On Tue, May 20, 2014 at 11:33:48AM +0300, Alan Orth wrote: > I'm curious if anyone sets memory limits for DSpace's various cron jobs?
As delivered, DSpace does that itself. In bin/dspace, around line 69, the script sets a maximum heap size of 256 MB, *unless* you already have JAVA_OPTS set. One thing you might check is whether there is already a JAVA_OPTS value which sets substantially higher limits for any of Java's memory pools. > Lately we've been having Tomcat's java process get killed every morning > around the same time, and all dmesg shows is that "java" was killed by > the kernel's OOM killer. Catalina logs don't show any "SEVERE" errors, > so I have to assume it's the cron jobs which are using up loads of > memory and then confusing the kernel, which then identifies Tomcat's > java as the memory hog and kills it. The kernel's notion of the best candidate for the OOM Killer probably has less to do with fixing blame than with recovering a big hunk of memory, making Tomcat a tempting target no matter which process you think is at fault. > So I'm just curious if anyone has had these kinds of problems, and > if/what they set their JAVA_OPTS to in crontab. If you set JAVA_OPTS globally in crontab, I would suggest moving that to individual commands (or scripts that they run) as needed, and tuning each one to its actual needs. I haven't tried to profile memory usage on commandline Java app.s yet, so I have no specific advice here. What limits have you set for Tomcat? It's easy to find poor advice on this -- I've passed along some myself -- and give Tomcat far *more* than it needs. I hope you're keeping an eye on Tomcat's actual memory usage and tuning it appropriately. (I have a weekly reminder to snoop on this with my favorite tool: Psi Probe.) > The long term plan of course is to move to a machine with more memory > (currently 4GB). 4GB should be plenty, unless you have many instances running concurrently or a truly enormous collection. Other applications, the DBMS, etc. will have some impact on that, of course. -- Mark H. Wood, Lead System Programmer mw...@iupui.edu Machines should not be friendly. Machines should be obedient.
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