Date: Sat, 20 Apr 2013 13:46:39 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Automating libc comparison Hi, Here's a project I'd like to do but I thought I probably should spend the time actually coding/maintaining, so I figured I'd post it in case anyone else wants to help or do it: Basic idea is to automate the libc comparison (http://www.etalabs.net/compare_libcs.html) so that we can keep it up to date and add new libcs (BSD? Bionic? etc.) and tests to it. A good part of the challenge is doing tests in a fairly libc-agnostic way so the same tests could be applied with little effort to other libcs. Some ideas: - Complete .a set size can be computed with -Wl,--whole-archive and all the standard -l options listed in POSIX. - Complete .so set might be possible with ldd or readelf and knowledge of the library path. - Most overhead/bloat measurements are easy with an appropriate test program and /proc. - Resource-exhaustion tests would need test programs and could simulate exhaustion with resource limits. - Performance comparisons all presently come from libc-bench, but there's a lot of room for replacing/improving them. It would be nice for some of them to be converted to units like MB/sec. - The bottom half of the table is a lot less measurable, but at least some things like features might be able to be partially-automated. Rich
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