我有两个应用程序在一个服务器上运行,它们执行 headless (headless)浏览任务。每次浏览时,Xvfb 进程并没有死,而是变成了僵尸。我可以用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?我该如何解决这个问题?
版本信息:
- xorg-x11-server-Xvfb-1.15.0-26.el6.centos.i686
- CentOS 6.5 版(最终版)
- ruby-2.0.0-p353
- rvm 1.25.25
- selenium-webdriver (2.45.0, 2.44.0)
- watir-webdriver (0.7.0)
- headless (headless)(2.1.0)
最佳答案
更新: A pull request提交给 Headless 等待默认被接受。哇!
headless (headless) gem changed the way it starts, stops (kills) and verifies the Xvfb process .虽然我不完全确定为什么,但在 CentOS 6 上,这会导致进程僵尸化。由于 .destroy
之前没有引起问题,它一定与 headless 启动 Xvfb 进程(同时重写)的方式有关。
但是gem同时引入了.destroy_sync
,等待进程死亡,不产生僵尸。
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.
关于Ruby headless watir-webdriver Xvfb 僵尸,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30754358/