{"action":"created","issue":{"url":"https://api.github.com/repos/JPaulMora/Pyrit/issues/451","labels_url":"https://api.github.com/repos/JPaulMora/Pyrit/issues/451/labels{/name}","comments_url":"https://api.github.com/repos/JPaulMora/Pyrit/issues/451/comments","events_url":"https://api.github.com/repos/JPaulMora/Pyrit/issues/451/events","html_url":"https://github.com/JPaulMora/Pyrit/issues/451","id":108036778,"number":451,"title":"Performance gains drops off drastically when adding 4th and 5th AWS GPU cluster","user":{"login":"GoogleCodeExporter","id":9614759,"avatar_url":"https://avatars.githubusercontent.com/u/9614759?v=3","gravatar_id":"","url":"https://api.github.com/users/GoogleCodeExporter","html_url":"https://github.com/GoogleCodeExporter","followers_url":"https://api.github.com/users/GoogleCodeExporter/followers","following_url":"https://api.github.com/users/GoogleCodeExporter/following{/other_user}","gists_url":"https://api.github.com/users/GoogleCodeExporter/gists{/gist_id}","starred_url":"https://api.github.com/users/GoogleCodeExporter/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/GoogleCodeExporter/subscriptions","organizations_url":"https://api.github.com/users/GoogleCodeExporter/orgs","repos_url":"https://api.github.com/users/GoogleCodeExporter/repos","events_url":"https://api.github.com/users/GoogleCodeExporter/events{/privacy}","received_events_url":"https://api.github.com/users/GoogleCodeExporter/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/JPaulMora/Pyrit/labels/auto-migrated","name":"auto-migrated","color":"ededed"},{"url":"https://api.github.com/repos/JPaulMora/Pyrit/labels/Priority-Medium","name":"Priority-Medium","color":"ededed"},{"url":"https://api.github.com/repos/JPaulMora/Pyrit/labels/Type-Defect","name":"Type-Defect","color":"ededed"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2015-09-24T01:06:32Z","updated_at":"2015-10-02T15:02:33Z","closed_at":"2015-10-02T15:02:33Z","body":"```\nWhat steps will reproduce the problem?\n1. pyrit benchmark on AWS GPU cluster with 1 node, then 2, then 3, 4, and 5\n2. record the benchmarked PMKs after adding each node\n3.\n\nWhat is the expected output? What do you see instead?\nI expect the gain in performance to be somewhat liner. 20k PMKs/s, 40k, 60k , \n80k, 100k, etc.  I do see this linear gain when adding node 2 and 3, but I \ndon't see hardly any gain at all with the 4th node, and the 5th node actually \nactually drops the PMKs/s to about 50% of the performance of 3 nodes.\n\nWhat version of the product are you using? On what operating system?\n\nPyrit 0.4.1-dev (svn r308)\nG2 Instances are backed by 1 x NVIDIA GRID GPU (Kepler GK104) and 8 x hardware \nhyperthreads from an Intel Xeon E5-2670\n\n\nPlease provide any additional information below.\n```\n\nOriginal issue reported on code.google.com by `phillip....@gmail.com` on 6 Jun 2014 at 2:54"},"comment":{"url":"https://api.github.com/repos/JPaulMora/Pyrit/issues/comments/145052444","html_url":"https://github.com/JPaulMora/Pyrit/issues/451#issuecomment-145052444","issue_url":"https://api.github.com/repos/JPaulMora/Pyrit/issues/451","id":145052444,"user":{"login":"JPaulMora","id":8335656,"avatar_url":"https://avatars.githubusercontent.com/u/8335656?v=3","gravatar_id":"","url":"https://api.github.com/users/JPaulMora","html_url":"https://github.com/JPaulMora","followers_url":"https://api.github.com/users/JPaulMora/followers","following_url":"https://api.github.com/users/JPaulMora/following{/other_user}","gists_url":"https://api.github.com/users/JPaulMora/gists{/gist_id}","starred_url":"https://api.github.com/users/JPaulMora/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JPaulMora/subscriptions","organizations_url":"https://api.github.com/users/JPaulMora/orgs","repos_url":"https://api.github.com/users/JPaulMora/repos","events_url":"https://api.github.com/users/JPaulMora/events{/privacy}","received_events_url":"https://api.github.com/users/JPaulMora/received_events","type":"User","site_admin":false},"created_at":"2015-10-02T15:02:33Z","updated_at":"2015-10-02T15:02:33Z","body":"Please try the newest version, as it lets you totally disable CPU. This will make the CPUs only responsible of 'feeding ' the GPUs work and not compute it. "}}