我在一台服务器上运行两个应用程序来执行无头浏览任务。每次浏览时,Xvfb进程都不会死亡,而是成为一个僵尸。我可以通过以下脚本确认这一点。
require 'headless'
require 'watir-webdriver'
require 'yaml'
zombies_at_start = `ps axo pid=,stat= | awk '$2~/^Z/ { print $1 }'`.split("\n").count
5.times do
begin
d = YAML.load_file("/path/to/config/headless.yml")['build_number'] #=> "98"
h = Headless.new(:display => d)
h.start
b = Watir::Browser.new :firefox
b.goto 'http://google.com'
sleep(0.5)
ensure
b.close
h.destroy
end
sleep(0.5)
end
zombies_at_end = `ps axo pid=,stat= | awk '$2~/^Z/ { print $1 }'`.split("\n").count
puts "Created #{zombies_at_end - zombies_at_start} more zombies."
#=> Created 5 more zombies.
为什么呢?我该如何解决这个问题?
版本信息:
答案 0 :(得分:3)
更新:提交给Headless默认等待的pull request已被接受。宇!
宝石无头changed the way it starts, stops (kills) and verifies the Xvfb process。虽然我不完全确定原因,但在CentOS 6上,这会导致流程僵尸化。由于.destroy
以前没有引起问题,因此它必须与无头启动Xvfb进程(同时重写)的方式有关。
然而,gem同时引入了.destroy_sync
,等待进程死亡,并且不会创建僵尸。
require 'headless'
require 'watir-webdriver'
require 'yaml'
zombies_at_start = `ps axo pid=,stat= | awk '$2~/^Z/ { print $1 }'`.split("\n").count
5.times do
begin
d = YAML.load_file("/path/to/config/headless.yml")['build_number'] #=> "98"
h = Headless.new(:display => d)
h.start
b = Watir::Browser.new :firefox
b.goto 'http://google.com'
sleep(0.5)
ensure
b.close
# h.destroy
h.destroy_sync
end
sleep(0.5)
end
zombies_at_end = `ps axo pid=,stat= | awk '$2~/^Z/ { print $1 }'`.split("\n").count
puts "Created #{zombies_at_end - zombies_at_start} more zombies."
#=> Created 0 more zombies.