|
5.1.87 memory
Syntax:
memory ( int_expression )
Type:
- bigint
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 SINGULAR session.
Note:
- To monitor the memory usage during ongoing computations the option
mem should be set (using the command option(mem); , see
also option).
Example:
| ring r=0,(x(1..500)),dp;
poly p=(x(1)+x(500))^50;
proc ReportMemoryUsage()
{ "Memory currently used by SINGULAR :",memory(0),"Byte (",
int(memory(0) div 1024), "KByte)" +newline+
"Memory currently allocated from system:",memory(1), "Byte (",
int(memory(1) div 1024), "KByte)";
"Maximal memory allocated from system :",memory(2), "Byte (",
int(memory(2) div 1024), "KByte)";
}
ReportMemoryUsage();
==> Memory currently used by SINGULAR : 153408 Byte ( 149 KByte)
==> Memory currently allocated from system: 2228224 Byte ( 2176 KByte)
==> Maximal memory allocated from system : 2232320 Byte ( 2180 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 82848 Byte ( 81 KByte)
==> Memory currently allocated from system: 2228224 Byte ( 2176 KByte)
==> Maximal memory allocated from system : 2232320 Byte ( 2180 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 70648 Byte ( 69 KByte)
==> Memory currently allocated from system: 2228224 Byte ( 2176 KByte)
==> Maximal memory allocated from system : 2232320 Byte ( 2180 KByte)
|
See
option;
system.
|