hi submit@bugs.debian.orgMaybe I didn't describe the issue so clear.Package: gccVersion : gcc (Debian 4.9.2-10) 4.9.2 or gcc (Debian 4.7.4-3) 4.7.4The problem: the libtcmalloc_minimal.so complied by gcc 4.7.4 got higher latency than complied by gcc 4.9.2tcmalloc version: gperftools 2.1system: debian jessie 8.2BRsyongsu