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作者 | 正文 |
发表时间:2012-10-09
1 java中对象的成员变量越多,在new的时候是否会占更多的内存? 2 hibernate中在SQLQuery.list()方法和类似findByExample的方法后是否需要调用flush和clear,有些地方说需要调用,否则会有内存的问题,我不确定。 dump: 1. LeakSize TotalSize Size Analysis Name Address 971389703 971396517 24 Responsible for 971,396,517 bytes (57.8 %) of Java heap org/apache/commons/collections/SequencedHashMap$Entry 0x82b2c5e8 1,258,104,359 (74.86%) [40] 1 java/util/HashMap 0x7f53ffc8 1,258,104,319 (74.86%) [64] 2 array of [Ljava/util/HashMap$Entry; 0x83c2bc88 1,258,104,184 (74.86%) [24] 2 java/util/HashMap$Entry 0x83c2bd40 1,258,104,160 (74.86%) [30] 2 org/springframework/orm/hibernate3/SessionHolder 0x83c2be48 1,258,104,100 (74.86%) [28] 2 java/util/Collections$SynchronizedMap 0x83c2bed8 1,258,104,072 (74.86%) [40] 1 java/util/HashMap 0x83c2bf48 1,258,104,032 (74.86%) [8] 1 array of [Ljava/util/HashMap$Entry; 0x83c2bf70 1,258,104,024 (74.86%) [24] 2 java/util/HashMap$Entry 0x83c2bf88 1,258,104,000 (74.86%) [80] 11 org/hibernate/impl/SessionImpl 0x82b0ee38 1,258,102,913 (74.86%) [78] 13 org/hibernate/engine/StatefulPersistenceContext 0x82b0f308 980,349,426 (58.33%) [17] 2 org/hibernate/util/IdentityMap 0x82b2c110 980,349,405 (58.33%) [24] 2 org/apache/commons/collections/SequencedHashMap 0x82b2c588 971,396,517 (57.8%) [24] 2 org/apache/commons/collections/SequencedHashMap$Entry 0x82b2c5e8 971,396,406 (57.8%) [24] 4 org/apache/commons/collections/SequencedHashMap$Entry 0x7f619578 87 (0%) [24] 4 org/apache/commons/collections/SequencedHashMap$Entry 0xffffffffe5e9b240 2. LeakSize TotalSize Size Analysis Name Address 277752297 277752297 2097152 277,752,297 bytes (16.53 %) of Java heap is used by 220,347 instances of java/util/HashMap$Entry array of [Ljava/util/HashMap$Entry; 0xb5cbe268 1,258,104,387 (74.86%) [28] 3 java/lang/ThreadLocal$ThreadLocalMap$Entry 0x7ba45208 1,258,104,359 (74.86%) [40] 1 java/util/HashMap 0x7f53ffc8 1,258,104,319 (74.86%) [64] 2 array of [Ljava/util/HashMap$Entry; 0x83c2bc88 1,258,104,184 (74.86%) [24] 2 java/util/HashMap$Entry 0x83c2bd40 1,258,104,160 (74.86%) [30] 2 org/springframework/orm/hibernate3/SessionHolder 0x83c2be48 1,258,104,100 (74.86%) [28] 2 java/util/Collections$SynchronizedMap 0x83c2bed8 1,258,104,072 (74.86%) [40] 1 java/util/HashMap 0x83c2bf48 1,258,104,032 (74.86%) [8] 1 array of [Ljava/util/HashMap$Entry; 0x83c2bf70 1,258,104,024 (74.86%) [24] 2 java/util/HashMap$Entry 0x83c2bf88 1,258,104,000 (74.86%) [80] 11 org/hibernate/impl/SessionImpl 0x82b0ee38 1,258,102,913 (74.86%) [78] 13 org/hibernate/engine/StatefulPersistenceContext 0x82b0f308 980,349,426 (58.33%) [17] 2 org/hibernate/util/IdentityMap 0x82b2c110 277,752,337 (16.53%) [40] 1 java/util/HashMap 0x82b2c0c0 277,752,297 (16.53%) [2,097,152] 220,347 array of [Ljava/util/HashMap$Entry; 0xb5cbe268 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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