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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 : 144504 Byte ( 141 KByte)
==> Memory currently allocated from system: 4253368 Byte ( 4153 KByte)
==> Maximal memory allocated from system : 4309400 Byte ( 4208 KByte)
kill p;
ReportMemoryUsage(); // less memory used: p killed
==> Memory currently used by SINGULAR : 83328 Byte ( 81 KByte)
==> Memory currently allocated from system: 4253368 Byte ( 4153 KByte)
==> Maximal memory allocated from system : 4309400 Byte ( 4208 KByte)
kill r;
ReportMemoryUsage(); // even less memory: r killed
==> Memory currently used by SINGULAR : 71088 Byte ( 69 KByte)
==> Memory currently allocated from system: 4247352 Byte ( 4147 KByte)
==> Maximal memory allocated from system : 4309400 Byte ( 4208 KByte)
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See
option;
system.
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