1

This is the output of my top command.

Tasks: 633 total,   1 running, 380 sleeping,   0 stopped,   0 zombie
%Cpu(s):  9.9 us,  1.1 sy,  0.0 ni, 65.1 id, 23.9 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 26407128+total,  1078396 free, 31198216 used, 23179465+buff/cache
KiB Swap: 26419200+total, 26342462+free,   767368 used. 23102633+avail Mem 

What are the plus signs in memory representations - does it mean the system cannot estimate the whole available memory or the number is too long to write here? How do I show the whole memory?

2

The + means the number was too long to fit here. You can see different representations of the number with the E command.

From the top(1) manpage:

E : Extend-Memory-Scale in Summary Area

With this command you can cycle through the available summary area memory scaling which ranges from KiB (kibibytes or 1,024 bytes) through EiB (exbibytes or 1,152,921,504,606,846,976 bytes).

If you see a '+' between a displayed number and the following label, it means that top was forced to truncate some portion of that number. By raising the scaling factor, such truncation can be avoided.

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