http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47916
Summary: Using -flto leads to halved performance of unrar
unarchiver
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: t.ar...@mailcity.com
Created attachment 23483
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23483
unrar sources
Using the last released GCC snapshot (gcc-4.6-20110226) and the following
compilation flags performance halves.
GCC flags used:
CXXFLAGS=-O2 -march=i686 -mtune=generic [-flto|]
LDFLAGS=[-flto|]
Execution times:
With -flto:
time ./unrar t -inul testarchive.rar
real 0m33.496s
user 0m33.171s
sys 0m0.140s
Without -flto:
time ./unrar t -inul testarchive.rar
real 0m16.326s
user 0m16.242s
sys 0m0.067s
___________________________________________________________________
This bug will probably attract zero attention from GCC developers but since
-flto is not meant to behave such badly I'm posting it.
You can produce a rar archive using Rar for Linux
(http://rarlabs.com/download.htm):
rar a -m5 -mdG -r -s archive.name.rar file1 file2 file3 ... etc.
