Subject: conventional versus direct SCF

From: "Moshe Olshansky" <[email-masked]>
Date: Thu, 24 Aug 95 17:59:34 IST

Dear netters!
About a month ago someone mentioned that conventional SCF is faster (the total
wallclock time) than the direct one only for systems with 100 - 150 basis
functions.  This looks strange to me - isn't it true that for a large number
of ERIs both the time needed to compute them or to read them from the disk is
almost a linear function of their number,  so one method should be always
faster than the other (as soon as the number of basis functions is large enough)?
Could that person please explain his/her claim (either to CCL or directly to me)?

Thank you in advance
Moshe Olshansky
IBM Israel Science & Technology
Haifa,  Israel
e-mail: [email-masked]  or  [email-masked]