[fedora-java] Re: Performance issues with gcc-4.1.0-0.10.i386
Andrew Overholt writes:
I am seeing some performance issues with the latest gcc rawhide RPM set.
I tried a build of Eclipse with them and it took 650 minutes 42 seconds
where it used to take about 20 - 30 minutes (this is just for the
bytecode, BTW). I watched the log a bit as it built but nothing stood
out to me as taking more time than anything else.
My build did eventually finish, however, so I upgraded to those Eclipse
RPMs and tried to run Eclipse. Startup is very slow. I used OProfile
to grab some data and put it here:
http://overholt.ca/eclipsestartup-opreport.txt
Then I reset OProfile and grabbed some data while using Eclipse for a
few minutes. I have two small projects checked out and I cleaned them,
opened a file (which took a very long time), moved around a bit in the
file, closed it, and reopened it (which took much less time). Here is
the report from that session:
http://overholt.ca/eclipseusage-opreport.txt
The top of both reports is similar. Here's the top of the startup
report:
samples % app name symbol name
1814289 28.7922 libgcc_s-4.1.0-20051221.so.1 __deregister_frame_info_bases
This is usually called when a library is unloaded. I can't imagine
any reason why this might happen when running gij.
The quickest way to find this is to run under gdb and see where
__deregister_frame_info_bases is called from.
I have seen this once, and it turned out to be a bug in our interface
with the garbage collector. But as far as I am aware little has
changed since the last gcc build thath might affect this.
Andrew.