JSC is very slow when using cryptography

[sirpy]

Question

When using javascript based crypto libraries such as hdkey (uses crypto.createHmac)
performance is very low
generating 10 addresses with hdkey takes about 1.8 seconds with latest JSC. for comparison:
bundled JSC around 4 sec
react-native-v8 without JIT also around 4 sec
ios simulator 100mili
react-native-v8 with JIT 200mili

Maybe the jsc-bundle is not really configured for JIT? any other explanation for the slow runtime on JSC?

[Andrew Goodale]

What version of JSC are you using? Some versions of 241213 had JIT completely turned off.

[sirpy]

i've tried the packaged version with 0.61 and the latest npm jsc-android
the packaged version is 4 seconds latest npm is 1.8 seconds
where can i see the JIT flag?

[Kudo Chien]

JSC has four tiers of JIT executions.
(Reference from https://webkit.org/blog/9329/a-new-bytecode-format-for-javascriptcore/)

• Low Level Interpreter (LLInt): the start-up interpreter
• Baseline JIT: a template JIT
• DFG JIT: a low-latency optimizing compiler
• FTL JIT: a high-throughput optimizing compiler

For balancing between resource usage and performance, we only enable LLInt and Baseline JIT.
If you would like to check the build flags, here it is

[sirpy]

thanks! i'll try these

[Khoa Nguyen]

Hi @Kudo, @sirpy

So if we want to enable all the JITs, we just simply need to set DENABLE_DFG_JIT=ON and DENABLE_FTL_JIT=ON?

[sirpy]

@sirpy I dont recall the results or if I was able to build and use JSC with JIT.
We are still using v8, so I guess it still has the best performance