[bug #65533] gmake-4.4.1 has a performance regression: at least the nwchem project now builds much slower

[Yuri]

Follow-up Comment #2, bug #65533 (group make):

Hi Paul,

[comment #1 comment #1:]
> Since I don't have any idea what the "nwchem" project is or how its
makefiles work and you haven't provided any short examples, I can't say for
sure.

Thank you for your insight.

For the record:
NWChem is a popular computational chemistry software package:
https://www.nwchem-sw.org/
Here is their top-level makefile:
https://github.com/nwchemgit/nwchem/blob/master/src/GNUmakefile

Assuming that your explanation is correct, the gmake process should consume
close to 100% of CPU much of the time doing these variable expansions.
However, I don't observe this. gmake's CPU usage is mostly <1%, and all
processes listed by top look like this most of the time:

  PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME    WCPU
COMMAND
36100 nobody        1  68    0    13M  2136K piperd   1   0:00   0.70% gmake
65966 nobody        1  68    0    13M  2272K wait     4   0:00   0.00% gmake
46544 nobody        1  68    0    13M  1948K wait     3   0:00   0.00% gmake
61005 nobody        1  20    0    13M  1316K wait     1   0:00   0.00% make
83976 nobody        1  55    0    13M  1684K wait     5   0:00   0.00% sh
77926 nobody        1  68    0    14M  2952K wait     4   0:00   0.00% bash
46543 nobody        1  20    0    13M  1712K wait     4   0:00   0.00% sh
77925 nobody        1  68    0    13M  1912K wait     2   0:00   0.00% sh
77927 nobody        1  68    0    12M  1544K piperd   6   0:00   0.00% cut

It looks like they invoke a lot of external processes (cut, sed, perl, awk),
and this is somehow extremely slower than before when there is a lot of them.


Yuri



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