Public bug reported:
[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.
** Affects: golang-1.14 (Ubuntu)
Importance: Medium
Status: New
** Affects: golang-1.15 (Ubuntu)
Importance: Medium
Status: New
** Affects: golang-1.14 (Ubuntu Focal)
Importance: Medium
Status: New
** Affects: golang-1.15 (Ubuntu Focal)
Importance: Undecided
Status: Invalid
** Affects: golang-1.14 (Ubuntu Groovy)
Importance: Medium
Status: New
** Affects: golang-1.15 (Ubuntu Groovy)
Importance: Undecided
Status: Invalid
** Affects: golang-1.14 (Ubuntu Hirsute)
Importance: Medium
Status: New
** Affects: golang-1.15 (Ubuntu Hirsute)
Importance: Medium
Status: New
** Also affects: golang-1.14 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: golang-1.14 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: golang-1.15 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: golang-1.14 (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: golang-1.15 (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: golang-1.14 (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: golang-1.15 (Ubuntu Groovy)
Importance: Undecided
Status: New
** Changed in: golang-1.15 (Ubuntu Focal)
Status: New => Invalid
** Changed in: golang-1.15 (Ubuntu Groovy)
Status: New => Invalid
** Changed in: golang-1.15 (Ubuntu Hirsute)
Importance: Undecided => Medium
** Changed in: golang-1.14 (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: golang-1.14 (Ubuntu Groovy)
Importance: Undecided => Medium
** Changed in: golang-1.14 (Ubuntu Hirsute)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1916536
Title:
increase in SUBBUCKETS has performance impact
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