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author | Eric Wong <e@80x24.org> | 2018-08-20 20:56:52 +0000 |
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committer | Eric Wong <e@80x24.org> | 2018-08-20 21:09:42 +0000 |
commit | 0ed746e9b9f03a5067aa97cc4ed54b9e42443727 (patch) | |
tree | ea9d4ae65457ce57902208295e22d8d61bad0e88 /test | |
parent | d03dd4e9e4ff29689752b7c82202008fefaf1210 (diff) | |
download | unicorn-0ed746e9b9f03a5067aa97cc4ed54b9e42443727.tar.gz |
We have never had any need for pipes with the default 64K capacity on Linux. Our pipes are only used for tiny writes in signal handlers and to perform parent shutdown detection. With the current /proc/sys/fs/pipe-user-pages-soft default, only 1024 pipes can be created by an unprivileged user before Linux clamps down the pipe size to 4K (a single page) for newly-created pipes[1]. So avoid penalizing OTHER pipe users who could benefit from the increased capacity and use only a single page for ourselves. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/pipe.c?h=v4.18#n642
Diffstat (limited to 'test')
-rw-r--r-- | test/unit/test_util.rb | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/unit/test_util.rb b/test/unit/test_util.rb index dc6302e..9d5d4ef 100644 --- a/test/unit/test_util.rb +++ b/test/unit/test_util.rb @@ -102,4 +102,29 @@ class TestUtil < Test::Unit::TestCase } tmp.close! end + + def test_pipe + r, w = Unicorn.pipe + assert r + assert w + + return if RUBY_PLATFORM !~ /linux/ + + begin + f_getpipe_sz = 1032 + IO.pipe do |a, b| + a_sz = a.fcntl(f_getpipe_sz) + b_sz = b.fcntl(f_getpipe_sz) + assert_kind_of Integer, a_sz + r_sz = r.fcntl(f_getpipe_sz) + assert_equal Raindrops::PAGE_SIZE, r_sz + assert_operator a_sz, :>=, r_sz + end + rescue Errno::EINVAL + # Linux <= 2.6.34 + end + ensure + w.close + r.close + end end |