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5.1.80 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 : 225076 Byte ( 220 KByte)
==> Memory currently allocated from system: 670280 Byte ( 655 KByte)
==> Maximal memory allocated from system : 702088 Byte ( 686 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 171836 Byte ( 168 KByte)
==> Memory currently allocated from system: 670280 Byte ( 655 KByte)
==> Maximal memory allocated from system : 702088 Byte ( 686 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 161188 Byte ( 157 KByte)
==> Memory currently allocated from system: 666268 Byte ( 651 KByte)
==> Maximal memory allocated from system : 702088 Byte ( 686 KByte)
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See
option;
system.
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