Dear Tim Yes, it is just my impression. I don't know how to test it. As now most of computers have multi-core CPU, I really hope CCP4 programs can be paralleled. Thank you so much for answering my questions.
All my best Chang 2013/12/17 Tim Gruene <t...@shelx.uni-ac.gwdg.de> > -----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----- >
