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POWhy foreground process is faster than background process in UNIX server
 

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  1. POWhy foreground process is faster than background process in UNIX server
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    <p>We have Java application which we will be running on a UNIX server. To run it in the foreground we use below code and place it in file</p> <pre><code>#! /bin/ksh /usr/java14_64/bin/java -classpath /clocal/mptsgrp/user/mptsuser/configcfa/classes:/clocal/mptsgrp/user/mptsuser/configcfa/mqjavalib/xerces.jar::$CLASSPATH -Djava.library.path=/usr/lpp/mqm/lib:/clocal/udb/db2inst1/sqllib/java/sqlj.zip:/clocal/udb/db2inst1/sqllib/java/db2qgjava.jar:/clocal/udb/db2inst1/sqllib/java/Common.jar:/clocal/udb/db2inst1/sqllib/java/db2umplugin.jar:/clocal/udb/db2inst1/sqllib/java/db2policy.jar:/clocal/udb/db2inst1/sqllib/java/db2dbgm.jar:/clocal/udb/db2inst1/sqllib/java/db2jcc_license_cu.jar:/clocal/udb/db2inst1/sqllib/java/db2jcc_javax.jar:/clocal/udb/db2inst1/sqllib/java/db2java.zip:/clocal/udb/db2inst1/sqllib/java/db2jcc.jar:/usr/mqm/java/lib:/clocal/udb/db2inst1/sqllib/lib:/clocal/mptsgrp/user/mptsuser/mqjavalib:/clocal/mptsgrp/user/mptsuser/mqjavalib/com.ibm.mq.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib/com.ibm.mqbind.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib/com.ibm.mqjms.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib/jms.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib -Dcfa.config.file=/clocal/mptsgrp/user/mptsuser/configcfa/9hpcfa3/config/build_9hpcfa3.properties -Xms16m -Xmx64m Main </code></pre> <p>To run from background we use below code and place it in file:</p> <pre><code>#! /bin/ksh nohup /usr/java14_64/bin/java -classpath /clocal/mptsgrp/user/mptsuser/configcfa/classes:/clocal/mptsgrp/user/mptsuser/configcfa/mqjavalib/xerces.jar::$CLASSPATH -Djava.library.path=/usr/lpp/mqm/lib:/clocal/udb/db2inst1/sqllib/java/sqlj.zip:/clocal/udb/db2inst1/sqllib/java/db2qgjava.jar:/clocal/udb/db2inst1/sqllib/java/Common.jar:/clocal/udb/db2inst1/sqllib/java/db2umplugin.jar:/clocal/udb/db2inst1/sqllib/java/db2policy.jar:/clocal/udb/db2inst1/sqllib/java/db2dbgm.jar:/clocal/udb/db2inst1/sqllib/java/db2jcc_license_cu.jar:/clocal/udb/db2inst1/sqllib/java/db2jcc_javax.jar:/clocal/udb/db2inst1/sqllib/java/db2java.zip:/clocal/udb/db2inst1/sqllib/java/db2jcc.jar:/usr/mqm/java/lib:/clocal/udb/db2inst1/sqllib/lib:/clocal/mptsgrp/user/mptsuser/mqjavalib:/clocal/mptsgrp/user/mptsuser/mqjavalib/com.ibm.mq.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib/com.ibm.mqbind.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib/com.ibm.mqjms.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib/jms.jar:/clocal/mptsgrp/user/mptsuser/mqjavalib -Dcfa.config.file=/clocal/mptsgrp/user/mptsuser/configcfa/9hpcfa3/config/build_9hpcfa3.properties -Xms16m -Xmx64m Main 1&gt; /dev/null &amp; </code></pre> <p>In our application we are not sure but the background process seems 20-30% slower when processing data compared to the foreground process. We will be writing lot of information into log.</p>
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    1. USJohn Kugelman
    1. USuser2936008
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      1. POWhy foreground process is faster than background process in UNIX server
      1. USuser2936008
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    1. COThe only relevant difference I see is that you don't actually do any IO in the "background" case: all output of your application is simply discarded, while in the other case you say you "place it in a file": that takes time, especially if there's a lot of it.
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      1. POWhy foreground process is faster than background process in UNIX server
      1. USJoachim Sauer
    2. COboth FG and BG processs are placed in the file and ran expicitly, How to do IO sorry i am new to unix so am asking , Please explain how to use IO such that java program runs fast . but again why is Back ground is slow compared to forground
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      1. POWhy foreground process is faster than background process in UNIX server
      1. USuser2936008
    3. COOk, and how do you call them? What happens with the output in the foreground case? Does it get printed to the terminal? Then you've got your problem: the terminal is slowing down your application.
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      1. POWhy foreground process is faster than background process in UNIX server
      1. USJoachim Sauer
 

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