[CASSANDRA-5884] Improve offheap memory performance

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0.1
• Assignee: T Jake Luciani
• Reporter: T Jake Luciani

Authors

T Jake Luciani

Reviewers

Jonathan Ellis

• Created: 13/Aug/13 16:08
• Updated: 16/Apr/19 09:32
• Resolved: 14/Aug/13 12:09

Description

Currently getting data to and from offheap is slow due to individual calls to getByte() and putByte()

The following patch makes this a single call and is 10x faster

benchmark:
     [java]  0% Scenario{vm=java, trial=0, benchmark=GetBytesOld} 82266.48 ns; σ=2532.87 ns @ 10 trials
     [java] 50% Scenario{vm=java, trial=0, benchmark=GetBytesNew} 7876.95 ns; σ=489.78 ns @ 10 trials
     [java]
     [java]   benchmark    us linear runtime
     [java] GetBytesOld 82.27 ==============================
     [java] GetBytesNew  7.88 ==
     [java]
     [java] vm: java
     [java] trial: 0