User Tools

Site Tools


freshs:faq

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
freshs:faq [2015/09/02 09:41]
josh [Code works on my desktop, but has problems or scales badly on my cluster]
freshs:faq [2016/02/25 10:30] (current)
josh [Do I want to use FFS, PERM_FFS or SPRES?]
Line 10: Line 10:
 ===== Do I want to use FFS, PERM_FFS or SPRES? ===== ===== Do I want to use FFS, PERM_FFS or SPRES? =====
  
-In the FRESHS code, "​ffs"​ refers to the direct FFS algortihm, and "​perm_ffs"​ refers to an optimisation of this (Pruned Enriched Rosenbluth Method) which aims to improve the evenness of sampling. ​ The only reason to retain the original "​algorithm = ffs" choice is that "​perm_ffs"​ increases the calculation by the server, and also the server-DB communication load, which might be a problem for runs having very large DBs.+In the FRESHS code, "​ffs"​ refers to the direct FFS algortihm, and "​perm_ffs"​ refers to an optimisation of this (Flat Histogram ​Pruned Enriched Rosenbluth Method, or flatPERM) which aims to improve the evenness of sampling. ​ The only reason to retain the original "​algorithm = ffs" choice is that "​perm_ffs"​ increases the calculation by the server, and also the server-DB communication load, which might be a problem for runs having very large DBs.
  
 SPRES is appropriate for full nonequilibrium calculations,​ where ffs and perm_ffs are only appropriate for nonequilibrium systems which have time-stationary behaviour. ​ Needless to say, SPRES calculations are typically more expensive. SPRES is appropriate for full nonequilibrium calculations,​ where ffs and perm_ffs are only appropriate for nonequilibrium systems which have time-stationary behaviour. ​ Needless to say, SPRES calculations are typically more expensive.
freshs/faq.txt ยท Last modified: 2016/02/25 10:30 by josh