0004657: Compilation of ocaml fails in labltk with parallel jobs

(0004779)
glondu (reporter)
2008-11-29 15:48

When redirecting the output, the failure is not systematic. I managed to get a failure log with the following command:

{ ./configure && MAKEFLAGS=-j3 make world; } 2>&1|tee /tmp/build-failure.log

(0004781)
garrigue (manager)
2008-11-30 02:33

The Objective Caml distribution has never supported parallel make.
You can see it by looking at the target "all" in the main Makefile, which
includes no sequencing whatsoever.
You can try to use parallel make, but you are on your own when it fails...

(0004782)
glondu (reporter)
2008-11-30 15:47

If dependencies between targets were properly defined, "all" as it is now doesn't startle me (but of course, it wouldn't do the same as "world"). Nonetheless, the explicit sequencing in other targets (world, coreboot, etc.) suggests some support for parellel make. And it seems to me that ocamlbuild also supports parallel builds.

Do you have any idea on how hard it would be to make OCaml parallel-build-safe?

(0004787)
doligez (manager)
2008-12-03 14:16

It's not hard to twiddle the makefiles to get a parallel make to work, but it's very hard to have any level of confidence about the parallel-safety. I don't know if there are tools to analyze makefiles for this.

So maybe someday our makefiles will be parallelizable but don't hold your breath.

(0004984)
pipping (reporter)
2009-06-07 11:08

This is a duplicate of bug 0004243.

Issue History
Date Modified	Username	Field	Change
2008-11-29 15:36	glondu	New Issue
2008-11-29 15:36	glondu	File Added: build.log
2008-11-29 15:48	glondu	Note Added: 0004779
2008-11-29 15:48	glondu	File Added: build-failure.log
2008-11-30 02:33	garrigue	Note Added: 0004781
2008-11-30 15:47	glondu	Note Added: 0004782
2008-12-03 14:16	doligez	Note Added: 0004787
2008-12-03 14:16	doligez	Severity	major => feature
2008-12-03 14:16	doligez	Status	new => acknowledged
2009-06-07 11:08	pipping	Note Added: 0004984
2009-06-08 18:13	doligez	Relationship added	duplicate of 0004243

Notes
(0004779) glondu (reporter) 2008-11-29 15:48	When redirecting the output, the failure is not systematic. I managed to get a failure log with the following command: { ./configure && MAKEFLAGS=-j3 make world; } 2>&1\|tee /tmp/build-failure.log

(0004781) garrigue (manager) 2008-11-30 02:33	The Objective Caml distribution has never supported parallel make. You can see it by looking at the target "all" in the main Makefile, which includes no sequencing whatsoever. You can try to use parallel make, but you are on your own when it fails...

(0004782) glondu (reporter) 2008-11-30 15:47	If dependencies between targets were properly defined, "all" as it is now doesn't startle me (but of course, it wouldn't do the same as "world"). Nonetheless, the explicit sequencing in other targets (world, coreboot, etc.) suggests some support for parellel make. And it seems to me that ocamlbuild also supports parallel builds. Do you have any idea on how hard it would be to make OCaml parallel-build-safe?

(0004787) doligez (manager) 2008-12-03 14:16	It's not hard to twiddle the makefiles to get a parallel make to work, but it's very hard to have any level of confidence about the parallel-safety. I don't know if there are tools to analyze makefiles for this. So maybe someday our makefiles will be parallelizable but don't hold your breath.

(0004984) pipping (reporter) 2009-06-07 11:08	This is a duplicate of bug 0004243.