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out of memory?

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http://www.unix.com – I had a situation where the server was basically unresponsive and apparently it was out of memory. I ran top and free commands and got the following outputs. I figured it was out of memory because there was no free swap left. But quite frankly I'm perplexed by this output, why does it appear that there's 18845 MB of free memory? I must be missing something. Code: # top top - 10:40:03 up 13 days, 14 min, 21 users,  load average: 6.95, 9.27, 49.59 Tasks: 20984 total,  5 running, 20979 sleeping,  0 stopped,  0 zombie Cpu(s): 10.3%us, 15.5%sy,  0.0%ni, 53. (HowTos)