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 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 : 127664 Byte ( 124 KByte) ==> Memory currently allocated from system: 2220032 Byte ( 2168 KByte) ==> Maximal memory allocated from system : 2256896 Byte ( 2204 KByte) kill p; ReportMemoryUsage(); // less memory used: p killed ==> Memory currently used by SINGULAR : 74424 Byte ( 72 KByte) ==> Memory currently allocated from system: 2220032 Byte ( 2168 KByte) ==> Maximal memory allocated from system : 2256896 Byte ( 2204 KByte) kill r; ReportMemoryUsage(); // even less memory: r killed ==> Memory currently used by SINGULAR : 64024 Byte ( 62 KByte) ==> Memory currently allocated from system: 2215936 Byte ( 2164 KByte) ==> Maximal memory allocated from system : 2256896 Byte ( 2204 KByte)