Java VM + Huge Pages

JustMZT

JustMZT

Hi to all! Just a few days ago have set up FreeBSD for Minecraft server. In the past i used to use Arch Linux and Debian. On FreeBSD, I have several problems:
  1. How to set up huge pages for VM? In Arch Linux, it was /etc/sysctl.conf. Using Google didn't help me with this problem :P

    Need HugePages as without them server lags, like Crysis 2 on GTX 6600 :)
  2. Another problem is VM. How to set up, configure, optimize it for FreeBSD?
    (Now it is so "Could not create the Java virtual machine.")

    And I would be glad to hear some interesting things which will help to optimize and make Java works faster :)

I really have spend 2 days for google to find some info about that. May be problem was in that i don't know English very well :)

RAM: 24 GB
CPU: i7 920 4.2 GHz
DISK: SSD 64 GB

Thx!
 
JustMZT said:
Hi to all! Just a few days ago have set up FreeBSD for Minecraft server. In the past i used to use Arch Linux and Debian. On FreeBSD, I have several problems:
  1. How to set up huge pages for VM? In Arch Linux, it was /etc/sysctl.conf. Using Google didn't help me with this problem :P
Click to expand...


  1. Short reply: you can't.
    FreeBSD (since 7.X) has a transparent support of huge pages (called superpages). If I understand well, that merges automagically small pages into super pages. But there is no way for an application (such java) to request some superpages (may be in 10-current?).

    See: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/hackers/2011-10/msg00123.html

    For the rest I don't know, check the java documentation (performance tuning).

    Regards.
 
plamaiziere said:
Short reply: you can't.
FreeBSD (since 7.X) has a transparent support of huge pages (called superpages). If I understand well, that merges automagically small pages into super pages. But there is no way for an application (such java) to request some superpages (may be in 10-current?).

See: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/hackers/2011-10/msg00123.html

For the rest I don't know, check the java documentation (performance tuning).

Regards.
Click to expand...
I have special -VM option and when there are no huge pages i will get error, will see this

But what about JVM? How to make it work
 
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