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5.1.89 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 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 : 153472 Byte ( 149 KByte)
==> Memory currently allocated from system: 2157232 Byte ( 2106 KByte)
==> Maximal memory allocated from system : 2213264 Byte ( 2161 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 82904 Byte ( 77 KByte)
==> Memory currently allocated from system: 2157232 Byte ( 2106 KByte)
==> Maximal memory allocated from system : 2213264 Byte ( 2161 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 70664 Byte ( 69 KByte)
==> Memory currently allocated from system: 2150200 Byte ( 2099 KByte)
==> Maximal memory allocated from system : 2213264 Byte ( 2161 KByte)
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See
option;
system.
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