{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/52113370","id":52113370,"diff_hunk":"@@ -87,18 +92,39 @@ object HashBenchmark {\n       .add(\"binary\", BinaryType)\n       .add(\"date\", DateType)\n       .add(\"timestamp\", TimestampType)\n-    test(\"normal\", normal, 128)\n+    /*\n+    Intel(R) Core(TM) i7-4960HQ CPU @ 2.60GHz\n+    Hash For normal:                    Best/Avg Time(ms)    Rate(M/s)   Per Row(ns)   Relative\n+    -------------------------------------------------------------------------------------------\n+    interpreted version                      2209 / 2271          0.9        1053.4       1.0X\n+    codegen version                          1887 / 2018          1.1         899.9       1.2X","path":"sql/catalyst/src/test/scala/org/apache/spark/sql/HashBenchmark.scala","position":37,"original_position":37,"commit_id":"315af8cdb87a8033e86f2c6c318b615f79bfc3da","original_commit_id":"315af8cdb87a8033e86f2c6c318b615f79bfc3da","user":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"body":"Sorry, I read it wrong.","created_at":"2016-02-07T07:09:43Z","updated_at":"2016-02-07T07:09:43Z","html_url":"https://github.com/apache/spark/pull/10917#discussion_r52113370","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/10917","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/52113370"},"html":{"href":"https://github.com/apache/spark/pull/10917#discussion_r52113370"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/10917"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/10917","id":57172361,"html_url":"https://github.com/apache/spark/pull/10917","diff_url":"https://github.com/apache/spark/pull/10917.diff","patch_url":"https://github.com/apache/spark/pull/10917.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/10917","number":10917,"state":"open","locked":false,"title":"[SPARK-12888][SQL][follow-up] benchmark the new hash expression","user":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars.githubusercontent.com/u/3182036?v=3","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"body":"Adds the benchmark results as comments.\r\n\r\nThe codegen version is slower than the interpreted version for `simple` case becasue of 3 reasons:\r\n\r\n1. codegen version use a more complex hash algorithm than interpreted version, i.e. `Murmur3_x86_32.hashInt` vs [simple multiplication and addition](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/rows.scala#L153).\r\n2. codegen version will write the hash value to a row first and then read it out. I tried to create a `GenerateHasher` that can generate code to return hash value directly and got about 60% speed up for the `simple` case, does it worth?\r\n3. the row in `simple` case only has one int field, so the runtime reflection may be removed because of branch prediction, which makes the interpreted version faster.\r\n\r\nThe `array` case is also slow for similar reasons, e.g. array elements are of same type, so interpreted version can probably get rid of runtime reflection by branch prediction.","created_at":"2016-01-26T05:48:16Z","updated_at":"2016-02-07T07:09:43Z","closed_at":null,"merged_at":null,"merge_commit_sha":"45d76e41491979faeedc060de75021edbf59c545","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/10917/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/10917/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/10917/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/315af8cdb87a8033e86f2c6c318b615f79bfc3da","head":{"label":"cloud-fan:hash-benchmark","ref":"hash-benchmark","sha":"315af8cdb87a8033e86f2c6c318b615f79bfc3da","user":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars.githubusercontent.com/u/3182036?v=3","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"repo":{"id":19689699,"name":"spark","full_name":"cloud-fan/spark","owner":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars.githubusercontent.com/u/3182036?v=3","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/cloud-fan/spark","description":"Mirror of Apache Spark","fork":true,"url":"https://api.github.com/repos/cloud-fan/spark","forks_url":"https://api.github.com/repos/cloud-fan/spark/forks","keys_url":"https://api.github.com/repos/cloud-fan/spark/keys{/key_id}","collaborators_url":"https://api.github.com/repos/cloud-fan/spark/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/cloud-fan/spark/teams","hooks_url":"https://api.github.com/repos/cloud-fan/spark/hooks","issue_events_url":"https://api.github.com/repos/cloud-fan/spark/issues/events{/number}","events_url":"https://api.github.com/repos/cloud-fan/spark/events","assignees_url":"https://api.github.com/repos/cloud-fan/spark/assignees{/user}","branches_url":"https://api.github.com/repos/cloud-fan/spark/branches{/branch}","tags_url":"https://api.github.com/repos/cloud-fan/spark/tags","blobs_url":"https://api.github.com/repos/cloud-fan/spark/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/cloud-fan/spark/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/cloud-fan/spark/git/refs{/sha}","trees_url":"https://api.github.com/repos/cloud-fan/spark/git/trees{/sha}","statuses_url":"https://api.github.com/repos/cloud-fan/spark/statuses/{sha}","languages_url":"https://api.github.com/repos/cloud-fan/spark/languages","stargazers_url":"https://api.github.com/repos/cloud-fan/spark/stargazers","contributors_url":"https://api.github.com/repos/cloud-fan/spark/contributors","subscribers_url":"https://api.github.com/repos/cloud-fan/spark/subscribers","subscription_url":"https://api.github.com/repos/cloud-fan/spark/subscription","commits_url":"https://api.github.com/repos/cloud-fan/spark/commits{/sha}","git_commits_url":"https://api.github.com/repos/cloud-fan/spark/git/commits{/sha}","comments_url":"https://api.github.com/repos/cloud-fan/spark/comments{/number}","issue_comment_url":"https://api.github.com/repos/cloud-fan/spark/issues/comments{/number}","contents_url":"https://api.github.com/repos/cloud-fan/spark/contents/{+path}","compare_url":"https://api.github.com/repos/cloud-fan/spark/compare/{base}...{head}","merges_url":"https://api.github.com/repos/cloud-fan/spark/merges","archive_url":"https://api.github.com/repos/cloud-fan/spark/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/cloud-fan/spark/downloads","issues_url":"https://api.github.com/repos/cloud-fan/spark/issues{/number}","pulls_url":"https://api.github.com/repos/cloud-fan/spark/pulls{/number}","milestones_url":"https://api.github.com/repos/cloud-fan/spark/milestones{/number}","notifications_url":"https://api.github.com/repos/cloud-fan/spark/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/cloud-fan/spark/labels{/name}","releases_url":"https://api.github.com/repos/cloud-fan/spark/releases{/id}","deployments_url":"https://api.github.com/repos/cloud-fan/spark/deployments","created_at":"2014-05-12T07:32:26Z","updated_at":"2016-01-26T22:38:29Z","pushed_at":"2016-02-06T02:23:49Z","git_url":"git://github.com/cloud-fan/spark.git","ssh_url":"git@github.com:cloud-fan/spark.git","clone_url":"https://github.com/cloud-fan/spark.git","svn_url":"https://github.com/cloud-fan/spark","homepage":null,"size":141366,"stargazers_count":0,"watchers_count":0,"language":"Scala","has_issues":false,"has_downloads":true,"has_wiki":false,"has_pages":false,"forks_count":1,"mirror_url":null,"open_issues_count":0,"forks":1,"open_issues":0,"watchers":0,"default_branch":"master"}},"base":{"label":"apache:master","ref":"master","sha":"875f5079290a06c12d44de657dfeabc913e4a303","user":{"login":"apache","id":47359,"avatar_url":"https://avatars.githubusercontent.com/u/47359?v=3","gravatar_id":"","url":"https://api.github.com/users/apache","html_url":"https://github.com/apache","followers_url":"https://api.github.com/users/apache/followers","following_url":"https://api.github.com/users/apache/following{/other_user}","gists_url":"https://api.github.com/users/apache/gists{/gist_id}","starred_url":"https://api.github.com/users/apache/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/apache/subscriptions","organizations_url":"https://api.github.com/users/apache/orgs","repos_url":"https://api.github.com/users/apache/repos","events_url":"https://api.github.com/users/apache/events{/privacy}","received_events_url":"https://api.github.com/users/apache/received_events","type":"Organization","site_admin":false},"repo":{"id":17165658,"name":"spark","full_name":"apache/spark","owner":{"login":"apache","id":47359,"avatar_url":"https://avatars.githubusercontent.com/u/47359?v=3","gravatar_id":"","url":"https://api.github.com/users/apache","html_url":"https://github.com/apache","followers_url":"https://api.github.com/users/apache/followers","following_url":"https://api.github.com/users/apache/following{/other_user}","gists_url":"https://api.github.com/users/apache/gists{/gist_id}","starred_url":"https://api.github.com/users/apache/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/apache/subscriptions","organizations_url":"https://api.github.com/users/apache/orgs","repos_url":"https://api.github.com/users/apache/repos","events_url":"https://api.github.com/users/apache/events{/privacy}","received_events_url":"https://api.github.com/users/apache/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/apache/spark","description":"Mirror of Apache Spark","fork":false,"url":"https://api.github.com/repos/apache/spark","forks_url":"https://api.github.com/repos/apache/spark/forks","keys_url":"https://api.github.com/repos/apache/spark/keys{/key_id}","collaborators_url":"https://api.github.com/repos/apache/spark/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/apache/spark/teams","hooks_url":"https://api.github.com/repos/apache/spark/hooks","issue_events_url":"https://api.github.com/repos/apache/spark/issues/events{/number}","events_url":"https://api.github.com/repos/apache/spark/events","assignees_url":"https://api.github.com/repos/apache/spark/assignees{/user}","branches_url":"https://api.github.com/repos/apache/spark/branches{/branch}","tags_url":"https://api.github.com/repos/apache/spark/tags","blobs_url":"https://api.github.com/repos/apache/spark/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/apache/spark/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/apache/spark/git/refs{/sha}","trees_url":"https://api.github.com/repos/apache/spark/git/trees{/sha}","statuses_url":"https://api.github.com/repos/apache/spark/statuses/{sha}","languages_url":"https://api.github.com/repos/apache/spark/languages","stargazers_url":"https://api.github.com/repos/apache/spark/stargazers","contributors_url":"https://api.github.com/repos/apache/spark/contributors","subscribers_url":"https://api.github.com/repos/apache/spark/subscribers","subscription_url":"https://api.github.com/repos/apache/spark/subscription","commits_url":"https://api.github.com/repos/apache/spark/commits{/sha}","git_commits_url":"https://api.github.com/repos/apache/spark/git/commits{/sha}","comments_url":"https://api.github.com/repos/apache/spark/comments{/number}","issue_comment_url":"https://api.github.com/repos/apache/spark/issues/comments{/number}","contents_url":"https://api.github.com/repos/apache/spark/contents/{+path}","compare_url":"https://api.github.com/repos/apache/spark/compare/{base}...{head}","merges_url":"https://api.github.com/repos/apache/spark/merges","archive_url":"https://api.github.com/repos/apache/spark/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/apache/spark/downloads","issues_url":"https://api.github.com/repos/apache/spark/issues{/number}","pulls_url":"https://api.github.com/repos/apache/spark/pulls{/number}","milestones_url":"https://api.github.com/repos/apache/spark/milestones{/number}","notifications_url":"https://api.github.com/repos/apache/spark/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/apache/spark/labels{/name}","releases_url":"https://api.github.com/repos/apache/spark/releases{/id}","deployments_url":"https://api.github.com/repos/apache/spark/deployments","created_at":"2014-02-25T08:00:08Z","updated_at":"2016-02-07T06:55:18Z","pushed_at":"2016-02-07T07:02:57Z","git_url":"git://github.com/apache/spark.git","ssh_url":"git@github.com:apache/spark.git","clone_url":"https://github.com/apache/spark.git","svn_url":"https://github.com/apache/spark","homepage":null,"size":410704,"stargazers_count":7369,"watchers_count":7369,"language":"Scala","has_issues":false,"has_downloads":true,"has_wiki":false,"has_pages":false,"forks_count":6696,"mirror_url":"git://git.apache.org/spark.git","open_issues_count":366,"forks":6696,"open_issues":366,"watchers":7369,"default_branch":"master"}},"_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/10917"},"html":{"href":"https://github.com/apache/spark/pull/10917"},"issue":{"href":"https://api.github.com/repos/apache/spark/issues/10917"},"comments":{"href":"https://api.github.com/repos/apache/spark/issues/10917/comments"},"review_comments":{"href":"https://api.github.com/repos/apache/spark/pulls/10917/comments"},"review_comment":{"href":"https://api.github.com/repos/apache/spark/pulls/comments{/number}"},"commits":{"href":"https://api.github.com/repos/apache/spark/pulls/10917/commits"},"statuses":{"href":"https://api.github.com/repos/apache/spark/statuses/315af8cdb87a8033e86f2c6c318b615f79bfc3da"}}}}