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ATOP shows red line vmcom and vmlim. What does it mean?

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http://unix.stackexchange.com – utility atop shows: ATOP - MyServer 2013/01/07 00:03:57 10 seconds elapsed PRC | sys 2.18s | user 8.33s | #proc 141 | #zombie 0 | #exit 0 | CPU | sys 21% | user 139% | irq 0% | idle 228% | wait 11% | cpu | sys 5% | user 40% | irq 0% | idle 51% | cpu002 w 3% | cpu | sys 5% | user 35% | irq 0% | idle 56% | cpu001 w 3% | cpu | sys 7% | user 30% | irq 0% | idle 61% | cpu000 w 2% | cpu | sys 4% | user 34% | irq 0% | idle 61% | cpu003 w 1% | CPL | avg1 1.00 | a (HowTos)