-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dear Chang,
Without being aware of the various means to parallelise a computer program I would be surprised if refmac5 was parallelised for MacOSX but not for Linux, although I am sure Garib would correct me if I was wrong. Maybe you only have the impression that refmac5 uses several cores on MacOSX? Regards, Tim On 12/17/2013 01:05 PM, Chang Qing wrote: > Thanks so much. XDS program is a very good example for multi-core > cpu processing. I love it. I also have a macbook. Though a > notebook, it often runs CCP4 program more quickly than on desktop > computer. The programs, for example refmac5, seem to use multi-core > on OSX and single core on linux. Is that mean CCP4 runs more > efficiently on OSX than linux? > > Best > > Chang > > > 2013/12/17 Tim Gruene <t...@shelx.uni-ac.gwdg.de> > > Dear Chang, > > this is hardly a matter of configuration but a question of > programming (meaning you cannot change it unless you modify the > source code and recompile). You can run a program of which you know > it is parallelised, e.g. XDS, shelxl, shelxd, and check with the > command 'top' that your %CPU is about 400%. > > You can also get the program i7z for more detailed information > about the status of your CPUs. > > Phaser is parallelised, but I dare say it is rather an exception > within the ccp4 suite. > > So all you can do is encourage the developers of cpu-demanding > programs to spend time on parallelising their code - XDS is one of > the most impressive examples of how much this can be worth in the > context of acceptance and propagation. > > Best, Tim > > On 12/17/2013 02:51 AM, Chang Qing wrote: >>>> Dear all >>>> >>>> I just installed CCP4 6.4 on Ubuntu 12.1. The program can >>>> work. I found it just used 1 processor instead of 4( Intel >>>> i5) for data solving. Does anyone know how to config CPU so >>>> that all processors can be used. >>>> >>>> Thanks >>>> >>>> Chang >>>> > >> > - -- - -- Dr Tim Gruene Institut fuer anorganische Chemie Tammannstr. 4 D-37077 Goettingen GPG Key ID = A46BEE1A -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Icedove - http://www.enigmail.net/ iD8DBQFSsEI+UxlJ7aRr7hoRAiIiAKDCWKpTFw1nin+BCAdXW7cLMjKq7QCg7EU3 MiuWuXad/KGgBLd6Q8aN0W0= =RiQ5 -----END PGP SIGNATURE-----
