Hi,
I'm trying to track down a sporadic delay problem that's giving us
some grief. I know very little about the inner workings of WSGI/
mod_wsgi, and wasn't quite sure what to make of an strace log I made
of the Apache instance that was handling a POST to a Moin wiki (same
machine as the client). From the client's POV - verified with strace
- the POST request went out at 11:16:10, and the response was received
at 11:16:21.
21827 11:16:10.042475 connect(12, {sa_family=AF_FILE, path="/var/run/
apache2/wsgi.11746.39.2.sock"}, 110) = 0
21827 11:16:10.042713 write(12, "P\5\0\0\0\0\0\0D
\0\0\0\0\0\0\0GATEWAY_INTERFAC"..., 1368 <unfinished ...>
21827 11:16:10.042812 <... write resumed> ) = 1368
21827 11:16:10.042874 read(12, <unfinished ...>
21827 11:16:10.123919 <... read resumed> "Status: 0 Continue\r\n\r\n",
8000) = 22
21827 11:16:10.124037 fcntl(12, F_GETFL <unfinished ...>
21827 11:16:10.124120 <... fcntl resumed> ) = 0x2 (flags O_RDWR)
21827 11:16:10.124201 fcntl(12, F_SETFL, O_RDWR|O_NONBLOCK
<unfinished ...>
21827 11:16:10.124344 <... fcntl resumed> ) = 0
21827 11:16:10.124432 write(12, "action=edit&ticket=004bec17b5.4d"...,
2290 <unfinished ...>
21827 11:16:10.124518 <... write resumed> ) = 2290
21827 11:16:10.124601 fcntl(12, F_GETFL <unfinished ...>
21827 11:16:10.124688 <... fcntl resumed> ) = 0x802 (flags O_RDWR|
O_NONBLOCK)
21827 11:16:10.124734 fcntl(12, F_SETFL, O_RDWR) = 0
21827 11:16:10.124810 shutdown(12, 1 /* send */) = 0
21827 11:16:10.124930 read(12, <unfinished ...>
21827 11:16:21.917191 <... read resumed> "Status: 200 OK\r\nVary:
Cookie, Us"..., 8000) = 2125
Due to the successful shutdown(), I would expect the client to receive
the response at that time, but as mentioned, it doesn't receive it
until the follow-on read unblocks.
Any ideas what's going on?
TIA.
Mark.
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