Question

5

PID's associated with Chromium multiple tabs and windows?

rated 0 times [ 5] [ 0] / answers: 1 / hits: 3314 / 2 Years ago, thu, february 17, 2022, 2:23:57

While reading about Linux, I got a $netstat -tulpn to find out which process is listening Upon a port. I got:

anupam@JAZZ:~$ sudo netstat -tulpn

[sudo] password for anupam: 

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      1827/dnsmasq    

tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      1992/cupsd      

tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      976/mysqld      

tcp6       0      0 :::80                   :::*                    LISTEN      1342/apache2    

tcp6       0      0 ::1:631                 :::*                    LISTEN      1992/cupsd      

tcp6       0      0 :::3689                 :::*                    LISTEN      2582/rhythmbox  

udp        0      0 0.0.0.0:631             0.0.0.0:*                           943/cups-browsed

udp        0      0 0.0.0.0:37759           0.0.0.0:*                           697/avahi-daemon: r

udp        0      0 0.0.0.0:58502           0.0.0.0:*                           1822/dhclient   

udp        0      0 0.0.0.0:5353            0.0.0.0:*                           3039/chromium-brows

udp        0      0 0.0.0.0:5353            0.0.0.0:*                           697/avahi-daemon: r

udp        0      0 127.0.1.1:53            0.0.0.0:*                           1827/dnsmasq    

udp        0      0 0.0.0.0:68              0.0.0.0:*                           1822/dhclient   

udp6       0      0 :::5353                 :::*                                697/avahi-daemon: r

udp6       0      0 :::44452                :::*                                697/avahi-daemon: r

udp6       0      0 :::16540                :::*                                1822/dhclient

There is a single PID for googleChromium, while I have opened multiple windows and multiple tabs in it.
I read that chromium uses processes rather than threads http://blog.chromium.org/2008/09/multi-process-architecture.html, as port numbers are used for application to application connection (so I understand that there is a single PID for chromium).
But what about PIDs for other processes associated with Chromium??

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

lowovey

Add To Favorites

Follow

Total Points: 287

Total Questions: 98

Total Answers: 117

Location: Bosnia and Herzegovina

Member since Thu, Jan 14, 2021

3 Years ago

lowovey questions

1 Setup DHCP server on Ubuntu 20.04?

Fri, Nov 4, 22, 22:59, 2 Years ago

1 How to remove the Title Bar of Gnome applications

Sat, Nov 27, 21, 01:22, 3 Years ago

1 How can I change the Dropbox folder location using only the command line/remote access?

Mon, Aug 8, 22, 10:03, 2 Years ago

1 Ubuntu installer cannot detect Windows 11 or partitions for dual install

Wed, May 11, 22, 12:07, 2 Years ago

1 Ubuntu 20.04 on WSL2: Folder owner & group are being reset after each start

Mon, Aug 16, 21, 16:43, 3 Years ago

View All

answered 2 Years ago izecaptur · Accepted Answer

The Chromium browser indeed uses different processes to render your opened tabs:

$ps -aef

[...]

sylvain   6432  2223 20 11:19 ?        00:00:02 chromium-browser --enable-pinch                          

sylvain   6441  6432  0 11:19 ?        00:00:00 /usr/lib/chromium-browser/chrome-sandbox /usr/lib/chromium-browser/chromium-browser --type=zygote

sylvain   6442  6441  1 11:19 ?        00:00:00 chromium-browser --type=zygote                          

sylvain   6446  6442  0 11:19 ?        00:00:00 chromium-browser --type=zygote                          

sylvain   6469  6432  8 11:19 ?        00:00:00 chromium-browser --type=gpu-process --channel=6432.0.2058149686 --supports-dual-gpus=false --gpu-driver-bug-workarounds=1,11,13,15 --disable-accelerated-video-decode --gpu-vendor-

sylvain   6489  6446  1 11:19 ?        00:00:00 /usr/lib/chromium-browser/chro                          

sylvain   6509  6469  0 11:19 ?        00:00:00 chromium-browser --type=gpu-broker                                                                                                                                                 

root      6516     2  0 11:19 ?        00:00:00 [kworker/0:0]

sylvain   6517  6446 10 11:19 ?        00:00:00 /usr/lib/chromium-browser/chro                          

sylvain   6541  6446  5 11:20 ?        00:00:00 /usr/lib/chromium-browser/chro

In the above example pid 6517 and 6541 are my opened tabs, but like you netstat only returns one network process for Chromium (6432):

$ sudo netstat -tulpn

[sudo] password for sylvain: 

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      1966/dnsmasq    

tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      3804/cupsd      

tcp        0      0 0.0.0.0:538             0.0.0.0:*               LISTEN      1363/gdomap     

tcp6       0      0 ::1:631                 :::*                    LISTEN      3804/cupsd      

udp        0      0 0.0.0.0:45410           0.0.0.0:*                           2158/dhclient   

udp        0      0 0.0.0.0:5353            0.0.0.0:*                           6432/chromium-brows

udp        0      0 0.0.0.0:5353            0.0.0.0:*                           933/avahi-daemon: r

udp        0      0 127.0.1.1:53            0.0.0.0:*                           1966/dnsmasq    

udp        0      0 0.0.0.0:68              0.0.0.0:*                           2158/dhclient   

udp        0      0 0.0.0.0:68              0.0.0.0:*                           1715/dhclient   

udp        0      0 192.168.1.36:123        0.0.0.0:*                           2956/ntpd       

udp        0      0 192.168.1.40:123        0.0.0.0:*                           2956/ntpd       

udp        0      0 127.0.0.1:123           0.0.0.0:*                           2956/ntpd       

udp        0      0 0.0.0.0:123             0.0.0.0:*                           2956/ntpd       

udp        0      0 0.0.0.0:49400           0.0.0.0:*                           933/avahi-daemon: r

udp        0      0 0.0.0.0:538             0.0.0.0:*                           1363/gdomap     

udp        0      0 0.0.0.0:631             0.0.0.0:*                           1187/cups-browsed

udp        0      0 0.0.0.0:10080           0.0.0.0:*                           1715/dhclient   

udp6       0      0 :::60417                :::*                                933/avahi-daemon: r

udp6       0      0 :::5353                 :::*                                933/avahi-daemon: r

udp6       0      0 :::47845                :::*                                2158/dhclient   

udp6       0      0 :::8012                 :::*                                1715/dhclient   

udp6       0      0 fe80::3ea9:f4ff:fe1:123 :::*                                2956/ntpd       

udp6       0      0 fe80::3e97:eff:fe81:123 :::*                                2956/ntpd       

udp6       0      0 ::1:123                 :::*                                2956/ntpd       

udp6       0      0 :::123                  :::*                                2956/ntpd

So why?

Chromium uses a multi-process architecture, which isolates render processes from the browser process but...

Chromium maintains a single instance of the resource dispatcher, which is shared across all render processes, and runs within the browser kernel process.

Each render process communicates with the resource dispatcher via IPC.

Sources:

Chrome network architecture in a nutshell

Chromium Inter-process Communication (IPC)