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Feature #5291

Enabling GC Profiler GC_PROFILE_MORE_DETAIL and CALC_EXACT_MALLOC_SIZE

Added by cfis (Charlie Savage) about 9 years ago. Updated about 9 years ago.

Status:
Closed
Priority:
Normal
Assignee:
-
Target version:
[ruby-core:39326]

Description

I would like to hook ruby-prof into the new GC profiler. However, by default a lot of the profile stats are disabled by these two defines in gcc.c.

#define GC_PROFILE_MORE_DETAIL 0
#define CALC_EXACT_MALLOC_SIZE 0

To turn on these stats, you have to modify the ruby source code! That is a high barrier for most people.

So would it be possible to:

  • Set them to 1 by default. Or would this be too much of a performance hit?

  • or -

  • Remove the lines entirely and then change the logic in the file from this:

#if GC_PROFILE_MORE_DETAIL

To this:

#if defined?(GC_PROFILE_MORE_DETAIL)

Then when buildig Ruby you could tell the compiler to define the symbols (-DGC_PROFILE_MORE_DETAIL).

  • or -

  • Add these two defines to the ./configure script so they end up in config.h. That would make it easy for users to enable them if they wish, and would be also allow ruby-prof to use them too.

Would a patch be accepted to do this?

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