On Wed, Jul 15, 2015 at 04:51:47PM +0530, P. S. Mukhopadhyay wrote: > Thanks for you kind response and advices. I tried your suggestions and > succeeded to overcome the problem. I took following steps: > > edited /etc/default/tomcat7 file and entered : > > JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms1536m > -Xmx1536m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m > -XX:MaxPermSize=256m -XX:+DisableExplicitGC" > > It's working now. But I do have a question. I'm running this test dspace in > a machine with 1 GB physical RAM. Is this setting of JAVA_OPTS is right?
Right or wrong would be a local judgment, dependent on your load and your performance expectations. On a machine with 1GB physical, -Xms1536m will allow the JVM to request substantially more memory than is physically present. That can result in swapping, which will make response slower. If the amount of slow-down is acceptable then this is a reasonable configuration. If not, I'd recommend adding at least another 1GB. What I would do (and have done) is to install a resource monitor such as Psi Probe and examine Tomcat's use of memory regularly, making adjustments until it runs well with an every-day load and has some room to expand if there is a sudden great interest in your content. I try to size the physical machine to avoid swapping, but a small amount of swapping will not do noticeable harm to performance. On the other hand, I try not to give Tomcat more memory than it really needs for regular work and occasional demand spikes. -- Mark H. Wood Lead Technology Analyst University Library Indiana University - Purdue University Indianapolis 755 W. Michigan Street Indianapolis, IN 46202 317-274-0749 www.ulib.iupui.edu
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