Background

In last post, we discussed how to enable PAE functionality on a FreeBSD machine. But some people may also concern the memory usage limitation of single process.

By default, every process can only allocate 512 MB memory for data size, which is defined as MAXDSIZ in kernel configuration file. To break the barrier, simply set a variable in /boot/loader.conf

kern.maxdsiz="2048M"


or adjust the value of MAXDSIZ in kernel configuration file for static setting:

options MAXDSIZ=(2048UL*1024*1024)


But if you set the value too high without further consideration, it might be the beginning of disaster…
閱讀全文 Troubleshooting for PAE under FreeBSD →

Recently, I’m conducting experimental simulations for my thesis, using NS-2.
It’s about mobile ad hoc networks (MANET).

In some scenario, the number of nodes in a network grows, the demand of memory also increases tremendously. Since NS-2 is a memory hungry network simulator, it’s a good idea to add more RAM for better performance.

Now, I’m putting four sticks of DDR2 1G memory module on the motherboard of my server, all memory slots are full!!

閱讀全文 PAE Configuration for FreeBSD →