view test/gc/g1/TestRegionAlignment.java @ 10246:194f52aa2f23

7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap Summary: Refactor G1's hot card cache and card counts table into their own files. Simplify the card counts table, including removing the encoding of the card index in each entry. The card counts table now has a 1:1 correspondence with the cards spanned by heap. Space for the card counts table is reserved from virtual memory (rather than C heap) during JVM startup and is committed/expanded when the heap is expanded. Changes were also reviewed-by Vitaly Davidovich. Reviewed-by: tschatzl, jmasa
author johnc
date Thu, 09 May 2013 11:16:39 -0700
parents f14063dcd52a
children
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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test TestRegionAlignment.java
 * @bug 8013791
 * @summary Make sure that G1 ergonomics pick a heap size that is aligned with the region size
 * @run main/othervm -XX:+UseG1GC -XX:G1HeapRegionSize=32m -XX:MaxRAM=555m TestRegionAlignment
 *
 * When G1 ergonomically picks a maximum heap size it must be aligned to the region size.
 * This test tries to get the VM to pick a small and unaligned heap size (by using MaxRAM=555) and a
 * large region size (by using -XX:G1HeapRegionSize=32m). This will fail without the fix for 8013791.
 */
public class TestRegionAlignment {
    public static void main(String[] args) { }
}