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I just thought I would pass on a trick that Paul Adams and Nigel Moriarty pointed out recently. That was in the context of the Phenix interface, but it applies equally to ccp4i. If you've ever tried to run ccp4i over the network using ssh and X forwarding, you might have been discouraged by how slow it becomes, particularly with anything less than the fastest connections. I had almost given up on running ccp4i when connecting from home via broadband (2Mb connection, which is fast enough for most other things). Nigel looked into this problem and found out that the speed of X forwarding can be increased dramatically by turning on compression when running ssh (using the -C flag). Perhaps this is no news to many of you, but I had certainly missed that flag in the documentation. As an illustration of the size of the effect, it takes 260 seconds to open the Phaser molecular replacement GUI without the -C flag on my home connection, but only 33 seconds with the -C flag. Still slow, but bearable. On either an iBook running OSX 10.3 or a laptop running Fedora Core 4, the command I use to connect is: ssh -X -C [EMAIL PROTECTED] The -X flag may not be required, depending on the setup, but says to turn on X forwarding. Paul Adams says that this doesn't work for some connections, in which case replacing "-X" by "-Y" might work. This turns off some security checks and may get around firewall issues. Presumably there are equivalent flags when connecting from non-Unix-based machines, but I don't have an X client on my Windows machines; perhaps someone else can comment. -- Randy J. Read Department of Haematology, University of Cambridge Cambridge Institute for Medical Research Tel: + 44 1223 336500 Wellcome Trust/MRC Building Fax: + 44 1223 336827 Hills Road E-mail: [EMAIL PROTECTED] Cambridge CB2 2XY, U.K. www-structmed.cimr.cam.ac.uk
