Array languages are easier to spread over multiple processors. And J applications would probably extend to multiple processors with no or very little work. But each core is a scalar processor. The J engine would have to divide the vector and operations that can be parallelized into scalar tasks for each core. Not an easy task, as can be seen by all the complexities required to support multiple cores for scalar languages like C.
On Fri, Feb 12, 2010 at 9:41 AM, Matthew Brand <[email protected]>wrote: > It only appears to use one core at a time so on dual core, CPU usage > reaches > 50%. > > Would calculations take half as long if it used both? I suppose it depends > on what the calculation is. But isn't one of the touted benefits of array > based languages meant to be ease of parrallisation (now I know I must have > spelt that incorrectly!). > > On 12 February 2010 16:28, Devon McCormick <[email protected]> wrote: > > > Based on my experience with two cores, the OS seems smart enough to use > the > > other core for a separate J process if one core is busy. > > > > On Fri, Feb 12, 2010 at 11:19 AM, Raul Miller <[email protected]> > > wrote: > > > > > On Fri, Feb 12, 2010 at 11:09 AM, Jan Jacobs <[email protected] > > > >wrote: > > > > > > > ls, > > > > I want to upgrade my PC from single core to a quad core version, with > > 4GB > > > > RAM. How does J scale with number of processors? Has J ways of > > > configuring > > > > a > > > > quad core system to support this? When it doesn't, is it worthwhile > to > > > port > > > > the application to 4 separate communicating J sessions or are there > > other > > > > solutions? Currently I use J504 and J64 Windows XP 64. > > > > Thanks in advance for your help. > > > > > > > > > > Current versions of J use only one core per J process. > > > > > > FYI, > > > > > > -- > > > Raul > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > > > > > > -- > > Devon McCormick, CFA > > ^me^ at acm. > > org is my > > preferred e-mail > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
