Chris, > On 2/8/2011 3:16 PM, Robinson, Eric wrote: > > This is great feedback, Chuck. Right now we have 200+ instances > > running on the same server, most of which are set to 64MB > min and max > > heap. Like I daid, we do not see OOM messages or paging, > and top shows > > about 27GB of 32GB in use. Based on your comments, I would > expect that > > changing the instances to 32M min and 512M max would not cause a > > negative impact. I will give this a try and report the effect. > > Here's the problem, though: if you leave your system as it > is, and one (or more) of your VM/webapps suffers an OOME, > only that one VM/webapp suffers. If you increase the -Xmx for > /all/ instances, then in cases where memory usage spikes, an > individual instance could potentially negatively impact all > other instances because of memory thrashing. > > - -chris
Obviously I need to understand this better. If all instances are set to -Xmx512M and then one instance peaks to 512M and even tries to go above that (and therefore generates an OOME) how does that impact the other instances? Does an OOME mean there is no more memory available from the OS? I thought it just meant it had used the max memory allowed by the -Xmx setting. That should not cause a problem for other instances should it? --Eric Disclaimer - February 8, 2011 This email and any files transmitted with it are confidential and intended solely for Tomcat Users List. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physicians' Managed Care or Physician Select Management. Warning: Although Physicians' Managed Care or Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments. This disclaimer was added by Policy Patrol: http://www.policypatrol.com/ --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
