# Why socket for communication between master and worker used the so large memory? **URL:** \ **Category:** NGINX\ **Created:** [March 29, 2013, 11:05am UTC](https://www.ruby-forum.com/t/why-socket-for-communication-between-master-and-worker-used-the-so-large-memory/227815 "2013-03-29T11:05:41Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![MCoder](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/94ad74/32.png) [@MCoder](https://www.ruby-forum.com/u/MCoder)\ **Post date:** [March 29, 2013, 11:05am UTC](https://www.ruby-forum.com/t/why-socket-for-communication-between-master-and-worker-used-the-so-large-memory/227815/1 "2013-03-29T11:05:41Z")
my nginx is just a http tunul proxy http connection, and max connection is just lower than 100. # ps aux root 19849 0.0 0.0 18028 2452 ? Ss 2012 0:00 nginx: master process /usr/local/qqwebsrv/nginx/sbin/nginx nobody 25389 0.1 0.0 19752 4104 ? S Mar25 9:07 nginx: worker process nobody 25390 0.1 0.0 19752 4104 ? S Mar25 9:03 nginx: worker process nobody 25391 0.1 0.0 19752 4108 ? S Mar25 8:46 nginx: worker process nobody 25392 0.1 0.0 19760 4116 ? S Mar25 8:58 nginx: worker process # lsof | grep nginx | grep socket nginx 19849 root 3w unix 0xffff8102b7574380 1677964948 socket nginx 19849 root 4u unix 0xffff81047e144f00 1677964949 socket nginx 19849 root 6u unix 0xffff8102dce9dcc0 1677964950 socket nginx 19849 root 7u unix 0xffff81047e532340 1677964951 socket nginx 19849 root 8u unix 0xffff81027785a980 1677964954 socket nginx 19849 root 9u unix 0xffff81047bd8ac80 1677964955 socket nginx 19849 root 10u unix 0xffff8102b7574900 1677964957 socket nginx 19849 root 12w unix 0xffff81010e285100 1677964958 socket nginx 25389 nobody 3u unix 0xffff8102dce9dcc0 1677964950 socket nginx 25389 nobody 4u unix 0xffff81047e144f00 1677964949 socket nginx 25389 nobody 7u unix 0xffff81027785a980 1677964954 socket nginx 25389 nobody 8u unix 0xffff8102b7574900 1677964957 socket nginx 25390 nobody 3u unix 0xffff8102b7574380 1677964948 socket nginx 25390 nobody 4u unix 0xffff81027785a980 1677964954 socket nginx 25390 nobody 6u unix 0xffff8102b7574900 1677964957 socket nginx 25390 nobody 7u unix 0xffff81047e532340 1677964951 socket nginx 25391 nobody 3u unix 0xffff8102b7574380 1677964948 socket nginx 25391 nobody 4u unix 0xffff8102b7574900 1677964957 socket nginx 25391 nobody 6u unix 0xffff8102dce9dcc0 1677964950 socket nginx 25391 nobody 9u unix 0xffff81047bd8ac80 1677964955 socket nginx 25392 nobody 3u unix 0xffff8102b7574380 1677964948 socket nginx 25392 nobody 6u unix 0xffff8102dce9dcc0 1677964950 socket nginx 25392 nobody 8u unix 0xffff81027785a980 1677964954 socket nginx 25392 nobody 12u unix 0xffff81010e285100 1677964958 socket # lsof |awk '$1==“nginx” && $NF == “socket” {n[$6]=$7} END {for (i in n) {m += n[i]} print m / (1024 \* 1024 \* 1024)}’ 12.5018 # netstat -na | grep ESTABLISHED | wc -l 87 ---
**Author:** ![MCoder](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/94ad74/32.png) [@MCoder](https://www.ruby-forum.com/u/MCoder)\ **Post date:** [March 29, 2013, 11:41am UTC](https://www.ruby-forum.com/t/why-socket-for-communication-between-master-and-worker-used-the-so-large-memory/227815/2 "2013-03-29T11:41:55Z")
Hello! On Fri, Mar 29, 2013 at 06:04:54PM +0800, MCoder wrote: > nobody 25391 0.1 0.0 19752 4108 ? S Mar25 8:46 nginx: > worker process > nobody 25392 0.1 0.0 19760 4116 ? S Mar25 8:58 nginx: > worker process > > # lsof | grep nginx | grep socket > > nginx 19849 root 3w unix 0xffff8102b7574380 > 1677964948 socket […] > += n[i]} print m / (1024 \* 1024 \* 1024)}’ > 12.5018 What makes you think that what you are counting is memory? From here it looks like NODE column, with SIZE/OFF colum omitted for some reason (likely just empty). On a linux system here the output looks like: $ lsof | egrep ‘socket|SIZE’ COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME nginx 30299 mdounin 3u unix 0xffff880224f836c0 0t0 1953927 socket nginx 30299 mdounin 6u unix 0xffff880413ff0380 0t0 1953928 socket nginx 30300 mdounin 6u unix 0xffff880413ff0380 0t0 1953928 socket – Maxim D. > **[nginx: donation](http://nginx.org/en/donation.html)** ---
**Author:** ![MCoder](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/94ad74/32.png) [@MCoder](https://www.ruby-forum.com/u/MCoder)\ **Post date:** [March 29, 2013, 12:15pm UTC](https://www.ruby-forum.com/t/why-socket-for-communication-between-master-and-worker-used-the-so-large-memory/227815/3 "2013-03-29T12:15:12Z")
it’s description in man lsof SIZE, SIZE/OFF, or OFFSET … In other cases, files don’t have true sizes - e.g., sockets, FIFOs, pipes - so lsof displays for their sizes the content amounts it finds in their kernel buffer descriptors (e.g., socket buffer size counts or TCP/IP window sizes.) … 2013/3/29 Maxim D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![MCoder](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/94ad74/32.png) [@MCoder](https://www.ruby-forum.com/u/MCoder)\ **Post date:** [March 29, 2013, 1:15pm UTC](https://www.ruby-forum.com/t/why-socket-for-communication-between-master-and-worker-used-the-so-large-memory/227815/4 "2013-03-29T13:15:58Z")
Hello! On Fri, Mar 29, 2013 at 07:14:49PM +0800, MCoder wrote: > it’s description in man lsof > > SIZE, SIZE/OFF, or OFFSET > … In other cases, files don’t have true sizes - e.g., sockets, > FIFOs, pipes - so lsof displays for their sizes the content amounts it > finds in their kernel buffer descriptors (e.g., socket buffer size counts > or TCP/IP window sizes.) … And what makes you think that: a) Numbers given in SIZE/OFF column on your system for a particular type of object is memory used? Note that e.g. window size is not a memory, as well as socket buffer size. b) The particular column you are counting _is_ SIZE/OFF? > > > just lower than 100. > > > nobody 25392 0.1 0.0 19760 4116 ? S Mar25 8:58 nginx: > > > nginx 25392 nobody 6u unix 0xffff8102dce9dcc0 > > > > nginx 30299 mdounin 6u unix 0xffff880413ff0380 0t0 > > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) – Maxim D. > **[nginx: donation](http://nginx.org/en/donation.html)**