http://llvm.org/bugs/show_bug.cgi?id=5260
Summary: llvm-ld: loading .o files from .a files very slow
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
When doing LTO, and trying to link llc, it takes 1m48s (with -disable-opt).
If I link just the .a files, it takes 1m25s.
If I extract the .a files to .o files and link the .o files it takes 22s.
Extracting the .a files to .o files takes 0.3s with llvm-ar, so llvm-ld is
wasting time somewhere.
To reproduce:
tar xjvf foo.tar.bz2 && cd foo
time llvm-ld -disable-opt *.a
time for i in *.a; do llvm-ar x $i; done
time llvm-ld -disable-opt *.o
The latter is much faster than llvm-ld on the .a files!
Note: I've run the tests in /tmp, and my /tmp is in RAM (using tmpfs), so there
is no disk I/O penalty involved.
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