1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision;
import com.yahoo.config.provision.NodeResources;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
/**
* @author bratseth
*/
public class NodeSkewTest {
private static final double d = 0.0001;
@Test
public void testNodeSkewComputation() {
// No skew
assertEquals(0, Node.skew(r(6, 4, 2), r(6, 4, 2)), d);
assertEquals(0, Node.skew(r(6, 4, 2), r(0, 0, 0)), d);
assertEquals(0, Node.skew(r(6, 4, 2), r(3, 2, 1)), d);
// Extremely skewed
assertEquals(0.2222, Node.skew(r(6, 4, 2), r(0, 4, 0)), d);
// A little less
assertEquals(0.1666, Node.skew(r(6, 4, 2), r(3, 4, 0)), d);
// A little less
assertEquals(0.0555, Node.skew(r(6, 4, 2), r(3, 4, 1)), d);
// The same, since being at half and full is equally skewed here
assertEquals(0.0555, Node.skew(r(6, 4, 2), r(3, 4, 2)), d);
// Almost not skewed
assertEquals(0.0062, Node.skew(r(6, 4, 2), r(5, 4, 2)), d);
// Skew is scale free
assertEquals(0.0201, Node.skew(r( 6, 4, 2), r(1, 1, 1)), d);
// - all dimensions twice as large
assertEquals(0.0201, Node.skew(r(12, 8, 4), r(2, 2, 2)), d);
// - just one dimension twice as large
assertEquals(0.0201, Node.skew(r(12, 4, 2), r(2, 1, 1)), d);
}
private NodeResources r(double vcpu, double memGb, double diskGb) {
return new NodeResources(vcpu, memGb, diskGb, 1);
}
}
|
