Date: Fri, 14 May 2004 04:48:31 -0400 From: "Joseph Gleason" <dot@fireduck.com> To: <freebsd-questions@freebsd.org> Subject: 64mb stack size limit? Message-ID: <000e01c43990$3bf36fe0$08695f0a@frigate>
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[-- Attachment #1 --]
Short question:
Is there a way to increase the stack size limit for a user
process beyond 64mb?
Background:
FreeBSD in question is 5.2.1-RELEASE.
I am running an application (unison from
/usr/ports/net/unison). This program by virtue to how it
was developed (or possibly the language is uses, that being
ocaml) uses a large amount of stack space when syncing large
directory structures.
With directory structures that contain on the order of
30,000 files, unison runs out of stack.
Using the bash shell:
ulimit reports a stack limit of 65536k:
# ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) 524288
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 11095
pipe size (512 bytes, -p) 1
stack size (kbytes, -s) 65536
cpu time (seconds, -t) unlimited
max user processes (-u) 5547
virtual memory (kbytes, -v) unlimited
Doing ulimit -s with a higher value does not seem to produce
an error or change to this value.
A little C++ program that I wrote to test stack limits
confirms the 64mb limit, regardless of what I tell ulimit.
Source is attached.
[-- Attachment #2 --]
#include <iostream>
using namespace std;
void r(int l)
{
unsigned char B[1048576];
for(int i=0; i<1048576; i++) B[i]=i%256;
cout << l+1 << "MB on stack." << endl;
r(l+1);
}
int main()
{
r(0);
}
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