depending on the client and on the options given to the client. The qsub
client, for instance, will generate a new job list and will use the SGE_GDI_ADD
functionallity of the sge_gdi() call to send the new job object to the
qmaster. The qdel client, on the other hand, will use the SGE_GDI_DEL functionallity
to tell the qmaster that a particular job object should get deleted at
the qmaster.
<p>
<hr WIDTH="100%">
<h1>
special - clients</h1>
<h2>
<a NAME="qrsh"></a><font size=+1><a href="qrsh/qrsh.html#qrsh_dokument">qrsh
and qlogin</a> - Grid Engine rsh and login integration</font></h2>
<h2>
<a NAME="qmake"></a><font size=+1><a href="../3rdparty/qmake/qmake.html">qmake</a>
- Grid Engine parallel make integration</font></h2>
<h2>
<a NAME="qsh"></a><font size=+1><a href="qsh/qsh.html">qsh</a> - Grid Engine
sh integration</font></h2>
<h2>
<a NAME="qtcsh"></a><font size=+1><a href="../3rdparty/qtcsh/qtcsh.html">qtcsh</a>
- Grid Engine tcsh integration</font></h2>
<h2>
<hr WIDTH="100%"></h2>
<h1>
job - related clients</h1>
<h2>
<hr WIDTH="100%"></h2>
<h2>
<a NAME="qsub"></a><font size=+1>qsub - submit jobs</font></h2>
This client program is used to submit job scripts. Please read the
man page for a functional overview. This client is implemented in the way
described in <a href="#General client implementation">general client implementation.</a>
<br>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qsub/qsub.c</i>.
It contains the steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
The qsub command will interpret additional default switches from the
<a href="#default files">default
files</a> as command arguments. These switches are generally used when
a job is submitted. The default switches are simply added to the ones which
are from the command line. All parameters from the command line are stored
into a <a href="#cull list">cull list</a> of the type SPA_Type.</ol>
4. Create a new job list
<ol>
<ol> </ol>
The function <b>cull_parse_job_parameter()</b> (file: <i>gridengine/source/common/parse_job_cull.c</i>
) creates a job object in accordance with the command line parameters.</ol>
5. Send job list to qmaster
<ol>
<ol> </ol>
Every job is represented by a job list at the qmaster. In order to send
the new generated job to the qmaster the <b>sge_gdi()</b> function (file:
<i>gridengine/source/libs/gdi/sge_gdi_request.c</i>
) is used.</ol>
6. Analyze answer from qmaster</ol>
<hr WIDTH="100%">
<h2>
<a NAME="qresub"></a><font size=+1>qresub - submit a copy of an existing
job</font></h2>
This client program is used to submit a new job with the same parameters
as an already pending or running job. Please read the corresponding man
page for a functional overview. This client is a file link to the <a href="#qalter">qalter</a>
client. The qalter client will react in an different way when its invocation
name is "qresub". This client is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the progam can be found in in the file <i>gridengine/source/clients/qalter/qalter.c</i>.
It contains the steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Create a request list
<ol>This list will contain all changes needed by qmaster to submit a job
copy. For qresub this is only the job id of the job which should be copied.</ol>
5. Send GDI request to qmaster
<ol>
<ol> </ol>
The client will now send the request list which includs the job id of the
job (which should be copied) to the qmaster. For this action the GDI interface
operation SGE_GDI_COPY is used when calling the <b>sge_gdi()</b> function
(file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i> ).
<ol> </ol>
</ol>
6. Analyze answer from qmaster</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qalter"></a><font size=+1>qalter - modify submitted jobs</font></h2>
This client program is used to modify already pending or running jobs.
Please read the corresponding man page for a functional overview. This
client is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qalter/qalter.c</i>.
It contains the following steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Create a request list
<ol>This list will contain all changes needed by qmaster to manipulate
the existing job.</ol>
<ol>
<ol> </ol>
</ol>
5. Send GDI request to qmaster
<ol>
<ol> </ol>
The client will now send the request list which includs the job id of the
job (which should be modified) and all desired modifications to the qmaster.
For this action the GDI interface operation SGE_GDI_MOD is used when calling
the <b>sge_gdi()</b> function (file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i>
).
<ol> </ol>
</ol>
6. Analyze answer from qmaster</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qdel"></a><font size=+1>qdel - delete jobs</font></h2>
This client program is used to delete pending or running jobs. Please read
the corresponding man page for a functional overview. This client is implemented
in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summarization</u></b>
<p>The main function fof the program can be found in the file <i>gridengine/source/clients/qdel/qdel.c</i>.
It contains the following steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol> </ol>
2. <a href="#general client setup">General client setup</a>
<ol> </ol>
3. Read in all command line options
<ol>
<br>All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Generate a job list
<br>
<ol>The job list contains the job id(s) to be deleted.</ol>
5. Send GDI request to qmaster
<ol>
<br>The client will now send the job list which includs the job id(s) of
the job(s) (which should be deleted) to the qmaster. For this action the
GDI interface operation SGE_GDI_DEL is used when calling the <b>sge_gdi()</b>
function (file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i> ).</ol>
6. Analyze answer from qmaster</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qhold"></a><font size=+1>qhold - hold back jobs from execution</font></h2>
This client program is used to set pending or running jobs into hold state.
Please read the corresponding man page for a functional overview. This
command is no new client binary. It is only a shell script which is using
the <a href="#qalter">qalter</a> client to modify a job.
<br>
<p>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qrls"></a><font size=+1>qrls - release jobs from previous hold
state</font></h2>
This client program is used to release pending or running jobs from hold
state. Please read the corresponding man page for a functional overview.
This command is no new client binary. It is only a shell script which is
using the <a href="#qalter">qalter</a> client to modify a job.
<br>
<p>
<hr WIDTH="100%">
<h1>
accounting - related clients</h1>
<h2>
<a NAME="qacct"></a><font size=+1>qacct - get accounting information for
completed jobs</font></h2>
This client program is used as reporting and accounting tool. Please read
the corresponding man page for a functional overview. This client is implemented
in the way described in <a href="#General client implementation">general
client implementation.</a>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qacct/qacct.c</i>.
It contains the following steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Send GDI request(s) to qmaster
<ol>
<ol> </ol>
The client will retrieve diverse data from the qmaster. For this action
the GDI interface operation SGE_GDI_GET is used when calling the <b>sge_gdi()</b>
function (file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i> ).
<ol> </ol>
</ol>
5. Analyze answer from qmaster and display accounting information.
<p>6. Repeat the last two steps for different data calls.</ol>
<hr WIDTH="100%">
<h1>
queue - related clients</h1>
<h2>
<a NAME="qconf"></a><font size=+1>qconf - add, remove, modify or show Grid
Engine configurations</font></h2>
This client program is the main command-line administrative interface for
Grid Engine. Please read the corresponding man page for a functional overview.
This client is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qconf/qconf.c</i>.
It contains the following steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. If neccessary get configuration lists from qmaster
<ol>Get e.g. queue configuration list ( with SGE_GDI_GET call )</ol>
5. If neccessary Manipulate the lists
<ol>Change list attributes</ol>
6. Send manipulated list back to qmaster ( with e.g. SGE_GDI_MOD call )
<ol>
<ol> </ol>
The client will send one or more requests to the qmaster. To perform this,
diverse GDI interface operations are used when calling the <b>sge_gdi()</b>
function (file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i> ).
<ol> </ol>
</ol>
7. Alternatively to the 3 steps above new objects can be created or existing
objects can be deleted
<p>8. Analyze answer from qmaster</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qmod"></a><font size=+1>qmod - modify queue status</font></h2>
This client program is used to modify the status of existing queues. Please
read the corresponding man page for a functional overview. This client
is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qmod/qmod.c.</i>
It contains the steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Generate SGE_QUEUE_LIST
<p>5. Send GDI request to qmaster
<ol>
<ol> </ol>
The client will send the request list to the qmaster. For this action the
GDI interface operation SGE_GDI_TRIGGER is used when calling the <b>gdi_qmod()</b>
function (file: <i>gridengine/source/libs/gdi/gdi_qmod.c</i> ).
<ol> </ol>
</ol>
6. Analyze answer from qmaster</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h1>
general - related clients</h1>
<h2>
<a NAME="qhost"></a><font size=+1>qhost - get information about hosts,
queues or jobs</font></h2>
This client program is used to get information about the Grid Engine Cluster.
Please read the corresponding man page for a functional overview. This
client is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qhost/qhost.c</i>.
It contains the steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Send GDI request(s) to qmaster
<ol>
<ol> </ol>
The client will retrieve diverse data from the qmaster. For this action
the GDI interface operation SGE_GDI_GET is used when calling the <b>sge_gdi()</b>
function (file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i> ).
<ol> </ol>
</ol>
5. Analyze answer from qmaster and display results</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qselect"></a><font size=+1>qselect - get queue names which match
given request</font></h2>
This client program is used to get queue names which match search patterns.
Please read the man corresponding page for a functional overview. This
client is a file link to the <a href="#qstat">qstat</a> client. The qstat
client will react in an different way when its program name is "qselect".
This client is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="qstat"></a><font size=+1>qstat - show status of jobs and queues</font></h2>
This client program is used get information about jobs and/or queues. Please
read the corresponding man page for a functional overview. This client
is implemented in the way described in <a href="#General client implementation">general
client implementation.</a>
<br>
<p><b><u>Functional summary</u></b>
<p>The main function of the program can be found in the file <i>gridengine/source/clients/qstat/qstat.c</i>.
It contains the steps:
<ol>1. <a href="#Setup I18N">Setup internationalization</a>
<ol>
<ol> </ol>
</ol>
2. <a href="#general client setup">General client setup</a>
<ol>
<ol> </ol>
</ol>
3. Read in all command line options
<ol>
<ol> </ol>
All parameters from the command line are stored into a <a href="#cull list">cull
list</a> of the type SPA_Type.</ol>
4. Send GDI request(s) to qmaster
<ol>
<ol> </ol>
The client will retrieve diverse data from the qmaster. For this action
the GDI interface operation SGE_GDI_GET is used when calling the <b>sge_gdi()</b>
function (file: <i>gridengine/source/libs/gdi/sge_gdi_request.c</i> ).
<ol> </ol>
</ol>
5. Analyze answer from qmaster and display results.</ol>
<p><br>
<hr WIDTH="100%">
<br>
<h2>
<a NAME="general client setup"></a><font size=+1>general client setup</font></h2>
<p><br>The following function calls are made in each client before starting
any other action. Please do not mix up the call order.
<br>
<p>sge_setup()
<blockquote>
<li>
set program name and path variables</li>
<li>
check for sanity</li>
</blockquote>
prepare_enroll()
<ul>
<li>
initialize security module</li>
<li>
setup communication library parameters</li>
</ul>
install_exit_func()
<blockquote>
<li>
set function pointer to an exit function</li>
</blockquote>
lInit()
<blockquote>
<li>
initialze list library (cull) name space</li>
</blockquote>
setup_sig_handlers()
<blockquote>
<li>
setup signal masks and handler functions</li>
</blockquote>
<hr WIDTH="100%">
<h2>
<a NAME="default files"></a><font size=+1>default files</font></h2>
Default files are read and processed during job submission before any submit
option embedded in the job script and before any option in the qsub or
qsh command line are considered. This means the options written into this
file are automatically added to the command line on each qsub call. Please
read the manual page "sge_request" for more information.
<br>
<p>
<hr WIDTH="100%">
<h2>
<a NAME="cull list"></a><font size=+1>cull list</font></h2>
All Grid Engine internal data (jobs, queues, hosts, etc.) are stored in
so called <a href="../libs/cull/cull.html">cull</a> (Common Usable List
Library) list.
<p>The cull defines different list and data types. Each list entry can
be accessed by name or position. Also sublists are allowed. Here are some
defined list specifiers:
<ul>
<li>
SGE_JOB_LIST - job list</li>
<li>
SGE_QUEUE_LIST - queue list</li>
<li>
SGE_CKPT_LIST - checkpointing object list</li>
<li>
....</li>
</ul>
<hr WIDTH="100%">
<h2>
<a NAME="Setup I18N"></a><font size=+1>Setup internationalization</font></h2>
In order to have the possibility to internationalize the Grid Engine messages,
one of the first things to do at startup of a client application is to
setup the internationalization function. The function install_language_func()
is used to set up a message wrapper. If the Grid Engine system is linked
with the gettext library, this function if called with the original (english)
message, will return the localized message from a message catalouge. The
_() macro is set to this function. Every message put into this macro (between
the brackets) can be localized. All localized messages are defined as a
macro in the msg_x.h files.
<br>
<br>
<br>
<br>
<center>
<p>Copyright 2001 Sun Microsystems, Inc. All rights reserved.</center>
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