On Wed, 23 Nov 2005, Michael Conlen wrote:
Sorry if this is the wrong place for this, but I haven't been getting
answers elsewhere.
I'm trying to tune the system to allow very large mmap()'s in a single
process space, something on the order of 1.5 GB so I can pass very large
values for -Xms and -Xmx to java. I know I had been able to do this on
FreeBSD in the past but recent versions of either Java or FreeBSD aren't
playing nicely. currently..
BTW, you may find it useful to use procfs to inspect the address space
layout of your process. You can d:
mkdir /proc
mount -t procfs proc /proc
cd /proc/pid
dd if=map of=/dev/stdout bs=20k
This can help you look for fragmentation of process address space, among
other things.
Robert N M Watson
I'm running
FreeBSD host 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Tue Nov 22 00:22:53 EST 2005
[EMAIL PROTECTED]:/usr/obj/usr/src/sys/WWW i386
I've also tried the following under 5.4-p1...
I try
rc = mmap(0, (891*1024*1024 + 0), 0, MAP_ANON | MAP_PRIVATE, -1, 0);
and it works but If I try
rc = mmap(0, (892*1024*1024 + 0), 0, MAP_ANON | MAP_PRIVATE, -1, 0);
it fails returning ENOMEM.
limit returns
cputime unlimited
filesize unlimited
datasize 2096128 kbytes
stacksize 1048576 kbytes
coredumpsize unlimited
memoryuse unlimited
vmemoryuse unlimited
descriptors 11095
memorylocked unlimited
maxproc 5547
sbsize unlimited
If the program isn't doing anything else but that is there any reason I'm
getting limited in the amount of memory I can mmap() at about 892 MB? Ideally
I'd like to be able to mmap most of the 2 GB available to user procs.
Oh, yes, there's plenty of free memory and swap.
Thanks
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