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5.1.81 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 : 233424 Byte ( 228 KByte)
==> Memory currently allocated from system: 2243268 Byte ( 2192 KByte)
==> Maximal memory allocated from system : 2275076 Byte ( 2223 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 180184 Byte ( 176 KByte)
==> Memory currently allocated from system: 2243268 Byte ( 2192 KByte)
==> Maximal memory allocated from system : 2275076 Byte ( 2223 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 169536 Byte ( 165 KByte)
==> Memory currently allocated from system: 2239256 Byte ( 2188 KByte)
==> Maximal memory allocated from system : 2275076 Byte ( 2223 KByte)
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See
option;
system.
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