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netstat -ntp

Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name 
tcp 8216172 0 127.0.0.1:9503 127.0.0.1:47654 ESTABLISHED 34390/python 
tcp 0 4189632 127.0.0.1:47686 127.0.0.1:9503 ESTABLISHED 34379/python 
tcp 8203139 0 127.0.0.1:9503 127.0.0.1:47666 ESTABLISHED 34390/python 
tcp 8179744 0 127.0.0.1:9503 127.0.0.1:47686 ESTABLISHED 34390/python 

I have read the answer posted here but still have some doubts about if the program is having queues stacked on send or receive queues. For eg. what is happening in below two lines of netstat -ntp output ? is the processId 34390 is getting queued data while sending or receiving and on which port number the queue is occuring on ?

tcp 8216172 0 127.0.0.1:9503 127.0.0.1:47654 ESTABLISHED 34390/python
tcp 0 4189632 127.0.0.1:47686 127.0.0.1:9503 ESTABLISHED 34379/python

tcp 8216172 0 127.0.0.1:9503 127.0.0.1:47654 ESTABLISHED 34390/python

means that process 34390 has a connection open, between port 9503 on the local host, and port 47654 on the local host, and that 8216172 bytes of data have been received by the kernel on port 9503 but haven’t yet been copied by the process.

tcp 0 4189632 127.0.0.1:47686 127.0.0.1:9503 ESTABLISHED 34379/python

means that process 34379 has a connection open, between port 47686 on the local host, and port 9503 on the local host, and that 4189632 bytes of data have been sent from port 47686 but not acknowledged yet (so they’re still in the TCP window).