nio based servlet containers should reduce the number of threads required though... but yeah i forgot about that competing limit
- Stephen --- Sent from my Android phone, so random spelling mistakes, random nonsense words and other nonsense are a direct result of using swype to type on the screen On 19 Dec 2011 20:36, "Mark Struberg" <strub...@yahoo.de> wrote: > and please don't give more than 1,6 GB if using a 32 bit JVM! > The more ram you give, the less threads you can spawn on 32 bit JVMs! > This was so bad, that we couldn't even get 100 parallel threads when going > near 1.8GB ;) > > I hope not many people need to deal with this stuff nowadays anymore > though :) > > LieGrue, > strub > > > > ----- Original Message ----- > > From: Stephen Connolly <stephen.alan.conno...@gmail.com> > > To: MyFaces Discussion <users@myfaces.apache.org> > > Cc: > > Sent: Monday, December 19, 2011 9:11 PM > > Subject: Re: JVM optimized memory setting for server > > > > if the server us dedicated and has 8gb of ram... you could give 6gb (or > 3g > > if a 32bit os as more will nor be used on 32bit os)... BUT when the stop > > the world big Garbage Collection triggers (and it will trigger eventually > > as the last resort to resolve heap fragmentation) then that gc will be 6 > > times longer... if your app response time is important then giving more > > memory could cause more of a problem. > > > > - Stephen > > > > --- > > Sent from my Android phone, so random spelling mistakes, random nonsense > > words and other nonsense are a direct result of using swype to type on > the > > screen > > On 19 Dec 2011 20:01, "Jim May" <jim.webg...@gmail.com> wrote: > > > >> I have been doing some research on this topic and I know that there is > >> quite a bit of information out there. Unfortunately, I usually do not > >> notice articles that recommend JVM tuning setting for servers with X > amount > >> of memory. I have an issue with a production tomcat server that is > running > >> two applications. One of the applications has an export all records > feature > >> AS AN OPTION. The default is export only the 100 rows on the page, but > >> sometimes the Admin needs to go to the site and export all records into > >> excel for their reporting. Now the admin is triggering the export all > >> feature and the server is imploding with out of memory errors for the > heap. > >> > >> This is the current settings: > >> > >> -Xms256m -Xmx1024m -XX:MaxPermSize=384m -XX:PermSize=256m > >> > >> I was wondering what you would recommend for JVM tuning settings on a > >> server that has 8GB or higher of memory? Are there rules that are > usually > >> followed in deciding the settings? The server is completely dedicated > to > >> the two websites and the database runs on a different server. > >> > >> Thanks, > >> -- > >> James > >> > > >
