It was thus said that the Great Mick Sheppard once stated: > Hi, > > Just to throw a slight spanner in the works here. My understanding of > 'open files' is open file descriptors. As far as a file descriptor is > concerned there is no real difference between a physical file on disk > and a socket (network connection). So eliminating physical files, whilst > it might get you a little more headroom, is unlikely to solve the > problem. Yes and no. Yes, sockets are considered "opened files" and do count against the open file limit, that limit is *per process*, not *system wide*. I just checked one of our main web servers (serving up a few hundred sites) and found only three active sockets per process: 1. the listening socket on port 80, waiting for a connection 2. the listening socket on port 443, waiting for a connection 3. an actual connection to a client The main root process only has the first two sockets open. If you have Apache configured to have at a minimum 30 spare servers, no one Apache process will have 30 sockets open---sockets just don't work that way. What it does mean is you have at least 31 apache processes running, one as root (to bind to the proper ports [1]) and 30 ready to service a request, so at most, any Apache process will have one socket per Listen statement, and one socket only when actually processing a request. So, for example, let's say you have the following Apache configuration: Listen *:80 StartServers 100 MinSpareServers 100 MaxSpareServers 900 ServerLimit 1000 MaxClients 1000 MaxRequestsPerChild 4000 CustomLog access_log ErrorLog error_log All your apache processes would have only seven files open (eight if serving a request), and they would look something like: 0 -> /dev/null (STDIN) 1 -> /dev/null (STDOUT) 2 -> error_log (STDERR) 3 -> listening socket 4 -> pipe (for CGI communications) 5 -> pipe (for CGI communications) 6 -> error_log 7 -> access_log The real concern are log files, not the number of connections in the Apache configuration. The only way the number of connections might be a consideration is if you are using the threading MPM, where each thread (in a single process) gets a connection. > Remember that as you add connectivity to databases that this will > increase the number of sockets, and therefore open files, used for each > page served. True, but you really need to look at this at the process level. -spc --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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