https://sourceware.org/bugzilla/show_bug.cgi?id=21677
Bug ID: 21677
Summary: ld 2.27 has unexplained 10x performance improvement in
some cases
Product: binutils
Version: 2.26
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: mail at nh2 dot me
Target Milestone: ---
Hi,
the GHC Haskell compiler uses ld to link its binaries.
There is currently a performance regression in GHC 8.2 that makes linking with
ld 40x slower than it was in GHC 8.0.
But we found that ld 2.27 made this regression 10x less bad than ld 2.26:
https://ghc.haskell.org/trac/ghc/ticket/13739#comment:21
https://ghc.haskell.org/trac/ghc/attachment/ticket/13739/T13739-check-ld-output
My question:
Are you aware of any performance improvement in the 2.27 release that would
explain the 10x speedup?
I read through
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=ld/NEWS;hb=refs/tags/binutils-2_27
but couldn't find any.
While it's great that ld 2.27 got faster, we would really like to know what
made it faster.
That might help us figure out our bug, and other users of ld would probably
also benefit from knowing about it.
Thanks!
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