Comment #3 on issue 62 by dmitry.isaikin: Patch: connection queue
simplification
http://code.google.com/p/memcached/issues/detail?id=62
Yes, in case of many simultaneous connections.
Client connections is accepted by the listening thread. Pipe is used only
for resend
client information to the worker thread. Pipe has a limited capacity (4096
bytes on
almost all systems; 65536 bytes on Linux 2.6). Write to pipe blocks
listening thread
only if pipe is full (sizeof(CQ_ITEM) == 20, 204 items not readed by worker
thread;
or 3276 on Linux 2.6). Current memcached would blocks in case of 4096 not
readed by
worker thread items.
Pipes can work in non-blocking mode (if O_NONBLOCK is enabled). In this case
memcached may reject connections if write would block.
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