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OpenCL drivers from Nvidia limit their maximum memory objects to 1/4th of the device memory. This is a big restriction in adda as the major memory usage is from a single buffer (the Dmatrix). \r\nIn case of recent Nvidia consumer GPUs adda thus can only use about 1/3rd of the total device memory.\r\nAMD seems to have a default of 1/2 of the total device memory allocatable by a single buffer so that the problem is less severe on AMD cards.\r\nOne possible improvement would be #119 which would enable doubling the particle sizes by having smaller memory allocations.\r\nAnother possibility might be to keep the Dmatrix in the host memory and access it directly from the GPU as host pointer, which would probably come with a performance decrease.\r\n\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/adda-team/adda/issues/comments/419368215","html_url":"https://github.com/adda-team/adda/issues/229#issuecomment-419368215","issue_url":"https://api.github.com/repos/adda-team/adda/issues/229","id":419368215,"node_id":"MDEyOklzc3VlQ29tbWVudDQxOTM2ODIxNQ==","user":{"login":"vondele","id":4202567,"node_id":"MDQ6VXNlcjQyMDI1Njc=","avatar_url":"https://avatars3.githubusercontent.com/u/4202567?v=4","gravatar_id":"","url":"https://api.github.com/users/vondele","html_url":"https://github.com/vondele","followers_url":"https://api.github.com/users/vondele/followers","following_url":"https://api.github.com/users/vondele/following{/other_user}","gists_url":"https://api.github.com/users/vondele/gists{/gist_id}","starred_url":"https://api.github.com/users/vondele/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vondele/subscriptions","organizations_url":"https://api.github.com/users/vondele/orgs","repos_url":"https://api.github.com/users/vondele/repos","events_url":"https://api.github.com/users/vondele/events{/privacy}","received_events_url":"https://api.github.com/users/vondele/received_events","type":"User","site_admin":false},"created_at":"2018-09-07T08:43:39Z","updated_at":"2018-09-07T08:43:39Z","author_association":"NONE","body":"OK, I see. Thanks."}}
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