On 04/23/2012 05:27 AM, Richard Davies wrote:
The rrd graphs at http://imgur.com/a/Fklxr show a typical incident. We estimate memory used from /proc/meminfo as: = MemTotal - MemFree - Buffers + SwapTotal - SwapFree The first rrd shows memory used increasing as a VM starts, but not getting near the 64GB of physical RAM. The second rrd shows the heavy swapping this VM start caused. The third rrd shows a multi-gigabyte jump in swap used = SwapTotal - SwapFree The fourth rrd shows the large load spike (from 1 to 15) caused by this swap storm.
These are exactly the kind of swap storms that led me make the VM tweaks that got merged into 3.4-rc :) See these commits: fe2c2a106663130a5ab45cb0e3414b52df2fff0c 7be62de99adcab4449d416977b4274985c5fe023 aff622495c9a0b56148192e53bdec539f5e147f2 1480de0340a8d5f094b74d7c4b902456c9a06903 496b919b3bdd957d4b1727df79bfa3751bced1c1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>