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Re: Illegal C++

From: Han-Wen Nienhuys
Subject: Re: Illegal C++
Date: Mon, 10 Oct 2005 18:17:35 +0200
User-agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929)

Wiz Aus wrote:
Even if it did use pre-compiled scheme, because lilypond supports compiling scores that contain Scheme code, it would still require effectively interpretive processing, which is not doubt a large reason for it's less-than-blinding-fast operation.

The problem is not so much in the Scheme execution, because the real work is done in C++ routines. The problem is rather that data structures are completely dynamic, so reading and writing a variable isn't reading and writing memory, but rather walking linked lists or lookups in hashtables. IIRC, I benchmarked Rosegarden (which is completely written in C++), to be only 3 to 5 times faster than LilyPond, which is not that much when you realize how much more LilyPond does.

Anyway, I think this this all besides the point, unless someone comes up with a constructive idea how to improve the situation.

 Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen

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