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 : 153976 Byte ( 150 KByte) ==> Memory currently allocated from system: 2157280 Byte ( 2106 KByte) ==> Maximal memory allocated from system : 2213312 Byte ( 2161 KByte) kill p; ReportMemoryUsage(); // less memory used: p killed ==> Memory currently used by SINGULAR : 83416 Byte ( 81 KByte) ==> Memory currently allocated from system: 2157280 Byte ( 2106 KByte) ==> Maximal memory allocated from system : 2213312 Byte ( 2161 KByte) kill r; ReportMemoryUsage(); // even less memory: r killed ==> Memory currently used by SINGULAR : 71184 Byte ( 69 KByte) ==> Memory currently allocated from system: 2150248 Byte ( 2099 KByte) ==> Maximal memory allocated from system : 2213312 Byte ( 2161 KByte)