Date: Wed, 23 Nov 2005 10:48:10 -0500 From: Michael Conlen <m@obmail.net> To: freebsd-performance@freebsd.org Subject: mmap() Message-ID: <6C48A943-1AB3-4DF4-B8CC-CD75B9F36E98@obmail.net>
next in thread | raw e-mail | index | archive | help
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..
I'm running
FreeBSD host 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Tue Nov 22 00:22:53
EST 2005 root@host:/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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?6C48A943-1AB3-4DF4-B8CC-CD75B9F36E98>