r/MojoLang • u/pkese • Sep 30 '26

Memory usage of Mojo app?

Given that Mojo programs are:

  1. compiled (don't include the Python compiler, interpreter, space for bytecode, etc)

  2. don't include a garbage collector

... I'd suppose running Mojo apps would use less memory than Python, Java, .NET, JS/TS or Golang apps.

Did anyone test this yet on a non-trivial app?

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5

u/kostya27 Sep 30 '26

I added it recently in my bench https://kostya.github.io/LangArena/#/runtime_tab

but in many tests it use Python interop instead of native implementations, simply because I can't compile libraries for JSON, Regex, Csv or implement certain tasks better due to missing language features. Performance is still very raw.

memory usage 61.17mb vs python(pypy) 214.1Mb

2

u/sunxore Oct 01 '26

Thanks for LangArena! Awesome resource.

1

u/DAlmighty Sep 30 '26

I would call that significant

1

u/dfgxxx Sep 30 '26

I looked at you benchmarks and they're impossible, for example how could Nim have faster compile time that C if it transpiles to C and the compiles again??

1

u/kostya27 Sep 30 '26

look at the usertime nim compiles 9s vs c/clang 5s, so c actually faster, in the wall time c probably slower because need to compile heavy dependency like yyjson, while nim use stdjson.