Here is what I have written as a possible contribution for the Users
Guide concerning
adjusting the Cygwin memory limit:
Cygwin comes with a maximum program size (program+data) of 384 MB. This
means that by default no program can allocate more than this. To run
using more real or virtual memory in your machine you must add a entry
in the Cygwin HKEY_CURRENT_USER section of the registry. Add the DWORD
value heap_chunk_in_mb and set it to desired memory limit in decimal
MB using the regtool program included in the Cygwin cygutils package.
In this example the limit is set to 1024 MB:
regtool -i set /HKCU/Software/Cygnus\ Solutions/Cygwin/heap_chunk_in_mb 1024
regtool -v list /HKCU/Software/Cygnus\ Solutions/Cygwin
Exit all running Cygwin processes and restart them. Memory can be
allocated up to the size of the system swap space minus any the size of
any running processes. The system swap should be at least as large as
the physically installed RAM and can be modified under the System
category in the Control Panel accessible through the Settings tag of the
Win32 Start menu.
A program written by DJ Delorie tests the memory allocation limit on
your system:
main()
{
unsigned int bit=0x40000000, sum=0;
char *x;
while (bit > 4096) {
x = malloc(bit);
if (x)
sum += bit;
bit >>= 1;
}
printf("%08x bytes (%.1fMb)\n", sum, sum/1024.0/1024.0);
return 0;
}
compile using
gcc max_memory.c -o max_memory
Run the program and you will see the maximum memory that can be allocated.
--
Dr. Charles L. Werner
Gamma Remote Sensing AG
Thunstrasse 130
CH-3074 Muri b. Bern, Switzerland
Tel: +41 31 951 70 05
FAX: +41 31 951 70 08
http://www.gamma-rs.ch
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Bug reporting: http://cygwin.com/bugs.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/
