I used to run 4 VMs on my dual core machine but actually was running nothing seriousely. A while back I read an article from Ubuntu about its cloud setup, mentioning you should not run VMs more than number of cores you have, I was laughing at the article at that time, since it sounds ridiclous – as long as CPU can handle the load, we should run as many VMs as possible and – the bottleneck seems coming freom memory to me.<\/p>\n
Obviously I was wrong. Once I started testing Casasandra, I got lots of timeouts from 4 VMs, I checked memory, there was no problem at all, i.e. every VM’s memory is in physical memory. I was also doubt Ubuntu is not doing as good as Fedore, obviously Iwas wrong either, then I recalled the article, shut down 2 VMs and … you know, things work like a chime.<\/p>\n
There could be saomew thesis telling why CPU is the bottleneck, but I don’t have time to dig it out, the most important lesson I took from this case is, don’t take anythingn in granted, respect preofessional advices<\/p>\n","protected":false},"excerpt":{"rendered":"
I used to run 4 VMs on my dual core machine but actually was running nothing seriousely. A while back I read an article from Ubuntu about its cloud setup, mentioning you should not run VMs more than number of cores you have, I was laughing at the article at that time, since it sounds […]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[13,134],"_links":{"self":[{"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/posts\/755"}],"collection":[{"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/comments?post=755"}],"version-history":[{"count":3,"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/posts\/755\/revisions"}],"predecessor-version":[{"id":757,"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/posts\/755\/revisions\/757"}],"wp:attachment":[{"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/media?parent=755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/categories?post=755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xiehang.com\/blog\/wp-json\/wp\/v2\/tags?post=755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}