On Thu, 20 Jul 2023 16:47:14 GMT, Maurizio Cimadamore <mcimadam...@openjdk.org> wrote:
>> On a newer processor/OS (Alder Lake/Ubuntu 22.04) I see a bit more >> difference: >> >> >> Benchmark Mode Cnt Score Error Units >> ByteArray.readByte thrpt 5 680397.046 ± 27504.022 ops/ms >> ByteArray.readByteFromBuffer thrpt 5 576449.569 ± 3633.135 ops/ms >> ByteArray.readInt thrpt 5 685419.089 ± 6740.268 ops/ms >> ByteArray.readIntFromBuffer thrpt 5 542887.418 ± 2863.907 ops/ms >> ByteArray.readLong thrpt 5 687949.037 ± 3510.613 ops/ms >> ByteArray.readLongFromBuffer thrpt 5 548120.950 ± 5461.145 ops/ms >> >> >> But still far from 2x. > > For full disclosure, I'm running the benchmark using the JDK microbenchmark > support. My JMH version is a bit behind. I've updated it to 1.35 (which is > the latest I see being used around here) and getting similar results. By the way, I ran `LoopOverNonConstantHeap` on the 3700x platform, and the performance of ByteBuffer was also poor: Benchmark (polluteProfile) Mode Cnt Score Error Units LoopOverNonConstantHeap.BB_get false avgt 30 1.855 ± 0.092 ns/op LoopOverNonConstantHeap.BB_get true avgt 30 1.655 ± 0.010 ns/op LoopOverNonConstantHeap.BB_loop false avgt 30 0.254 ± 0.001 ms/op LoopOverNonConstantHeap.BB_loop true avgt 30 0.254 ± 0.001 ms/op LoopOverNonConstantHeap.segment_get false avgt 30 2.333 ± 0.043 ns/op LoopOverNonConstantHeap.segment_get true avgt 30 2.362 ± 0.006 ns/op LoopOverNonConstantHeap.segment_loop false avgt 30 0.251 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop true avgt 30 0.251 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_instance false avgt 30 0.254 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_instance true avgt 30 0.254 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_instance_unaligned false avgt 30 0.254 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_instance_unaligned true avgt 30 0.254 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_readonly false avgt 30 0.252 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_readonly true avgt 30 0.251 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_slice false avgt 30 0.251 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_slice true avgt 30 0.252 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_unaligned false avgt 30 0.251 ± 0.001 ms/op LoopOverNonConstantHeap.segment_loop_unaligned true avgt 30 0.252 ± 0.001 ms/op LoopOverNonConstantHeap.unsafe_get false avgt 30 0.628 ± 0.004 ns/op LoopOverNonConstantHeap.unsafe_get true avgt 30 0.628 ± 0.003 ns/op LoopOverNonConstantHeap.unsafe_loop false avgt 30 0.255 ± 0.001 ms/op LoopOverNonConstantHeap.unsafe_loop true avgt 30 0.256 ± 0.001 ms/op ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/14636#discussion_r1269733363
