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From "Johnny Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2569) Fix org.apache.pig.test.TestInvoker.testSpeed
Date Fri, 03 Aug 2012 01:14:02 GMT

    [ https://issues.apache.org/jira/browse/PIG-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427790#comment-13427790
] 

Johnny Zhang commented on PIG-2569:
-----------------------------------

Andrey, yes Clover is enabled when test was running. I think it is a good idea to disable
this test when Clover is enabled, in build.xml
                
> Fix org.apache.pig.test.TestInvoker.testSpeed
> ---------------------------------------------
>
>                 Key: PIG-2569
>                 URL: https://issues.apache.org/jira/browse/PIG-2569
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Johnny Zhang
>            Assignee: Dmitriy V. Ryaboy
>
> the Pig unit test org.apache.pig.test.TestInvoker.testSpeed pass sometimes and fail sometimes.
I think this test need further polish, look at the code:
> {noformat}
> @Test
>     public void testSpeed() throws IOException, SecurityException, ClassNotFoundException,
NoSuchMethodException {
>         EvalFunc<Double> log = new Log();
>         Tuple tup = tf_.newTuple(1);
>         long start = System.currentTimeMillis();
>         for (int i=0; i < 1000000; i++) {
>             tup.set(0, (double) i);
>             log.exec(tup);
>         }
>         long staticSpeed = (System.currentTimeMillis()-start);
>         start = System.currentTimeMillis();
>         log = new InvokeForDouble("java.lang.Math.log", "Double", "static");
>         for (int i=0; i < 1000000; i++) {
>             tup.set(0, (double) i);
>             log.exec(tup);
>         }
>         long dynamicSpeed = System.currentTimeMillis()-start;
>         System.err.println("Dynamic to static ratio: "+((float) dynamicSpeed)/staticSpeed);
>         assertTrue( ((float) dynamicSpeed)/staticSpeed < 5);
>     }
> {noformat}
> I understand this test is trying to prevent the initicialization time of InvokeForDouble
doesn't take too long, but the ratio 5 is hardcoded, and there is no solid logic behind it
why it is 5. For my understand, when the server resouce is low, ratio could be larger than
5, but it doesn't mean code has problem. For our case, the code never change, but it pass
in the first run, but fail in the second run.

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