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Subject: build_dir_reuse when smoking causes massive slowdown in CPAN
I'm running an unattended smoker on Windows and noticed a while ago that it was behaving a bit oddly: I would get literally thousands of lines like this: prerequisite module[overload] not known prerequisite module[Carp] not known prerequisite module[overload] not known prerequisite module[Carp] not known prerequisite module[overload] not known prerequisite module[Carp] not known Now this i could live with, but additionally these errors also introduced considerable delay until it would restart processing, leading to a single smoking taking more than a day at times. (I found out this evening that's due to an intentional sleep 2 in So, i set out tonight to at least get a quickfix in for myself and figure out why this kept happening. While im not *entirely* sure why it happens, i think i have reasonably useful instructions for reproducing the problem. I am not sure whether CPAN::Reporter needs to be set up, i ran out of time for today. (CPAN::SQLite may also be related to this happening, no evidence for it, just a gut feeling i got while stepping through code.) Any way, reproduction steps: ===================================================================== First, set up build dir reusing: ----- o conf init build_dir_reuse <build_dir_reuse> ... sessions? [no] yes ----- Test-Fatal may not be installed. Instead, only set up a build dir for CPAN to find later on: $ perl -MCPAN -e "$CPAN::Config->{test_report} = 1;CPAN::Index->reload; $CPAN::META->reset_tested;test( 'RJBS/Test-Fatal-0.003.tar.gz' );" Next, run the test for DepMan, which *must* find and use the already built Test-Fatal, but may not be in the same process: $ perl -MCPAN -e "$CPAN::Config->{test_report} = 1;CPAN::Index->reload; $CPAN::META->reset_tested;test( 'DROLSKY/Package- DeprecationManager-0.10.tar.gz' );" Which results in this: ----- CPAN: CPAN::SQLite loaded ok (v0.199) CPAN: YAML::XS loaded ok (v0.34) Going to read 4 yaml files from C:\Perl/cpan/build/ Database was generated on Mon, 07 Feb 2011 21:05:28 GMT CPAN: Time::HiRes loaded ok (v1.9721) .........................................................DONE Restored the state of 1 (in 0.0145 secs) Running make for D/DR/DROLSKY/Package-DeprecationManager-0.10.tar.gz Has already been unwrapped into directory C:\Perl\cpan\build\Package- DeprecationManager-0.10-l3TJ5A
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---- Unsatisfied dependencies detected during ---- ---- DROLSKY/Package-DeprecationManager-0.10.tar.gz ---- Test::Fatal [build_requires] prerequisite module[overload] not known Running make test Delayed until after prerequisites Running test for module 'Test::Fatal' ----- ===================================================================== One of the reasons for the prerequisite message occuring is that CPAN finds the previous build dir for Test-Fatal, which contains prerequisite information for the dist and then calls this on it: $dist->color_cmd_tmps This function then proceeds to go through all the prereqs, trying to expand the module names into module objects and delving into them if possible, or throwing the mentioned error. The only skipped prereq is 'perl' itself. This expanding seems to happen via CPAN::SQLite and in this case is result-less for overload, causing an error message and a two-second sleep. Interestingly it goes fine when Carp shows up as a dependency in this case, although i've seen it act like overload acts here. I have no idea why this is happening, but i hope this will help you figure it out. If it's not enough, let me know and i'll try to dig up any info you need.

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