[llvm-bugs] [Bug 35536] lld might be creating DSOs that takes more time to load for the dynamic loader than those created by gold

via llvm-bugs llvm-bugs at lists.llvm.org
Thu May 23 20:04:06 PDT 2019


https://bugs.llvm.org/show_bug.cgi?id=35536

Fangrui Song <i at maskray.me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
                 CC|                            |i at maskray.me
             Status|NEW                         |RESOLVED

--- Comment #8 from Fangrui Song <i at maskray.me> ---
I think this has been fixed for a while. We experienced slowdown of many lld
linked programs a few months ago, but various testing says it has been fixed.

One significant thing was the redundant ld-linux-x86-64.so.2 DT_NEEDED entry in
DSOs (D55902/r349849). In the case of 5000+ DSOs, the extra DT_NEEDED in every
DSO directly depended by the executable made glibc ld.so tens of seconds slower
at startup. glibc has O(n^2) string comparison in several places.
The bloom filter Shift2 was improved in D55971/r349966

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