[fedora-java] Performance issues with gcc-4.1.0-0.10.i386

[Andrew Overholt]

Hi,

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
1764105  27.9958  libgcc_s-4.1.0-20051221.so.1 add_fdes
1040376  16.5105  libgcc_s-4.1.0-20051221.so.1 size_of_encoded_value
693446   11.0048  libgcc_s-4.1.0-20051221.so.1 classify_object_over_fdes
539261    8.5579  libgcc_s-4.1.0-20051221.so.1 __ucmpdi2

I can get more information if you need.

Thanks,

Andrew