Parrot is a virtual machine designed to efficiently compile and execute bytecode for dynamic languages. Parrot currently hosts a variety of language implementations in various stages of completion, including Tcl, Javascript, Ruby, Lua, Scheme, PHP, Python, Perl 6, APL, and a .NET bytecode translator. Parrot is not about parrots, though we are rather fond of them for obvious reasons.

GSoC 2014 - Report 10

Hey everyone!

This week I completed the part of my task that required me to export the internally needed CallContext vtable methods ( These exported methods are now included in src/call/*.c to improve the performance, since these methods are now being directly called.

In the previous week, I had finished fixing the headers to omit the obj check for CallContext ATTR accessors. But I had made these changes manually by fixing include/pmc/pmc_callcontext.h.

GSoC 2014 - Report 9

Hey everyone!

Through this post, I will be sharing my progress towards the task -

I have completed the part of the task that required me to inline the CallContext ATTR accessors to omit the obj check. For now, I have manually edited include/pmc/pmc_callcontext.h to fix the macro definitions.
However, after completing the remaining task and ascertaining an improvement in speed performance, I plan to improve pmc2c to automatically generate this fix.

GSoC 2014 - Report 8

Hey everyone!

Let me share this week's progress.

Earlier this week, I finished my tests with Parrot for its releases 2.7 - 3.0. Including rurban's profiling, we now have data (reliable to some extent) for the commits in this range. The main objective for the profiling was to determine the highest overhead to be targeted next for refactor.

(For the list of all the identified overheads, please take a look at -

Parrot 6.6.0 "Parrothead" released!

As a dreamer of dreams and a travelin' man,
I have chalked up many a mile.
Read dozens of books about heroes and crooks,
And I've learned much from both of their styles.
    -- Heard playing in Margaritaville bar,
       in Orlando after YAPC::NA::2014.

On behalf of the Parrot team, I'm proud to announce Parrot 6.6.0, also known as "Parrothead". Parrot is a virtual machine aimed at running all dynamic languages.

GSoC 2014 - Report 7

Hey everyone!

My this week's work involves testing. With this work, we are trying to figure out the commits that slowed down Parrot during its releases 2.7 - 3.0. To do this, I am running the tool provided in parrot-bench. rurban is helping me out with these tests to save time (since I have got a slow machine) and also to cross-check results.

GSoC 2014 - Report 6

Hey everyone!

I am happy to announce that my task #2 ( is now complete and the issue has been closed.

To give a gist of what has been done -

The goal was to optimize the pmc2c compiler, more specifically the PCCMETHODs, by avoiding the run-time overhead of having to call two costly C functions per method call. These C functions were:-

Parrot_pcc_fill_params_from_c_args(interp, _call_object, sig, &_self, args...);
Parrot_pcc_set_call_from_c_args(interp, _call_object, rettype, result);

GSoC 2014 - Report 5

Hey everyone!

I will catch you up on my work this week. As I had mentioned in my last post (, I have already started working on a new task (

Since, this work requires me to make changes to the Pmc2c compiler, I am required to code in Perl. I am however, new to Perl and thus, spent quite some time getting used to some basic coding in Perl this week.

GSoC 2014 - Report 4

Hey everyone!

Let me share the progress for this week.

I have successfully finished my task #1 that required me to add write barriers to the PMC methods (

For this task, I had finished most of the work last week itself (

This week I mostly verified all the WB annotations for one last time and it did help me to fix some bugs and incorrect WBs. All this work is now part of our latest release for Parrot 6.5.0 and we have achieved a speed improvement of around 2.5% - 5% through this task!

Parrot 6.5.0 "Black-winged Lovebird" Released

Parrot 6.5.0 is available on Parrot's FTP site, or by following the download instructions.
For those who want to hack on Parrot or languages that run on top of Parrot, we recommend our organization page on GitHub, or you can go directly to the official Parrot Git repo on Github

GSoC 2014 - Report 3

Hey everyone!

There is a lot of good news to share this week! Our GSoC task #1 ( is a success!! :D

So, I have been spending a lot of time looking into and fixing 95 pmc files with a calculated number of 2230 methods for core PMCs alone...

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