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5.1.82 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 : 224484 Byte ( 219 KByte)
==> Memory currently allocated from system: 2243328 Byte ( 2190 KByte)
==> Maximal memory allocated from system : 2269112 Byte ( 2215 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 171244 Byte ( 167 KByte)
==> Memory currently allocated from system: 2243328 Byte ( 2190 KByte)
==> Maximal memory allocated from system : 2269112 Byte ( 2215 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 160856 Byte ( 157 KByte)
==> Memory currently allocated from system: 2239316 Byte ( 2186 KByte)
==> Maximal memory allocated from system : 2269112 Byte ( 2215 KByte)
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See
option;
system.
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