This is a re-send of a message I sent earlier today but which seems not to have appeared on the list - well, I have changed it a bit:
On Tuesday 07 April 2015 23:19:18 I wrote: > On Tuesday 07 April 2015 15:02:36 walt wrote: > > On 04/07/2015 02:48 PM, Peter Humphrey wrote: > > > On Tuesday 07 April 2015 22:24:38 Peter Humphrey wrote: > > >> $ cat make.conf # I made a local copy and removed a lot of comments > > >> #CFLAGS="-O2 -march=core2 -pipe" [1] > > > > > > --->8 > > > > > >> [1] This bothers me. Various docs tell me to specify march=corei7, > > >> but > > >> this is an i5 CPU. Could this be my problem? > > > > Any reason you don't want to use march=native? > > Not that I can think of now. I'll try it - thanks, both of you. Countless CPU cycles later, I have now reinstalled my complete system with -march=native. It took several iterations. Meanwhile,I had another problem to keep me amused - KMail decided I'd deleted the folder into which it receives all inbound mail. I hadn't, of course, but suddenly my 13000 mails were gone - vanished. So I had to create a new user and import them all from the previous day's backup. Tedium - yawn... Still, all my filters have gone, and I'll have to define new ones as I need them. Oh well, I suppose it's about time I cleaned them out. Back to the original theme, I'd been experimenting with -j and -l make options, and I suspect that was my real problem. I finished up with "-j -l20" on this i5 box, with startling results - 56 emerges in parallel for instance. I suspect that my problem stemmed from this. All now seems stable so far with -j12 and no -l specified. Satisfactory CPU utilisation and the all-important stability. So no, perl isn't broken :) -- Rgds Peter
