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5.1.75 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)/1023), "KByte)" +newline+
"Memory currently allocated from system:",memory(1), "Byte (",
int(memory(1)/1023), "KByte)";
"Maximal memory allocated from system :",memory(2), "Byte (",
int(memory(2)/1023), "KByte)";
}
ReportMemoryUsage();
==> Memory currently used by SINGULAR : 212048 Byte ( 207 KByte)
==> Memory currently allocated from system: 689124 Byte ( 673 KByte)
==> Maximal memory allocated from system : 689124 Byte ( 673 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 158808 Byte ( 155 KByte)
==> Memory currently allocated from system: 689124 Byte ( 673 KByte)
==> Maximal memory allocated from system : 689124 Byte ( 673 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 148172 Byte ( 144 KByte)
==> Memory currently allocated from system: 689124 Byte ( 673 KByte)
==> Maximal memory allocated from system : 689124 Byte ( 673 KByte)
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See
option;
system.
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