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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 : 225660 Byte ( 220 KByte)
==> Memory currently allocated from system: 1335296 Byte ( 1305 KByte)
==> Maximal memory allocated from system : 1335296 Byte ( 1305 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 172420 Byte ( 168 KByte)
==> Memory currently allocated from system: 1335296 Byte ( 1305 KByte)
==> Maximal memory allocated from system : 1335296 Byte ( 1305 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 161772 Byte ( 158 KByte)
==> Memory currently allocated from system: 1335296 Byte ( 1305 KByte)
==> Maximal memory allocated from system : 1335296 Byte ( 1305 KByte)
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See
option;
system.
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