Problem: VTune Amplifier is Slow on X-Servers with SSH Connection

Intel® VTune™ Amplifier GUI may respond slowly when you run a remote Linux* collection using an X11-forwarding/X-server.


The GUI response may be slow if you use an X-server (for example, Xming*) with SSH on Windows to run the VTune Amplifier GUI on a connected Linux machine and the X-server is slow.


Option 1: Enable Traffic Compression

Compression may help if you are forwarding X sessions on a dial-up or slow network. Turn on the compression with ssh -C or specify Compression yes in your configuration file.

SSH obtains configuration data in the following order:

  • ssh -C command-line option

  • user configuration file (~/.ssh/config)

  • system configuration file (/etc/ssh/ssh_config)


You can explore all available options with man ssh_config.

Option 2: Change Your Encryption Cipher

The default cipher on many systems is triple DES (3DES), which is slower than Blowfish and AES. New versions of OpenSSH default to Blowfish. You can change the cipher to Blowfish with ssh -c blowfish.

Change your configuration file with the Cipher option depending on whether you are connecting with SSH1 or SSH2:

  • for SSH1, use Cipher blowfish

  • for SSH2, use Ciphers blowfish-cbc,aes128-cbc,3des-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc

You may also follow recommendations provided in the documentation to an X-server you are using.

For more complete information about compiler optimizations, see our Optimization Notice.
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