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+<HTML>
+<HEAD>
+<TITLE>chmem(1)</TITLE>
+</HEAD>
+<BODY>
+<H1>chmem(1)</H1>
+<HR>
+<PRE>
+
+</PRE>
+<H2>NAME</H2><PRE>
+     chmem - change memory allocation
+
+
+</PRE>
+<H2>SYNOPSIS</H2><PRE>
+     <STRONG>chmem</STRONG> [<STRONG>+</STRONG>] [<STRONG>-</STRONG>] [<STRONG>=</STRONG>] <EM>amount</EM> <EM>file</EM>
+
+
+</PRE>
+<H2>EXAMPLES</H2><PRE>
+
+     <STRONG>chmem</STRONG> <STRONG>=50000</STRONG> <STRONG>a.out</STRONG>  # Give <EM>a</EM>.<EM>out</EM> 50K of stack space
+
+     <STRONG>chmem</STRONG> <STRONG>-4000</STRONG> <STRONG>a.out</STRONG>   # Reduce the stack space by 4000 bytes
+
+     <STRONG>chmem</STRONG> <STRONG>+1000</STRONG> <STRONG>file1</STRONG>   # Increase each stack by 1000 bytes
+
+
+</PRE>
+<H2>DESCRIPTION</H2><PRE>
+
+     When a program is loaded into memory, it is allocated enough  memory  for
+     the text and data+bss segments, plus an area for the stack.  Data segment
+     growth using <EM>malloc</EM> , <EM>brk</EM> , or <EM>sbrk</EM> eats up stack space from the low end.
+     The  amount  of  stack  space  to allocate is derived from a field in the
+     executable program's file header.  If the combined stack and data segment
+     growth exceeds the stack space allocated, the program will be terminated.
+
+     It is therefore important to set the amount of stack space carefully.  If
+     too  little is provided, the program may crash.  If too much is provided,
+     memory will be wasted, and fewer programs will be able to fit  in  memory
+     and  run  simultaneously.   MINIX  does  not swap, so that when memory is
+     full, subsequent attempts to fork will fail.  The compiler sets the stack
+     space  to  the  largest  possible value (for the Intel CPUs, 64K - text -
+     data).  For many programs, this value is  far  too  large.   Nonrecursive
+     programs  that  do  not call <EM>brk</EM> , <EM>sbrk</EM> , or <EM>malloc</EM> , and do not have any
+     local arrays usually do not need more than 8K of stack space.
+
+     The <EM>chmem</EM> command changes the value of the header field  that  determines
+     the  stack  allocation,  and thus indirectly the total memory required to
+     run the program.  The = option sets the stack size to a  specific  value;
+     the  +  and  -  options  increment and decrement the current value by the
+     indicated amount.  The old and new stack sizes are printed.
+
+
+</PRE>
+<H2>SEE ALSO</H2><PRE>
+     <STRONG><A HREF="../man1/install.1.html">install(1)</A></STRONG>, <STRONG><A HREF="../man2/brk.2.html">brk(2)</A></STRONG>.
+
+
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+
+
+</PRE>
+</BODY>
+</HTML>