Hello,
I've been measuring the performance of the java 11 built in AES-NI instructions
and, with NI switched on through JAVA_TOOL_OPTIONS =
‘-XX:+UnlockDiagnosticVMOptions -XX:+UseAES -XX:+UseAESIntrinsics’.
I run the benchmarks that are present in the open jdk itself through ‘java
-server -jar target/jmh-jdk-microbenchmarks-1.0-SNAPSHOT.jar
org.openjdk.bench.javax.crypto.full.AESBench.encrypt -p
algorithm=AES/CTR/NoPadding’.
When I compare the results and calculate the throughput in GB/s, for 16k
encoding blocks, I get about 40% of the throughput when compared to the openssl
performance test through ‘openssl speed -evp aes-128-ctr’.
I don't seem to find a decent comparison/benchmark that describes which
percentage of the maximum performance to expect with jdk 11, but 40 % seems
rather low. Does anybody know of a comparison (or might have an idea where I go
wrong, because, as these are off the shelf perf tools I would think not a lot
can be tweaked there).
For reference, the openssl test reports this:
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
16384 bytes
aes-128-ctr 583576.76k 1907072.21k 4144141.40k 5612174.68k 6252751.53k
6258371.24k
So, for 16k blocks, 6258371k bytes per second
The openjdk benchmark reports this
Benchmark (algorithm) (dataSize) (keyLength) (provider) Mode
Cnt Score Error Units
AESBench.encrypt AES/CTR/NoPadding 16384 128 thrpt
100 168066.873 ± 488.873 ops/s
Out of which I conclude that, for 16k blocks, the perf here is 168066 * 16k or
about 2689056k bytes per second or about 40 % of the openssl number, taking
some liberty with rounding the numbers.
Is that expected or am I drawing the wrong conclusions? Or am I missing
something?
When I print the options, the jvm reports that the AES intrinsics are being
used :
java -XX:+PrintFlagsFinal | grep -i AES
intx MaxBCEAEstimateLevel = 5
{product} {default}
intx MaxBCEAEstimateSize = 150
{product} {default}
bool UseAES = true
{product} {default}
System specs : Ubuntu 18.04
openjdk version "10.0.2" 2018-07-17
OpenJDK Runtime Environment (build 10.0.2+13-Ubuntu-1ubuntu0.18.04.4)
OpenJDK 64-Bit Server VM (build 10.0.2+13-Ubuntu-1ubuntu0.18.04.4, mixed mode)
Kasper
