Having too many connections could affect performance ? Post: 302991310

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Special Forums UNIX and Linux Applications Having too many connections could affect performance ? Post 302991310 by Don Cragun on Thursday 9th of February 2017 12:27:53 AM

02-09-2017

Registered User

With what you have told us, the application could be a huge bottleneck, the application server could be a huge bottleneck, the database server could be a huge bottleneck, the database application could be a huge bottleneck, or any combination of the above could be a bottleneck.

Running a filesystem backup while running applications that are using files on that filesystem is VERY likely to affect performance of those applications and of the backup software.

We have seen examples in this forum of text processing code that invokes several processes to produce output for each line read from a file containing a few thousand lines that literally ran for more than 10 hours. When that code was replaced by a single awk script with the output fed into sort, the script ran in less than 10 seconds and produced exactly the same output. Could your application code have a similar issues?

To figure out where you need to look, you first need to know what are your major stumbling blocks. Are you swapping processes in and out a lot? (Need more memory?) Are your disks thrashing? (Put files on different filesystems on different disks/controllers?) Are your CPUs running at 100%? (Badly written code or too many users on your system?) Is your network dropping packets? (Loose connections, faulty routes to servers, failing hardware, etc.?) ... ... ...

Don Cragun

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LEARN ABOUT DEBIAN

imapproxyd

IMAPPROXYD(8)							 IMAP proxy daemon						     IMAPPROXYD(8)

NAME

       imapproxyd - IMAP proxy daemon

SYNOPSIS

       imapproxyd [ -f <config file name> ] [ -p <pidfile name> ]

DESCRIPTION

       This  manual  page documents briefly the imapproxyd command.  This manual page was written for the Debian distribution because the original
       program does not have a manual page.

       UP-ImapProxy proxies IMAP transactions between an IMAP client and an IMAP server. The general idea is that the  client  should  never  know
       that it is not talking to the real IMAP server, but ImapProxy caches server connections.

       ImapProxy was written to compensate for webmail clients that are unable	to maintain persistent connections to an IMAP server. Most webmail
       clients need to log in to an IMAP server for nearly every single transaction; This behaviour can cause tragic performance problems  on  the
       IMAP  server.   ImapProxy  tries  to deal with this problem by leaving server connections open for a short time after a webmail client logs
       out. When the webmail client connects again, ImapProxy will determine if there is a cached connection available and reuse it if possible.

FILES

       By default, UP-ImapProxy reads /etc/imapproxy.conf on startup.  This can be changed by using the -f option

       Unless foreground_mode has been enabled, UP-ImapProxy will write its PID to to a PID-file. It defaults to /var/run/imapproxy.pid,  but  can
       be overridden with the -p option

SEE ALSO

       pimpstat(8),

AUTHOR

       This manual page was written by Jose Luis Tallon <jltallon@adv-solutions.net>, for the Debian GNU/Linux system (but may be used by others).

Dave McMurtrie							   Mar 12, 2004 						     IMAPPROXYD(8)