5.1.71 memory

Syntax:

memory ( int_expression )

Type:

int

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 (", memory(0)/1023, "KByte)" +newline+ "Memory currently allocated from system:",memory(1), "Byte (", memory(1)/1023, "KByte)"; "Maximal memory allocated from system :",memory(2), "Byte (", memory(2)/1023, "KByte)"; } ReportMemoryUsage(); → Memory currently used by SINGULAR : 206940 Byte ( 202 KByte) → Memory currently allocated from system: 669128 Byte ( 654 KByte) → Maximal memory allocated from system : 669128 Byte ( 654 KByte) kill p; ReportMemoryUsage(); // less memory used: p killed → Memory currently used by SINGULAR : 153704 Byte ( 150 KByte) → Memory currently allocated from system: 669128 Byte ( 654 KByte) → Maximal memory allocated from system : 669128 Byte ( 654 KByte) kill r; ReportMemoryUsage(); // even less memory: r killed → Memory currently used by SINGULAR : 143124 Byte ( 139 KByte) → Memory currently allocated from system: 669128 Byte ( 654 KByte) → Maximal memory allocated from system : 669128 Byte ( 654 KByte)

See option; system.