Greetings! Santiago Vila <sanv...@unex.es> writes:
> On Sun, 2 Oct 2016, Camm Maguire wrote: > >> Greetings! I just wanted to keep you abreast of the latest upload. >> I've put in an improvement which I hope will allow better use of the >> ram available without running into the fork/exec faults we had seen in >> some configurations. This does not address the question of 'how much >> memory should we attempt to make use of', but you may find this upload >> more robust nonetheless. GCL_MEM_MULTIPLE defaults back to 1.0 from >> 0.85 without apparent issue. >> >> Feedback appreciated. > > Hello. > > I finally tested maxima_5.38.1-2 today. > Thanks! > On a machine with 6GB RAM and 4 GB swap, memory usage was about > 7500 MB (1500 MB more than the available RAM). > > On a machine with 3GB RAM and 4 GB swap, memory usage was about > 3700 MB (700 MB more than the available RAM). > > I'm still measuring memory usage with Committed_AS, by taking note of > its value during the build and substracting the value before the build > starts. > > In your previous email, you suggest that I don't use Committed_AS > to measure memory usage, but something else. > Because the linux docs say this is an anticipated worst case guess, not the amount of memory in use. > I'm not sure what else I could use instead which is better than > Committed_AS, and I fear that the more memory I have available, the > more memory would maxima use as well, just as it happens with > Committed_AS, so are you sure that using something else other > than Committed_AS would really fix my problem? If you use the variables I output in my post, I think you will find that the build does not swap. > > Do you have a suggestion about which other parameter in /proc/meminfo > would be more suitable than Committed_AS? These were the variables I output in my sample build. > > Maybe this Committed_AS value being higher than the available RAM is > "normal and expected", but the way I see it, it seems part of a > general problem called "overcommit". > Indeed, all unices nowadays do this. > The question would be: How much overcommit should we reasonably expect > from a package when it's being built? > I think it is reasonable that a program make use of the available ram as long as it stays out of swap. Take care, > [ I still have to read your previous email in detail, this is just a > first reply to tell my experience with maxima_5.38.1-2 ] > > Thanks. > > > > -- Camm Maguire c...@maguirefamily.org ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah
