{"action":"created","issue":{"url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/issues/222","repository_url":"https://api.github.com/repos/RadeonOpenCompute/ROCm","labels_url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/issues/222/labels{/name}","comments_url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/issues/222/comments","events_url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/issues/222/events","html_url":"https://github.com/RadeonOpenCompute/ROCm/issues/222","id":263311720,"number":222,"title":"Suboptimal GROMACS performance on Vega","user":{"login":"pszi1ard","id":1333767,"avatar_url":"https://avatars1.githubusercontent.com/u/1333767?v=4","gravatar_id":"","url":"https://api.github.com/users/pszi1ard","html_url":"https://github.com/pszi1ard","followers_url":"https://api.github.com/users/pszi1ard/followers","following_url":"https://api.github.com/users/pszi1ard/following{/other_user}","gists_url":"https://api.github.com/users/pszi1ard/gists{/gist_id}","starred_url":"https://api.github.com/users/pszi1ard/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pszi1ard/subscriptions","organizations_url":"https://api.github.com/users/pszi1ard/orgs","repos_url":"https://api.github.com/users/pszi1ard/repos","events_url":"https://api.github.com/users/pszi1ard/events{/privacy}","received_events_url":"https://api.github.com/users/pszi1ard/received_events","type":"User","site_admin":false},"labels":[{"id":639438449,"url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/labels/Bug_Performance_issue","name":"Bug_Performance_issue","color":"d93f0b","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":20,"created_at":"2017-10-06T01:18:23Z","updated_at":"2018-05-29T12:57:57Z","closed_at":null,"author_association":"NONE","body":"The main kernel (force-only, name-pattern nbnxn_kernel_*_*_F_opencl_gfxXXX) runs up to 22% slower on Vega than on Fiji. Other kernels are a mixed bag. One of the likely contributors is that most kernels end up using quite a bit more registers when compiled for gfx900, e.g.\r\n\r\nnbnxn_kernel_ElecEw_VdwLJCombGeom_F_opencl_gfx803 registers: 81, 54\r\nnbnxn_kernel_ElecEw_VdwLJCombGeom_F_opencl_gfx900 registers: 85, 54\r\n\r\nnbnxn_kernel_ElecEw_VdwLJCombGeom_VF_opencl_gfx803  registers: 84, 68\r\nnbnxn_kernel_ElecEw_VdwLJCombGeom_VF_opencl_gfx900 registers 93, 68\r\n\r\nFor the former \"F\" kernels, performance across the relevant range of input sizes:\r\n```\r\nInput\tKernel time/iteration (ms)\r\nsize\tFiji\tVega\t\r\n0.96\t0.0727\t0.0615\t84.59%\r\n1.5\t0.1018\t0.0799\t78.49%\r\n3\t0.1165\t0.0995\t85.41%\r\n6\t0.1539\t0.169\t109.81%\r\n12\t0.2582\t0.2987\t115.69%\r\n24\t0.4327\t0.5242\t121.15%\r\n48\t0.7794\t0.9545\t122.47%\r\n96\t1.4489\t1.7762\t122.59%\r\n192\t2.7754\t3.3861\t122.00%\r\n384\t5.6074\t6.7722\t120.77%\r\n768\t11.0613\t13.5129\t122.16%\r\n1536\t21.6894\t26.646\t122.85%\r\n3072\t43.3131\t53.2424\t122.92%\r\n\r\n```\r\n"},"comment":{"url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/issues/comments/392766257","html_url":"https://github.com/RadeonOpenCompute/ROCm/issues/222#issuecomment-392766257","issue_url":"https://api.github.com/repos/RadeonOpenCompute/ROCm/issues/222","id":392766257,"user":{"login":"pszi1ard","id":1333767,"avatar_url":"https://avatars1.githubusercontent.com/u/1333767?v=4","gravatar_id":"","url":"https://api.github.com/users/pszi1ard","html_url":"https://github.com/pszi1ard","followers_url":"https://api.github.com/users/pszi1ard/followers","following_url":"https://api.github.com/users/pszi1ard/following{/other_user}","gists_url":"https://api.github.com/users/pszi1ard/gists{/gist_id}","starred_url":"https://api.github.com/users/pszi1ard/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pszi1ard/subscriptions","organizations_url":"https://api.github.com/users/pszi1ard/orgs","repos_url":"https://api.github.com/users/pszi1ard/repos","events_url":"https://api.github.com/users/pszi1ard/events{/privacy}","received_events_url":"https://api.github.com/users/pszi1ard/received_events","type":"User","site_admin":false},"created_at":"2018-05-29T12:57:57Z","updated_at":"2018-05-29T12:57:57Z","author_association":"NONE","body":"> Yes 18.20 is different compiler then in ROCm\r\nI know. As advised, will file a _new github issue_. "}}
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