[Bug 1916536] Re: increase in SUBBUCKETS has performance impact

[Brian Murray]

The Groovy Gorilla has reached end of life, so this bug will not be
fixed for that release

** Changed in: golang-1.14 (Ubuntu Groovy)
       Status: New => Won't Fix

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Title:
  increase in SUBBUCKETS has performance impact

Status in golang-1.14 package in Ubuntu:
  New
Status in golang-1.15 package in Ubuntu:
  New
Status in golang-1.14 source package in Focal:
  New
Status in golang-1.15 source package in Focal:
  Invalid
Status in golang-1.14 source package in Groovy:
  Won't Fix
Status in golang-1.15 source package in Groovy:
  Invalid
Status in golang-1.14 source package in Hirsute:
  New
Status in golang-1.15 source package in Hirsute:
  New

Bug description:
  [impact]

  a negative performance impact is found with the increase in SUBBUCKETS

  [test case]

  TBD

  [regression potential]

  any regression would likely cause performance issues

  [scope]

  this is needed only for golang 1.14 and 1.15; the patch is not added
  in 1.13 or earlier, nor in 1.16.

  Specifically, this is needed in f/g/h in the specific golang versions
  as shown:

  $ grep -E 'SUBBUCKETS += 32'  */*/golang-*/src/cmd/link/internal/ld/pcln.go
  golang-1.14/focal/golang-1.14-1.14.3/src/cmd/link/internal/ld/pcln.go:	SUBBUCKETS    = 32
  golang-1.14/groovy/golang-1.14-1.14.7/src/cmd/link/internal/ld/pcln.go:	SUBBUCKETS    = 32
  golang-1.14/hirsute/golang-1.14-1.14.7/src/cmd/link/internal/ld/pcln.go:	SUBBUCKETS    = 32
  golang-1.15/hirsute/golang-1.15-1.15.8/src/cmd/link/internal/ld/pcln.go:	SUBBUCKETS    = 32

  [other info]

  this was added to golang-1.14 with the patch:
  debian/patches/0001-cmd-link-add-support-for-external-linking-on-linux-r.patch
  and golong-1.15 with the similar patch:
  debian/patches/fc3e6af10297b424175b44d2274de04c5f0b9e82.patch

  There does not appear to be any documentation or explanation for why
  the patch modifies SUBBUCKETS.

  Upstream, this appears to have been done with the commit
  15eaa870e14195c17dbb4be0d11bc40dba94ff22, which does not change
  SUBBUCKETS.

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