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IDProjectCategoryView StatusDate SubmittedLast Update
0005754OCamlOCamlbuild (the tool)public2012-09-03 02:042012-11-19 01:21
Reportermeyer 
Assigned Tomeyer 
PriorityhighSeveritymajorReproducibilityalways
StatusassignedResolutionopen 
PlatformOSOS Version
Product Version4.00.0 
Target Version4.00.2+devFixed in Version 
Summary0005754: Not optimal parallel build of dependencies
DescriptionFor this example:

a1.ml:
a2.ml:
a3.ml:
a4.ml:
b1.ml:
open A1
open A2
b2.ml:
open A3
open A4
c.ml:
open B1
open B2

we have this dependency graph:

A1    A2   A3    A4
  \  /       \  /
   B1         B2
     \__   __/
        \ /
         C


Of course it's apparent that for -j 4 option, ocamlbuild should trivially recognize this case and build A1 & A2 & A3 & A4 in parallel, and later B1 & B2 also in parallel and then finally C, but currently it does not.

What it does is to build A1 & A2 in paraller, then build B1, then build A3 & A4 and the build B2, and finally C.
TagsNo tags attached.
Attached Files

- Relationships
has duplicate 0005796resolvedgasche ocamlbuild doesn't parallelize the build 
related to 0004934assignedmeyer ocamlbuild takes up to one minute to scan already done parts of Coq sources 

-  Notes
(0008299)
berenger (reporter)
2012-10-23 10:36

 Ocamlbuild doesn't parallelize the build.
Using -j 1 to -j 8 with a step size of 1 shows that
there is almost no parallelization of the build.
(0008526)
meyer (developer)
2012-11-19 01:21

 I agree that the tool currently is does not extremely parallelize the build. This fact mostly comes from the reason of handling dynamic dependencies automatically.

- Issue History
Date Modified Username Field Change
2012-09-03 02:04 meyer New Issue
2012-09-03 02:04 meyer Status new => assigned
2012-09-03 02:04 meyer Assigned To => meyer
2012-09-03 02:06 meyer Description Updated View Revisions
2012-09-03 02:07 meyer Description Updated View Revisions
2012-09-03 02:07 meyer Description Updated View Revisions
2012-09-03 02:07 meyer Description Updated View Revisions
2012-09-03 02:08 meyer Relationship added related to 0004934
2012-09-03 02:10 meyer Summary not optimal parraler build of dependencies => not optimal parallel build of dependencies
2012-09-03 02:10 meyer Description Updated View Revisions
2012-09-03 02:11 meyer Priority normal => high
2012-09-03 02:17 meyer Summary not optimal parallel build of dependencies => Not optimal parallel build of dependencies
2012-09-06 19:22 frisch Target Version 4.00.1+dev => 4.00.2+dev
2012-10-23 10:12 gasche Relationship added has duplicate 0005796
2012-10-23 10:36 berenger Note Added: 0008299
2012-11-19 01:21 meyer Note Added: 0008526

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