Hywel Richards wrote: > No matter how I try, I can't seem to get a library profile from sprof > on CentOS5. > > Does anyone know if sprof actually works on CentOS5? I'd be very > interested to hear if anyone is using it successfully. > > At the moment I'm trying something like this to get the dump: > > LD_LIBRARY_PATH=. LD_PROFILE=libmy.so ./mymain > > where libmy.so is the library I want to profile, and mymain is the > executable which links to it. > > This appears to create the profile dump successfully (which appears at > /var/tmp/libmy.so.profile), but when I try to get a readable profile > using sprof it fails: > > $ sprof libmy.so /var/tmp/libmy.so.profile > sprof: failed to load shared object `libmy.so' > > I have a CentOS4 machine here, and doing the above on that works fine, > but I've had no luck at all on CentOS5 (all currently up-to-date). > > Can anyone help? (Please!) > Given that I can get this to work well on a CentOS4 machine, and I have tried lots of minor trivial changes to command-line, etc, but still fail on CentOS5, does anyone know what I can do or where I can go to progress this further? My current guess is that it is a (probably very trivial) bug, although I recognise there still the possibility that this is simply a usage problem (however, if that is so, the usage since centos4 has clearly changed). A more straightforward program I might have a go at debugging, but I don't feel competent on this one - sprof is part of the glibc package. The glibc pages (http://www.gnu.org/software/libc/bugs.html) say that bugs should be reported to the distribution project first. I would also be interested to know what the general policy is regarding what to do about bugs on Centos. I presume there is no way for people involved in centos to make changes directly, otherwise the distribution stops being a clone, so bugs/fixes on the centos bugzilla presumably get fed back to redhat at some point, and then eventually trickle down? (Is there a webpage somewhere explaining how this works? I know the FAQ states that there is no relationship with redhat, but surely they must exploit the bug reports somehow). Anyway, should I report this on the CentOS bugzilla? Would someone take it up if I did? I assume that reporting it to redhat would be inappropriate. If not centos, should I go on to report it to glibc? Hywel.