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From: Hleb Valoshka <375gnu@gmail.com>
To: raindrops@librelist.org
Subject: raindrops tests fail on smp, fork is to blame
Date: Sat, 23 Jun 2012 00:06:30 +0300
Message-ID: <CAAB-Kc=wfr0EQJ7h=YJ1J5NmAogEYbXmzy9f9Q6H21+-mntJ9w@mail.gmail.com> (raw)
In-Reply-To: <CAAB-Kc=wfr0EQJ7h=YJ1J5NmAogEYbXmzy9f9Q6H21+-mntJ9w@mail.gmail.com>


Raindrops build hangs on debian's build servers, but not on my local
box. This occurs when tests are run under ruby1.9.1. You can see
example of build log in [0]. It took a lot of time to understand that
the main difference between build and my box is number of CPUs:
debian's servers are smp, my kvm box had only 1 cpu.

Today I decided to start kvm with option -smp 2, and voila! build
hung. The more tests with fork() you have the higher probability build
will hang. When all tests are enabled, the probability of hang is
about 100% when tests are run by gem2deb (it loads all test files
simultaneously) and about 5-10% with "make test". When test_concurrect
from test_middleware.rb and test_incr_shared, test_incr_decr and
test_evaporate_with_fork from test_raindrops.rb are disabled build
runs without hangs.

Any ideas?

[0] https://buildd.debian.org/status/fetch.php?pkg=ruby-raindrops&arch=kfreebsd-amd64&ver=0.9.0-1&stamp=1340389966

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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-22 21:06 Hleb Valoshka [this message]
2012-06-22 22:29 ` Eric Wong
2012-06-23 11:59   ` Hleb Valoshka

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