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3.11 memory

Syntax:
memory ( int_expression )
Type:
int
Purpose:
returns statistics concerning the memory management:
  • memory(0) is the number of active (used) bytes,
  • memory(1) is the number of bytes allocated from the operating system,
  • memory(2) is the maximal number of bytes ever allocated from the operating system during the current PLURAL session.
Note:
To monitor the memory usage during ongoing computations the option mem should be set (using the command option(mem); .
Example:
 
ring r=0,(x(1..100)),dp;
ncalgebra(-1,0);
poly p=(x(1)+x(100))^50;
proc ReportMemoryUsage()
{  "Memory currently used by SINGULAR     :",memory(0),"Byte (",
   memory(0)/101023, "KByte)" +newline+
   "Memory currently allocated from system:",memory(1), "Byte (",
   memory(1)/1023, "KByte)";
   "Maximal memory allocated from system  :",memory(2), "Byte (",
   memory(2)/1023, "KByte)";
}
ReportMemoryUsage();
==> Memory currently used by SINGULAR     : 3976388 Byte ( 39 KByte)
==> Memory currently allocated from system: 4499188 Byte ( 4398 KByte)
==> Maximal memory allocated from system  : 4499188 Byte ( 4398 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR     : 3970528 Byte ( 39 KByte)
==> Memory currently allocated from system: 4499188 Byte ( 4398 KByte)
==> Maximal memory allocated from system  : 4499188 Byte ( 4398 KByte)
kill r; 
See also: option.


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            User manual for Singular version 2-1-99, August 2004, generated by texi2html.