Date: Tue, 10 Mar 2020 10:59:49 +0100 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Cc: Kaisrlík@...t70.net, Jan <jan.kaisrlik@...st.com> Subject: Re: musl and jemalloc support * Kaisrlík, Jan <jan.kaisrlik@...st.com> [2020-03-10 10:32:08 +0100]: > I would like to ask about the support of external malloc and jemalloc. > I find an old mail in ML claiming that support is not there and using > external malloc function can potentially cause problems and a > thread on jemalloc saying the same. On the other hand, I find a lot > of pages comparing speed like pages  and also I noticed that Musl > claims "replacement of malloc is now allowed/supported" statement in > changelog . So, my expectation is Musl from version 1.1.20 supports > the loading of external malloc function and it is working. Is my > assumption correct? Does it have any limitations, e.g., it has to be > done in compilation time, is LD_PRELOAD supported? yes, it just works. > > The reason why I'm asking is that some apps started crashing with a > weird coredump from the moment I used > LD_PRELOAD=/usr/lib/libjemalloc.so.2:/usr/lib/libpthread.so. the preloaded libraries obviously have to be built against musl. (in some cases a glibc linked library would work, i would expect a glibc linked malloc library to work with musl on x86_64, but there is no guarantee) the fact that you have libpthread.so means it's not a musl system and preloading a libpthread.so from another libc is expected to crash. (even on other systems you should not just preload libpthread, but libjemalloc should have it in its dependencies if needed.) > > Thank you for your answer. > > The best, > Jan > > : https://www.openwall.com/lists/musl/2014/08/08/11 > : https://github.com/jemalloc/jemalloc/issues/1443 > : https://users.rust-lang.org/t/optimizing-rust-binaries-observation-of-musl-versus-glibc-and-jemalloc-versus-system-alloc/8499/7 > : https://git.musl-libc.org/cgit/musl/tree/WHATSNEW#n1916
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