Performance issue in ByteBufferUtil
-----------------------------------
Key: CASSANDRA-3286
URL: https://issues.apache.org/jira/browse/CASSANDRA-3286
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: T Jake Luciani
Assignee: T Jake Luciani
Priority: Minor
Fix For: 1.0.1
Profiling 1.0 we can see ByteBufferUtil.compareUnsigned is slow.
{code}
Excl. Incl. Incl. Incl. Name
User CPU User CPU Sync Wait Sync Wait
sec. sec. sec. Count
318.491 318.491 1.400 113786 <Total>
40.561 40.561 0. 0 <Unknown>
18.972 19.093 0. 0 <static>@0xd949 (<libpthread-2.5.so>)
17.718 18.730 0. 0 sun.security.provider.MD5.implCompress(byte[], int)
14.396 14.396 0. 0 __pthread_cond_signal
8.908 8.908 0. 0
org.apache.cassandra.utils.ByteBufferUtil.compareUnsigned(java.nio.ByteBuffer,
java.nio.ByteBuffer)
7.435 7.688 0. 0 __pthread_cond_timedwait
7.127 7.182 0. 0 <static>@0xd8c9 (<libpthread-2.5.so>)
7.072 7.072 0. 0 jbyte_disjoint_arraycopy
6.764 39.065 0. 0 org.apache.cassandra.utils.ReducingIterator.computeNext()
6.533 17.575 0. 0
java.util.concurrent.ConcurrentSkipListMap.doPut(java.lang.Object,
java.lang.Object, boolean)
6.346 6.346 0. 0 com.sun.crypto.provider.SunJCE_c.a(byte[], int, byte[], int)
5.378 5.433 0. 0 send
4.861 6.643 0.000 1
org.apache.cassandra.utils.ByteBufferUtil.read(java.io.DataInput, int)
4.410 9.260 0. 0
org.apache.commons.collections.iterators.CollatingIterator.least()
4.355 4.355 0. 0 java.io.ByteArrayOutputStream.write(int)
4.300 6.632 0. 0 java.io.ByteArrayOutputStream.write(byte[], int, int)
3.827 30.190 0. 0
org.apache.cassandra.dht.RandomPartitioner.decorateKey(java.nio.ByteBuffer)
3.783 23.954 0. 0
org.apache.cassandra.utils.FBUtilities.hash(java.nio.ByteBuffer[])
3.783 3.860 0. 0 <static>@0xd486c (<libc-2.5.so>)
3.739 3.739 0. 0 clock_gettime
{code}
We can avoid the problem when the ByteBuffer has a backing array
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