Date: Tue, 10 Mar 2020 12:08:57 +0100 From: "Kaisrlík, Jan" <jan.kaisrlik@...st.com> To: musl@...ts.openwall.com, Kaisrlík@...t70.net, Jan <jan.kaisrlik@...st.com> Subject: Re: musl and jemalloc support On Tue, Mar 10, 2020 at 10:59 AM Szabolcs Nagy <nsz@...t70.net> wrote: > * 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. > Thank you for your answer. Glad to hear that. > > > > > 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) > All my components are built against musl for armv7 architecture. > > 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.) > Sorry, I kept libpthread from one of my previous tests which is slightly misleading in this case. My system has only one libpthread library coming from musl. > > > > > 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 > Content of type "text/html" skipped
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