Optimally, yes: for an array process, which most of J is based around,
adequately, probably not: N processors at > 50% usage proficiency is better than 1 at 100%. However, that does NOT mean the task of implementing such is trivial within J. (Albeit IMOHO, it should be so as long as high levels of optimality ar enot required). But to do so and keep it reliable is again a separate question. (I just happen to have a high opinion of the folks at J; ergo, I am in favor of such; but that doe snot address any separate question of Jsoftware internal personnel resources: not a trivial question to address). However, it is a GREAT exercise in learning J to restate an arbitrary J algorithm as a unirform (or non-uniform) partition on a pipeline or other model to ALLOW this to occur ... When you can do this, you WILL understand J AND not "parallel" processing, but rather: computation/mathematics not dependent on serialization. [[Evil leer]]: I leave it as a trivial exercise for those so inclined... On Mon, Sep 8, 2008 at 12:04 PM, Devon McCormick <[EMAIL PROTECTED]> wrote: > As difficult as it may be to manually partition a program for parallel > execution, it's probably more difficult to do it automatically. > > On Mon, Sep 8, 2008 at 11:43 AM, Roy A. Crabtree <[EMAIL PROTECTED] > >wrote: > > > It is an implementation choice if not automatically expedited; > > the J team can address that better than I; > > subpartitioning is not a trivial task manually. > > > > On Mon, Sep 8, 2008 at 7:19 AM, Devon McCormick <[EMAIL PROTECTED]> > > wrote: > > > > > Hi - > > > > > > I don't think this is a J issue. I've been able to make use of both > > cores > > > on my dual-core machine by running separate instances of J - it looks > > like > > > the OS handles this. Try running CPU-intensive tasks on multiple > > versions > > > of J simultaneously. > > > > > > Regards, > > > > > > Devon > > > > > > On 9/8/08, Matthew Brand <[EMAIL PROTECTED]> wrote: > > > > > > > > Hi All, > > > > > > > > I don't know much about the subject but when I look at task manager, > > the > > > > CPU > > > > usage only goes up to 25% on the four core processsor. Is there a > > > > configuration that makes J use all the cores? > > > > > > > > As I say, I don't know much about it but does this mean that it > should > > be > > > > possible: > > > > > > > > >From > > > > >http://en.wikipedia.org/wiki/J_(programming_language)<http://en.wikipedia.org/wiki/J_%28programming_language%29> > <http://en.wikipedia.org/wiki/J_%28programming_language%29> > > <http://en.wikipedia.org/wiki/J_%28programming_language%29> > > > < > > > > http://en.wikipedia.org/wiki/J_(programming_language<http://en.wikipedia.org/wiki/J_%28programming_language> > <http://en.wikipedia.org/wiki/J_%28programming_language> > > <http://en.wikipedia.org/wiki/J_%28programming_language> > > > >: > > > > "Being an array programming > > > > language<http://en.wikipedia.org/wiki/Array_programming_language>, > > > > J is very terse and powerful, and is most suited to > > > > mathematical<http://en.wikipedia.org/wiki/Mathematical>and > > > > statistical <http://en.wikipedia.org/wiki/Statistical> programming, > > > > especially when performing operations on > > > > matrices<http://en.wikipedia.org/wiki/Matrix_(mathematics)<http://en.wikipedia.org/wiki/Matrix_%28mathematics%29> > <http://en.wikipedia.org/wiki/Matrix_%28mathematics%29> > > <http://en.wikipedia.org/wiki/Matrix_%28mathematics%29> > > > >. > > > > J is a MIMD <http://en.wikipedia.org/wiki/MIMD> language." > > > > See: > > > > http://en.wikipedia.org/wiki/MIMD > > > > > ---------------------------------------------------------------------- > > > > 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 > > > > > > > > > > > -- > > Use Reply-To: & thread your email > > after the first: or it may take a while, as > > I get 2000+ emails per day. > > -- > > > > Roy A. Crabtree > > UNC '76 gaa.lifer# > > (For TN contact, email me to set up a confirmed date/time) > > voicemail inbound only > > > > [When you hear/read/see/feel what a y*ehudi plays/writes/sculpts/holds] > > [(n)either violinist {Menuhin} (n)or writer {"The Y*ehudi Principle"} > (n)or > > molder (n)or older] > > [you must strive/think/look/sense all of it, or you will miss the > meanings > > of it all] > > > > [EMAIL PROTECTED] Forwards only to: > > [EMAIL PROTECTED] > > [EMAIL PROTECTED] CC: auto to ^ > > > > http://musings-roy-crabtree.blogspot.com [& others] > > http://www.authorsden.com/royacrabtree > > http://skyscraper.fortunecity.com/activex/720/resume/full.doc > > -- > > (c) RAC/IP, ARE,PRO,PAST > > (Copyright) Roy Andrew Crabtree/In Perpetuity > > All Rights/Reserved Explicitly > > Public Reuse Only > > Profits Always Safe Traded > > ---------------------------------------------------------------------- > > 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 > -- Use Reply-To: & thread your email after the first: or it may take a while, as I get 2000+ emails per day. -- Roy A. Crabtree UNC '76 gaa.lifer# (For TN contact, email me to set up a confirmed date/time) voicemail inbound only [When you hear/read/see/feel what a y*ehudi plays/writes/sculpts/holds] [(n)either violinist {Menuhin} (n)or writer {"The Y*ehudi Principle"} (n)or molder (n)or older] [you must strive/think/look/sense all of it, or you will miss the meanings of it all] [EMAIL PROTECTED] Forwards only to: [EMAIL PROTECTED] [EMAIL PROTECTED] CC: auto to ^ http://musings-roy-crabtree.blogspot.com [& others] http://www.authorsden.com/royacrabtree http://skyscraper.fortunecity.com/activex/720/resume/full.doc -- (c) RAC/IP, ARE,PRO,PAST (Copyright) Roy Andrew Crabtree/In Perpetuity All Rights/Reserved Explicitly Public Reuse Only Profits Always Safe Traded ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
