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

scriptor

SCRIPTOR(1p)															      SCRIPTOR(1p)

NAME

       scriptor - Perl script to send commands to a smart card

SYNOPSIS

       scriptor [-h] [-r reader] [-p protocol] [file]

DESCRIPTION

       This manual page documents briefly the scriptor command.

       scriptor is a program that sends commands to a smart card using a batch file or stdin.

OPTIONS

       A description of options is included below.

       -h     Show summary of options.

       -r reader
	      Use the indicated reader. By default the first PC/SC reader is used.

       -p protocol
	      Use the indicated protocol. Accepted values are T=0 and T=1. By default T=0 is used.

       file   Use the file instead of stdin to read commands (APDUs)

	      The commands are of the form:
	       CLA INS P1 P2 Lc [data] [le]
	       reset
	       # comment

	      Example:

	       # reset the card
	       reset

	       # Select MF 3F00
	       A0 A4 00 00 02 3F 00

	       # Get Reponse
	       # 17 is the value of second SW from the previous command
	       A0 C0 00 00 17

	       # Select DF Telecom(7F10)
	       A0 A4 00 00 02 7F 10

	       # Get Response
	       A0 C0 00 00 17

	       # Select EF_ADN(6F3A) (Abbreviated Dialing Numbers)
	       A0 A4 00 00 02 6F 3A

	       # Get Reponse
	       A0 C0 00 00 0F

SEE ALSO

       pcscd(8),gscriptor(1)

AUTHOR

       This manual page was written by Ludovic Rousseau <rousseau@debian.org>, for the Debian GNU/Linux system (but may be used by others).

								 octobre 17, 2003						      SCRIPTOR(1p)