{"action":"created","issue":{"url":"https://api.github.com/repos/lattice/quda/issues/318","labels_url":"https://api.github.com/repos/lattice/quda/issues/318/labels{/name}","comments_url":"https://api.github.com/repos/lattice/quda/issues/318/comments","events_url":"https://api.github.com/repos/lattice/quda/issues/318/events","html_url":"https://github.com/lattice/quda/issues/318","id":95546180,"number":318,"title":"gauge fixing in ARM7+MILC ","user":{"login":"nmrcardoso","id":8808759,"avatar_url":"https://avatars.githubusercontent.com/u/8808759?v=3","gravatar_id":"","url":"https://api.github.com/users/nmrcardoso","html_url":"https://github.com/nmrcardoso","followers_url":"https://api.github.com/users/nmrcardoso/followers","following_url":"https://api.github.com/users/nmrcardoso/following{/other_user}","gists_url":"https://api.github.com/users/nmrcardoso/gists{/gist_id}","starred_url":"https://api.github.com/users/nmrcardoso/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nmrcardoso/subscriptions","organizations_url":"https://api.github.com/users/nmrcardoso/orgs","repos_url":"https://api.github.com/users/nmrcardoso/repos","events_url":"https://api.github.com/users/nmrcardoso/events{/privacy}","received_events_url":"https://api.github.com/users/nmrcardoso/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-07-16T22:38:04Z","updated_at":"2015-07-17T17:39:16Z","closed_at":null,"body":"Just for curiosity, I run a test and after a minor tweaks I has able to successfully run it.\r\nProblems running in ARM7:\r\n-> -m32 flags must be removed\r\n-> cudaHostRegister() does not work, in cuda 6.5 toolkit release notes:\r\n\"Mapping host memory allocated outside of CUDA to device memory is not\r\nallowed on ARM; because of this, cudaHostRegister() is not supported by the\r\nCUDA driver on ARM platforms. If required, cudaHostAlloc() with the flag\r\ncudaHostAllocMapped can be used to allocate device-mapped host-accessible\r\nmemory\" \r\n\r\nsome specs on a 16^4 lattice volume:\r\nwith Overrelaxation:\r\nGPU:            time_GK20A /  time_980GTX\r\nsingle           ~11.2x\r\ndouble          ~9.7x\r\nCPU:        time_ARM / time_x86_64\r\nsingle          ~4.5x\r\ndouble         ~4.9x\r\nWith FFT:\r\nGPU:            time_GK20A /  time_980GTX\r\nsingle           ~13.7x\r\ndouble          ~9.6x\r\n\r\nthe GK20A has 1 MP with 192 cores and the 980GTX has 16 MP with 128 cores/MP. \r\nWhich taking into account the total number of cores in 980GTX ~ 10x GK20A, ignoring for now the \r\ngpu and memory clocks...\r\n\r\n980GTX: using cuda 7.0\r\nGK20A: using cuda 6.5\r\n\r\nCPU ARM: ARMv7 Processor rev 3\r\nCPU x86_64: Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz"},"comment":{"url":"https://api.github.com/repos/lattice/quda/issues/comments/122350991","html_url":"https://github.com/lattice/quda/issues/318#issuecomment-122350991","issue_url":"https://api.github.com/repos/lattice/quda/issues/318","id":122350991,"user":{"login":"mathiaswagner","id":4508207,"avatar_url":"https://avatars.githubusercontent.com/u/4508207?v=3","gravatar_id":"","url":"https://api.github.com/users/mathiaswagner","html_url":"https://github.com/mathiaswagner","followers_url":"https://api.github.com/users/mathiaswagner/followers","following_url":"https://api.github.com/users/mathiaswagner/following{/other_user}","gists_url":"https://api.github.com/users/mathiaswagner/gists{/gist_id}","starred_url":"https://api.github.com/users/mathiaswagner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mathiaswagner/subscriptions","organizations_url":"https://api.github.com/users/mathiaswagner/orgs","repos_url":"https://api.github.com/users/mathiaswagner/repos","events_url":"https://api.github.com/users/mathiaswagner/events{/privacy}","received_events_url":"https://api.github.com/users/mathiaswagner/received_events","type":"User","site_admin":false},"created_at":"2015-07-17T17:39:16Z","updated_at":"2015-07-17T17:39:16Z","body":"We could check which memory allocations are allowed but I am not sure whether we need that. "}}